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From 624e057827435de39274c34e20c2d937cb9d4ac3 Mon Sep 17 00:00:00 2001
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From: Peter Robinson <pbrobinson@gmail.com>
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Date: Thu, 31 May 2018 19:08:12 +0100
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Subject: [PATCH] bcm2835: cpufreq: add CPU frequency control driver
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Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
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---
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 arch/arm/boot/dts/bcm2835-rpi.dtsi |   7 ++
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 arch/arm/boot/dts/bcm2837.dtsi     |  33 +++++++
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 drivers/clk/bcm/Kconfig            |   8 ++
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 drivers/clk/bcm/Makefile           |   1 +
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 drivers/clk/bcm/clk-raspberrypi.c  | 138 +++++++++++++++++++++++++++++
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 5 files changed, 187 insertions(+)
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 create mode 100644 drivers/clk/bcm/clk-raspberrypi.c
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diff --git a/arch/arm/boot/dts/bcm2835-rpi.dtsi b/arch/arm/boot/dts/bcm2835-rpi.dtsi
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index 6c3cfaa77f3d..e6d1627ec421 100644
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--- a/arch/arm/boot/dts/bcm2835-rpi.dtsi
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+++ b/arch/arm/boot/dts/bcm2835-rpi.dtsi
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@@ -35,6 +35,13 @@
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 			reg = <0x7e00b840 0x3c>;
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 			interrupts = <0 2>;
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 		};
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+
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+		arm_clk: arm_clk {
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+			compatible = "raspberrypi,bcm2835-cpu";
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+			clocks = <&clocks BCM2835_CLOCK_VPU>;
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+			#clock-cells = <0>;
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+			clock-output-names = "arm";
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+		};
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 	};
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 };
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diff --git a/arch/arm/boot/dts/bcm2837.dtsi b/arch/arm/boot/dts/bcm2837.dtsi
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index 7704bb029605..c24176282a1f 100644
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--- a/arch/arm/boot/dts/bcm2837.dtsi
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+++ b/arch/arm/boot/dts/bcm2837.dtsi
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@@ -38,6 +38,9 @@
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 			reg = <0>;
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 			enable-method = "spin-table";
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 			cpu-release-addr = <0x0 0x000000d8>;
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+			clocks = <&arm_clk>;
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+			clock-names = "cpu";
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+			operating-points-v2 = <&cpu0_opp_table>;
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 		};
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 		cpu1: cpu@1 {
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@@ -46,6 +49,9 @@
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 			reg = <1>;
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 			enable-method = "spin-table";
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 			cpu-release-addr = <0x0 0x000000e0>;
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+			clocks = <&arm_clk>;
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+			clock-names = "cpu";
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+			operating-points-v2 = <&cpu0_opp_table>;
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 		};
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 		cpu2: cpu@2 {
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@@ -54,6 +60,9 @@
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 			reg = <2>;
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 			enable-method = "spin-table";
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 			cpu-release-addr = <0x0 0x000000e8>;
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+			clocks = <&arm_clk>;
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+			clock-names = "cpu";
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+			operating-points-v2 = <&cpu0_opp_table>;
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 		};
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 		cpu3: cpu@3 {
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@@ -62,6 +71,30 @@
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 			reg = <3>;
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 			enable-method = "spin-table";
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 			cpu-release-addr = <0x0 0x000000f0>;
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+			clocks = <&arm_clk>;
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+			clock-names = "cpu";
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+			operating-points-v2 = <&cpu0_opp_table>;
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+		};
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+	};
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+
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+	cpu0_opp_table: opp_table0 {
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+		compatible = "operating-points-v2";
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+		opp-shared;
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+
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+		opp@600000000 {
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+			opp-hz = /bits/ 64 <600000000>;
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+			clock-latency-ns = <355000>;
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+			opp-suspend;
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+		};
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+
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+		opp@900000000 {
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+			opp-hz = /bits/ 64 <900000000>;
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+			clock-latency-ns = <355000>;
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+		};
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+
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+		opp@1200000000 {
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+			opp-hz = /bits/ 64 <1200000000>;
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+			clock-latency-ns = <355000>;
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 		};
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 	};
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 };
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diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
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index 4c4bd85f707c..e40bd19da22b 100644
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--- a/drivers/clk/bcm/Kconfig
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+++ b/drivers/clk/bcm/Kconfig
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@@ -63,3 +63,11 @@ config CLK_BCM_SR
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 	default ARCH_BCM_IPROC
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 	help
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 	  Enable common clock framework support for the Broadcom Stingray SoC
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+
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+config CLK_RASPBERRYPI_CPU
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+	bool "Raspberry Pi CPU clock driver"
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+	depends on ARCH_BCM2835 || (COMPILE_TEST && OF)
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+	depends on RASPBERRYPI_FIRMWARE=y
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+	help
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+	  This enables support for the RPi CPU clock which can be adjusted
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+	  via the RPi firmware.
