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From: Stefan Wahren <wahrenst@gmx.net>
To: Zhang Rui <rui.zhang@intel.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Amit Kucheria <amit.kucheria@verdurent.com>,
Rob Herring <robh+dt@kernel.org>, Mark Rutland <mark.rutland@arm.com>,
Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
Florian Fainelli <f.fainelli@gmail.com>,
Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>
Subject: [PATCH V3 1/4] dt-bindings: Add Broadcom AVS RO thermal
Date: Tue, 7 Jan 2020 19:15:54 +0100
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Cc: devicetree@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com,
Stefan Wahren <wahrenst@gmx.net>, linux-arm-kernel@lists.infradead.org,
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Since the BCM2711 doesn't have a AVS TMON block, the thermal information
must be retrieved from the AVS ring oscillator block. This block is part
of the AVS monitor which contains a bunch of raw sensors.
Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
.../bindings/thermal/brcm,avs-ro-thermal.yaml | 45 ++++++++++++++++++++++
1 file changed, 45 insertions(+)
create mode 100644 Documentation/devicetree/bindings/thermal/brcm,avs-ro-thermal.yaml
--
2.7.4
diff --git a/Documentation/devicetree/bindings/thermal/brcm,avs-ro-thermal.yaml b/Documentation/devicetree/bindings/thermal/brcm,avs-ro-thermal.yaml
new file mode 100644
index 0000000..98e7b57
--- /dev/null
+++ b/Documentation/devicetree/bindings/thermal/brcm,avs-ro-thermal.yaml
@@ -0,0 +1,45 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/thermal/brcm,avs-ro-thermal.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Broadcom AVS ring oscillator thermal
+
+maintainers:
+ - Stefan Wahren <wahrenst@gmx.net>
+
+description: |+
+ The thermal node should be the child of a syscon node with the
+ required property:
+
+ - compatible: Should be one of the following:
+ "brcm,bcm2711-avs-monitor", "syscon", "simple-mfd"
+
+ Refer to the the bindings described in
+ Documentation/devicetree/bindings/mfd/syscon.txt
+
+properties:
+ compatible:
+ const: brcm,bcm2711-thermal
+
+ reg:
+ maxItems: 1
+
+required:
+ - compatible
+ - reg
+
+examples:
+ - |
+ avs-monitor@7d5d2000 {
+ compatible = "brcm,bcm2711-avs-monitor",
+ "syscon", "simple-mfd";
+ reg = <0x7d5d2000 0xf00>;
+
+ thermal: thermal {
+ compatible = "brcm,bcm2711-thermal";
+ #thermal-sensor-cells = <0>;
+ };
+ };
+...
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From: Stefan Wahren <wahrenst@gmx.net>
To: Zhang Rui <rui.zhang@intel.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Amit Kucheria <amit.kucheria@verdurent.com>,
Rob Herring <robh+dt@kernel.org>, Mark Rutland <mark.rutland@arm.com>,
Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
Florian Fainelli <f.fainelli@gmail.com>,
Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>
Subject: [PATCH V3 2/4] thermal: Add BCM2711 thermal driver
Date: Tue, 7 Jan 2020 19:15:55 +0100
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Cc: devicetree@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com,
Stefan Wahren <wahrenst@gmx.net>, linux-arm-kernel@lists.infradead.org,
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This adds the thermal sensor driver for the Broadcom BCM2711 SoC,
which is placed on the Raspberry Pi 4. The driver only provides
SoC temperature reading so far.
Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Tested-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
drivers/thermal/broadcom/Kconfig | 7 ++
drivers/thermal/broadcom/Makefile | 1 +
drivers/thermal/broadcom/bcm2711_thermal.c | 129 +++++++++++++++++++++++++++++
3 files changed, 137 insertions(+)
create mode 100644 drivers/thermal/broadcom/bcm2711_thermal.c
--
2.7.4
diff --git a/drivers/thermal/broadcom/Kconfig b/drivers/thermal/broadcom/Kconfig
index cf43e15..061f1db 100644
--- a/drivers/thermal/broadcom/Kconfig
+++ b/drivers/thermal/broadcom/Kconfig
@@ -1,4 +1,11 @@
# SPDX-License-Identifier: GPL-2.0-only
+config BCM2711_THERMAL
+ tristate "Broadcom AVS RO thermal sensor driver"
+ depends on ARCH_BCM2835 || COMPILE_TEST
+ depends on THERMAL_OF && MFD_SYSCON
+ help
+ Support for thermal sensors on Broadcom BCM2711 SoCs.
