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Date:   Wed, 28 Nov 2018 10:08:57 +0100
From:   Lothar =?UTF-8?B?V2HDn21hbm4=?= <LW@KARO-electronics.de>
To:     Anson Huang <anson.huang@nxp.com>
Cc:     "rui.zhang@intel.com" <rui.zhang@intel.com>,
        "edubezval@gmail.com" <edubezval@gmail.com>,
        "daniel.lezcano@linaro.org" <daniel.lezcano@linaro.org>,
        "robh+dt@kernel.org" <robh+dt@kernel.org>,
        "mark.rutland@arm.com" <mark.rutland@arm.com>,
        "catalin.marinas@arm.com" <catalin.marinas@arm.com>,
        "will.deacon@arm.com" <will.deacon@arm.com>,
        Aisheng DONG <aisheng.dong@nxp.com>,
        Andy Gross <andy.gross@linaro.org>,
        "heiko@sntech.de" <heiko@sntech.de>,
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        "arnd@arndb.de" <arnd@arndb.de>,
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        "olof@lixom.net" <olof@lixom.net>,
        "bjorn.andersson@linaro.org" <bjorn.andersson@linaro.org>,
        "linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
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        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>,
        "shawnguo@kernel.org" <shawnguo@kernel.org>,
        dl-linux-imx <linux-imx@nxp.com>
Subject: Re: [PATCH V2 2/4] thermal: imx_sc: add i.MX system controller
 thermal support
Message-ID: <20181128100857.1181263d@karo-electronics.de>
In-Reply-To: <1543384349-2851-3-git-send-email-Anson.Huang@nxp.com>
References: <1543384349-2851-1-git-send-email-Anson.Huang@nxp.com>
        <1543384349-2851-3-git-send-email-Anson.Huang@nxp.com>
Organization: Ka-Ro electronics GmbH
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Hi,

On Wed, 28 Nov 2018 05:58:22 +0000 Anson Huang wrote:
> i.MX8QXP is an ARMv8 SoC which has a Cortex-M4 system controller
> inside, the system controller is in charge of controlling power,
> clock and thermal sensors etc..
> 
> This patch adds i.MX system controller thermal driver support,
> Linux kernel has to communicate with system controller via MU
> (message unit) IPC to get each thermal sensor's temperature,
> it supports multiple sensors which are passed from device tree,
> please see the binding doc for details.
> 
> Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
> ---
> changes since V1:
> 	remove boiler plate license text;
> 	remove unnecessary kfree during probe;
> 	remove build warning of comparing unsigned int with < 0;
>  drivers/thermal/Kconfig          |  11 +++
>  drivers/thermal/Makefile         |   1 +
>  drivers/thermal/imx_sc_thermal.c | 201 +++++++++++++++++++++++++++++++++++++++
>  3 files changed, 213 insertions(+)
>  create mode 100644 drivers/thermal/imx_sc_thermal.c
> 
> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> index 0e69edc..84e850c 100644
> --- a/drivers/thermal/Kconfig
> +++ b/drivers/thermal/Kconfig
> @@ -222,6 +222,17 @@ config IMX_THERMAL
>  	  cpufreq is used as the cooling device to throttle CPUs when the
>  	  passive trip is crossed.
>  
> +config IMX_SC_THERMAL
> +	tristate "Temperature sensor driver for NXP i.MX SoCs with System Controller"
> +	depends on ARCH_MXC || COMPILE_TEST
> +	depends on OF
> +	help
> +	  Support for Temperature Monitor (TEMPMON) found on NXP i.MX SoCs with
> +	  system controller inside, Linux kernel has to communicate with system
> +	  controller via MU (message unit) IPC to get temperature from thermal
> +	  sensor. It supports one critical trip point and one
> +	  passive trip point for each thermal sensor.
> +
>  config MAX77620_THERMAL
>  	tristate "Temperature sensor driver for Maxim MAX77620 PMIC"
>  	depends on MFD_MAX77620
> diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
> index 610344e..1b13f6a 100644
> --- a/drivers/thermal/Makefile
> +++ b/drivers/thermal/Makefile
> @@ -41,6 +41,7 @@ obj-$(CONFIG_DB8500_THERMAL)	+= db8500_thermal.o
>  obj-$(CONFIG_ARMADA_THERMAL)	+= armada_thermal.o
>  obj-$(CONFIG_TANGO_THERMAL)	+= tango_thermal.o
>  obj-$(CONFIG_IMX_THERMAL)	+= imx_thermal.o
> +obj-$(CONFIG_IMX_SC_THERMAL)	+= imx_sc_thermal.o
>  obj-$(CONFIG_MAX77620_THERMAL)	+= max77620_thermal.o
>  obj-$(CONFIG_QORIQ_THERMAL)	+= qoriq_thermal.o
>  obj-$(CONFIG_DA9062_THERMAL)	+= da9062-thermal.o
> diff --git a/drivers/thermal/imx_sc_thermal.c b/drivers/thermal/imx_sc_thermal.c
> new file mode 100644
> index 0000000..890537f
> --- /dev/null
> +++ b/drivers/thermal/imx_sc_thermal.c
> @@ -0,0 +1,201 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright 2018 NXP.
> + */
> +
> +#include <linux/err.h>
> +#include <linux/firmware/imx/sci.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <linux/thermal.h>
> +
> +#include "thermal_core.h"
> +
> +#define IMX_SC_MISC_FUNC_GET_TEMP	13
> +#define IMX_SC_C_TEMP			0
> +
> +struct imx_sc_ipc *thermal_ipc_handle;
> +
static?