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diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
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index 002661d39128..a028b0a90b6e 100644
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--- a/drivers/clk/bcm/Makefile
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+++ b/drivers/clk/bcm/Makefile
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@@ -8,6 +8,7 @@ obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-a
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 obj-$(CONFIG_ARCH_BCM2835)	+= clk-bcm2835.o
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 obj-$(CONFIG_ARCH_BCM2835)	+= clk-bcm2835-aux.o
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 obj-$(CONFIG_ARCH_BCM_53573)	+= clk-bcm53573-ilp.o
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+obj-$(CONFIG_CLK_RASPBERRYPI_CPU)	+= clk-raspberrypi.o
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 obj-$(CONFIG_CLK_BCM_CYGNUS)	+= clk-cygnus.o
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 obj-$(CONFIG_CLK_BCM_HR2)	+= clk-hr2.o
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 obj-$(CONFIG_CLK_BCM_NSP)	+= clk-nsp.o
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diff --git a/drivers/clk/bcm/clk-raspberrypi.c b/drivers/clk/bcm/clk-raspberrypi.c
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new file mode 100644
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index 000000000000..046efc822a59
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--- /dev/null
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+++ b/drivers/clk/bcm/clk-raspberrypi.c
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@@ -0,0 +1,138 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ * Raspberry Pi CPU clock driver
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+ *
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+ * Copyright (C) 2018 Stefan Wahren <stefan.wahren@i2se.com>
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+ */
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+
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+#include <linux/clk.h>
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+#include <linux/clk-provider.h>
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+#include <linux/device.h>
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+#include <linux/err.h>
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+#include <linux/module.h>
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+#include <linux/of_device.h>
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+#include <linux/platform_device.h>
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+#include <linux/slab.h>
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+#include <soc/bcm2835/raspberrypi-firmware.h>
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+
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+#define VCMSG_ID_ARM_CLOCK 0x000000003	/* Clock/Voltage ID's */
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+
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+struct rpi_cpu_clkgen {
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+	struct clk_hw hw;
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+	struct rpi_firmware *fw;
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+};
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+
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+/* tag part of the message */
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+struct prop {
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+       u32 id;			/* the ID of the clock/voltage to get or set */
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+       u32 val;			/* the value (e.g. rate (in Hz)) to set */
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+} __packed;
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+
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+static int rpi_cpu_clock_property(struct rpi_firmware *fw, u32 tag, u32 *val)
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+{
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+	int ret;
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+	struct prop msg = {
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+		.id = VCMSG_ID_ARM_CLOCK,
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+		.val = *val,
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+	};
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+
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+	ret = rpi_firmware_property(fw, tag, &msg, sizeof(msg));
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+	if (ret)
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+		return ret;
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+
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+	*val = msg.val;
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+
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+	return 0;
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+}
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+
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+static unsigned long rpi_cpu_get_rate(struct clk_hw *hw,
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+				      unsigned long parent_rate)
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+{
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+	struct rpi_cpu_clkgen *cpu = container_of(hw, struct rpi_cpu_clkgen, hw);
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+	u32 rate = 0;
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+
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+	rpi_cpu_clock_property(cpu->fw, RPI_FIRMWARE_GET_CLOCK_RATE, &rate;;
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+
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+	return rate;
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+}
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+
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+static long rpi_cpu_round_rate(struct clk_hw *hw, unsigned long rate,
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+				     unsigned long *parent_rate)
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+{
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+	return rate;
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+}
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+
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+static int rpi_cpu_set_rate(struct clk_hw *hw, unsigned long rate,
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+			    unsigned long parent_rate)
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+{
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+	struct rpi_cpu_clkgen *cpu = container_of(hw, struct rpi_cpu_clkgen, hw);
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+	u32 new_rate = rate;
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+
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+	return rpi_cpu_clock_property(cpu->fw, RPI_FIRMWARE_SET_CLOCK_RATE,