+
config BCM2835_THERMAL
tristate "Thermal sensors on bcm2835 SoC"
depends on ARCH_BCM2835 || COMPILE_TEST
diff --git a/drivers/thermal/broadcom/Makefile b/drivers/thermal/broadcom/Makefile
index 490ab1f..c917b24 100644
--- a/drivers/thermal/broadcom/Makefile
+++ b/drivers/thermal/broadcom/Makefile
@@ -1,4 +1,5 @@
# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_BCM2711_THERMAL) += bcm2711_thermal.o
obj-$(CONFIG_BCM2835_THERMAL) += bcm2835_thermal.o
obj-$(CONFIG_BRCMSTB_THERMAL) += brcmstb_thermal.o
obj-$(CONFIG_BCM_NS_THERMAL) += ns-thermal.o
diff --git a/drivers/thermal/broadcom/bcm2711_thermal.c b/drivers/thermal/broadcom/bcm2711_thermal.c
new file mode 100644
index 0000000..b1d3c4d
--- /dev/null
+++ b/drivers/thermal/broadcom/bcm2711_thermal.c
@@ -0,0 +1,129 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Broadcom AVS RO thermal sensor driver
+ *
+ * based on brcmstb_thermal
+ *
+ * Copyright (C) 2020 Stefan Wahren
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/thermal.h>
+
+#include "../thermal_hwmon.h"
+
+#define AVS_RO_TEMP_STATUS 0x200
+ #define AVS_RO_TEMP_STATUS_valid_msk (BIT(16) | BIT(10))
+ #define AVS_RO_TEMP_STATUS_data_msk GENMASK(9, 0)
+
+struct bcm2711_thermal_priv {
+ struct regmap *regmap;
+ struct device *dev;
+ struct thermal_zone_device *thermal;
+};
+
+static int bcm2711_get_temp(void *data, int *temp)
+{
+ struct bcm2711_thermal_priv *priv = data;
+ int slope = thermal_zone_get_slope(priv->thermal);
+ int offset = thermal_zone_get_offset(priv->thermal);
+ u32 val;
+ int ret;
+ long t;
+
+ ret = regmap_read(priv->regmap, AVS_RO_TEMP_STATUS, &val);
+ if (ret)
+ return ret;
+
+ if (!(val & AVS_RO_TEMP_STATUS_valid_msk)) {
+ dev_err(priv->dev, "reading not valid\n");
+ return -EIO;
+ }
+
+ val &= AVS_RO_TEMP_STATUS_data_msk;
+
+ /* Convert a HW code to a temperature reading (millidegree celsius) */
+ t = slope * val + offset;
+ if (t < 0)
+ *temp = 0;
+ else
+ *temp = t;
+
+ return 0;
+}
+
+static const struct thermal_zone_of_device_ops bcm2711_thermal_of_ops = {
+ .get_temp = bcm2711_get_temp,
+};
+
+static const struct of_device_id bcm2711_thermal_id_table[] = {
+ { .compatible = "brcm,bcm2711-thermal" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, bcm2711_thermal_id_table);
+
+static int bcm2711_thermal_probe(struct platform_device *pdev)
+{
+ struct thermal_zone_device *thermal;
+ struct bcm2711_thermal_priv *priv;
+ struct device *dev = &pdev->dev;
+ struct device_node *parent;
+ struct regmap *regmap;
+ int ret;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ /* get regmap from syscon node */
+ parent = of_get_parent(dev->of_node); /* parent should be syscon node */
+ regmap = syscon_node_to_regmap(parent);
+ of_node_put(parent);
+ if (IS_ERR(regmap)) {
+ ret = PTR_ERR(regmap);
+ dev_err(dev, "failed to get regmap: %d\n", ret);
+ return ret;
+ }
+ priv->regmap = regmap;
+ priv->dev = dev;
+
+ thermal = devm_thermal_zone_of_sensor_register(dev, 0, priv,
+ &bcm2711_thermal_of_ops);
+ if (IS_ERR(thermal)) {
+ ret = PTR_ERR(thermal);
+ dev_err(dev, "could not register sensor: %d\n", ret);
+ return ret;
+ }
+
+ priv->thermal = thermal;
+
+ thermal->tzp->no_hwmon = false;
+ ret = thermal_add_hwmon_sysfs(thermal);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static struct platform_driver bcm2711_thermal_driver = {
+ .probe = bcm2711_thermal_probe,
+ .driver = {
+ .name = "bcm2711_thermal",
+ .of_match_table = bcm2711_thermal_id_table,
+ },
+};
+module_platform_driver(bcm2711_thermal_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Stefan Wahren");
+MODULE_DESCRIPTION("Broadcom AVS RO thermal sensor driver");
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From: Stefan Wahren <wahrenst@gmx.net>
To: Zhang Rui <rui.zhang@intel.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Amit Kucheria <amit.kucheria@verdurent.com>,
Rob Herring <robh+dt@kernel.org>, Mark Rutland <mark.rutland@arm.com>,
Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
Florian Fainelli <f.fainelli@gmail.com>,
Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>
Subject: [PATCH V3 3/4] ARM: dts: bcm2711: Enable thermal
Date: Tue, 7 Jan 2020 19:15:56 +0100
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Cc: devicetree@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com,
Stefan Wahren <wahrenst@gmx.net>, linux-arm-kernel@lists.infradead.org,
linux-pm@vger.kernel.org
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This enables thermal for the BCM2711 (used on Raspberry Pi 4) by adding
the AVS monitor and a subnode for the thermal part.
Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Tested-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
arch/arm/boot/dts/bcm2711.dtsi | 12 ++++++++++++
1 file changed, 12 insertions(+)
--
2.7.4
diff --git a/arch/arm/boot/dts/bcm2711.dtsi b/arch/arm/boot/dts/bcm2711.dtsi
index 961bed8..96f341d 100644
--- a/arch/arm/boot/dts/bcm2711.dtsi
+++ b/arch/arm/boot/dts/bcm2711.dtsi
@@ -66,6 +66,17 @@
IRQ_TYPE_LEVEL_HIGH)>;
};
+ avs_monitor: avs-monitor@7d5d2000 {
+ compatible = "brcm,bcm2711-avs-monitor",
+ "syscon", "simple-mfd";
+ reg = <0x7d5d2000 0xf00>;
+
+ thermal: thermal {
+ compatible = "brcm,bcm2711-thermal";
+ #thermal-sensor-cells = <0>;
+ };
+ };
+
dma: dma@7e007000 {
compatible = "brcm,bcm2835-dma";
reg = <0x7e007000 0xb00>;
@@ -363,6 +374,7 @@
&cpu_thermal {
coefficients = <(-487) 410040>;
+ thermal-sensors = <&thermal>;
};
&dsi0 {
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1M1HZo-1irdDo1LiM-002s6V; Tue, 07 Jan 2020 19:16:06 +0100
From: Stefan Wahren <wahrenst@gmx.net>
To: Zhang Rui <rui.zhang@intel.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Amit Kucheria <amit.kucheria@verdurent.com>,
Rob Herring <robh+dt@kernel.org>, Mark Rutland <mark.rutland@arm.com>,
Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
Florian Fainelli <f.fainelli@gmail.com>,
Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>
Subject: [PATCH V3 4/4] ARM: configs: Build BCM2711 thermal as module
Date: Tue, 7 Jan 2020 19:15:57 +0100
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Cc: devicetree@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com,
Stefan Wahren <wahrenst@gmx.net>, linux-arm-kernel@lists.infradead.org,
linux-pm@vger.kernel.org
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This builds the BCM2711 thermal driver as module for the Raspberry Pi 4.
Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Tested-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
arch/arm/configs/multi_v7_defconfig | 1 +
arch/arm64/configs/defconfig | 1 +
2 files changed, 2 insertions(+)
--
2.7.4
diff --git a/arch/arm/configs/multi_v7_defconfig b/arch/arm/configs/multi_v7_defconfig
index 3f1b96d..f5d19cc 100644
--- a/arch/arm/configs/multi_v7_defconfig
+++ b/arch/arm/configs/multi_v7_defconfig
@@ -496,6 +496,7 @@ CONFIG_IMX_THERMAL=y
CONFIG_ROCKCHIP_THERMAL=y
CONFIG_RCAR_THERMAL=y
CONFIG_ARMADA_THERMAL=y
+CONFIG_BCM2711_THERMAL=m
CONFIG_BCM2835_THERMAL=m
CONFIG_BRCMSTB_THERMAL=m
CONFIG_ST_THERMAL_MEMMAP=y
diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index 6a83ba2..b2f6673 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -442,6 +442,7 @@ CONFIG_ROCKCHIP_THERMAL=m
CONFIG_RCAR_THERMAL=y
CONFIG_RCAR_GEN3_THERMAL=y
CONFIG_ARMADA_THERMAL=y
+CONFIG_BCM2711_THERMAL=m
CONFIG_BCM2835_THERMAL=m
CONFIG_BRCMSTB_THERMAL=m
CONFIG_EXYNOS_THERMAL=y