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+				      &new_rate);
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+}
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+
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+static const struct clk_ops rpi_cpu_ops = {
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+	.recalc_rate = rpi_cpu_get_rate,
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+	.round_rate = rpi_cpu_round_rate,
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+	.set_rate = rpi_cpu_set_rate,
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+};
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+
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+static int rpi_cpu_probe(struct platform_device *pdev)
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+{
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+	struct device *dev = &pdev->dev;
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+	struct device_node *fw_node;
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+	struct rpi_cpu_clkgen *cpu;
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+	struct clk_init_data *init;
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+	int ret;
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+
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+	cpu = devm_kzalloc(dev, sizeof(*cpu), GFP_KERNEL);
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+	if (!cpu)
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+		return -ENOMEM;
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+
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+	init = devm_kzalloc(dev, sizeof(*init), GFP_KERNEL);
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+	if (!init)
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+		return -ENOMEM;
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+
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+	fw_node = of_find_compatible_node(NULL, NULL,
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+					  "raspberrypi,bcm2835-firmware");
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+	if (!fw_node) {
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+		dev_err(dev, "Missing firmware node\n");
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+		return -ENOENT;
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+	}
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+
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+	cpu->fw = rpi_firmware_get(fw_node);
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+	of_node_put(fw_node);
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+	if (!cpu->fw)
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+		return -EPROBE_DEFER;
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+
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+	init->name = dev->of_node->name;
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+	init->ops = &rpi_cpu_ops;
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+
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+	cpu->hw.init = init;
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+	ret = devm_clk_hw_register(dev, &cpu->hw);
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+	if (ret)
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+		return ret;
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+
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+	return of_clk_add_hw_provider(dev->of_node, of_clk_hw_simple_get,
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+				      &cpu->hw);
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+}
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+
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+static const struct of_device_id rpi_cpu_of_match[] = {
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+	{ .compatible = "raspberrypi,bcm2835-cpu", },
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+	{},
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+};
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+MODULE_DEVICE_TABLE(of, rpi_cpu_of_match);
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+
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+static struct platform_driver rpi_cpu_driver = {
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+	.driver = {
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+		.name = "raspberrypi-cpu",
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+		.of_match_table = rpi_cpu_of_match,
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+	},
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+	.probe		= rpi_cpu_probe,
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+};
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+builtin_platform_driver(rpi_cpu_driver);
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+
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+MODULE_AUTHOR("Stefan Wahren <stefan.wahren@i2se.com>");
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+MODULE_DESCRIPTION("Raspberry Pi CPU clock driver");
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+MODULE_LICENSE("GPL v2");
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-- 
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2.17.0
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From 40a82f71737891581dcbe45331d15a29dd3e7805 Mon Sep 17 00:00:00 2001
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From: Peter Robinson <pbrobinson@gmail.com>
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Date: Mon, 4 Jun 2018 09:14:10 +0100
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Subject: [PATCH 7/7] add 1.4 ghz OPP for the 3B+
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Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
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---
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 arch/arm/boot/dts/bcm2837-rpi-3-b-plus.dts | 7 +++++++
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 1 file changed, 7 insertions(+)
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diff --git a/arch/arm/boot/dts/bcm2837-rpi-3-b-plus.dts b/arch/arm/boot/dts/bcm2837-rpi-3-b-plus.dts
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index 4adb85e66be3..aaefb078f391 100644
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--- a/arch/arm/boot/dts/bcm2837-rpi-3-b-plus.dts
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+++ b/arch/arm/boot/dts/bcm2837-rpi-3-b-plus.dts
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@@ -106,3 +106,10 @@
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 	pinctrl-0 = <&uart1_gpio14>;
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 	status = "okay";
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 };
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+
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+&cpu0_opp_table {
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+	opp@1400000000 {
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+		opp-hz = /bits/ 64 <1400000000>;
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+		clock-latency-ns = <355000>;
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+	};
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+};
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-- 
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2.17.1
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From d00bd46b40001d3500b8a7207dcfe1d66600e47e Mon Sep 17 00:00:00 2001
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From: Stefan Wahren <stefan.wahren@i2se.com>
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Date: Wed, 26 Sep 2018 21:13:22 +0200
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Subject: [PATCH] ARM: bcm2837: Use CPU0 as cooling device
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Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
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---
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 arch/arm/boot/dts/bcm2837.dtsi | 25 +++++++++++++++++++++++++
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 arch/arm/boot/dts/bcm283x.dtsi |  2 +-
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 2 files changed, 26 insertions(+), 1 deletion(-)
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diff --git a/arch/arm/boot/dts/bcm2837.dtsi b/arch/arm/boot/dts/bcm2837.dtsi
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index 9cfc553..1590d94 100644
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--- a/arch/arm/boot/dts/bcm2837.dtsi
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+++ b/arch/arm/boot/dts/bcm2837.dtsi
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@@ -1,4 +1,5 @@
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 #include "bcm283x.dtsi"
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+#include <dt-bindings/thermal/thermal.h>
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 / {
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 	compatible = "brcm,bcm2837";
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@@ -47,6 +48,7 @@
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 			clocks = <&arm_clk>;
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 			clock-names = "cpu";
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 			operating-points-v2 = <&cpu0_opp_table>;
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+			#cooling-cells = <2>;
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 		};
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 		cpu1: cpu@1 {
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@@ -58,6 +60,7 @@
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 			clocks = <&arm_clk>;
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 			clock-names = "cpu";
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 			operating-points-v2 = <&cpu0_opp_table>;
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+			#cooling-cells = <2>;
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 		};
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 		cpu2: cpu@2 {
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@@ -69,6 +72,7 @@
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 			clocks = <&arm_clk>;
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 			clock-names = "cpu";
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 			operating-points-v2 = <&cpu0_opp_table>;
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+			#cooling-cells = <2>;
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 		};
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 		cpu3: cpu@3 {
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@@ -80,6 +84,7 @@
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 			clocks = <&arm_clk>;
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 			clock-names = "cpu";
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 			operating-points-v2 = <&cpu0_opp_table>;
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+			#cooling-cells = <2>;
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 		};
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 	};
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@@ -117,6 +122,26 @@
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 &cpu_thermal {
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 	coefficients = <(-538)	412000>;
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+
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+	trips {
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+		cpu_alert0: cpu-alert0 {
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+			temperature	= <70000>;
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+			hysteresis	= <0>;
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+			type		= "passive";
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+		};
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+	};
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+
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+	cooling-maps {
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+		map0 {
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+			trip = <&cpu_alert0>;
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+			cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
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+		};
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+
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+		map1 {
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+			trip = <&cpu_crit>;
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+			cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
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+		};
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+	};
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 };
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 /* enable thermal sensor with the correct compatible property set */
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diff --git a/arch/arm/boot/dts/bcm283x.dtsi b/arch/arm/boot/dts/bcm283x.dtsi
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index 31b2964..2def068 100644
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--- a/arch/arm/boot/dts/bcm283x.dtsi
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+++ b/arch/arm/boot/dts/bcm283x.dtsi
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@@ -38,7 +38,7 @@
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 			thermal-sensors = <&thermal>;
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 			trips {
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-				cpu-crit {
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+				cpu_crit: cpu-crit {
Pablo Greco ee0ebe
 					temperature	= <90000>;
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 					hysteresis	= <0>;
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 					type		= "critical";
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-- 
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2.7.4