> +struct imx_sc_sensor {
> +	struct thermal_zone_device *tzd;
> +	u32 resource_id;
> +};
> +
> +struct imx_sc_thermal_data {
> +	struct imx_sc_sensor *sensor;
> +};
> +
> +struct imx_sc_msg_req_misc_get_temp {
> +	struct imx_sc_rpc_msg hdr;
> +	u16 resource_id;
> +	u8 type;
> +} __packed;
> +
> +struct imx_sc_msg_resp_misc_get_temp {
> +	struct imx_sc_rpc_msg hdr;
> +	u16 celsius;
> +	u8 tenths;
> +} __packed;
> +
> +static int imx_sc_thermal_get_temp(void *data, int *temp)
> +{
> +	struct imx_sc_msg_resp_misc_get_temp *resp;
> +	struct imx_sc_msg_req_misc_get_temp msg;
> +	struct imx_sc_rpc_msg *hdr = &msg.hdr;
> +	struct imx_sc_sensor *sensor = data;
> +	int ret;
> +
> +	msg.resource_id = sensor->resource_id;
> +	msg.type = IMX_SC_C_TEMP;
> +
> +	hdr->ver = IMX_SC_RPC_VERSION;
> +	hdr->svc = IMX_SC_RPC_SVC_MISC;
> +	hdr->func = IMX_SC_MISC_FUNC_GET_TEMP;
> +	hdr->size = 2;
> +
> +	ret = imx_scu_call_rpc(thermal_ipc_handle, &msg, true);
> +	if (ret) {
> +		pr_err("read temp sensor %d failed, ret %d\n",
> +			sensor->resource_id, ret);
> +		return ret;
> +	}
> +
> +	resp = (struct imx_sc_msg_resp_misc_get_temp *)&msg;
> +	*temp = resp->celsius * 1000 + resp->tenths * 100;
> +
> +	return 0;
> +}
> +
> +static const struct thermal_zone_of_device_ops imx_sc_thermal_ops = {
> +	.get_temp = imx_sc_thermal_get_temp,
> +};
> +
> +static int imx_sc_thermal_register_sensor(struct platform_device *pdev,
> +					  struct imx_sc_sensor *sensor)
> +{
> +	struct thermal_zone_device *tzd;
> +
> +	tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
> +						   sensor->resource_id,
> +						   sensor,
> +						   &imx_sc_thermal_ops);
> +	if (IS_ERR(tzd)) {
> +		dev_err(&pdev->dev, "failed to register sensor: %d\n",
> +			sensor->resource_id);
> +		return -EINVAL;
return PTR_ERR(tzd)?

> +	}
> +
> +	sensor->tzd = tzd;
> +
> +	return 0;
> +}
> +
> +static int imx_sc_thermal_get_sensor_id(struct device_node *sensor_np, u32 *id)
> +{
> +	struct of_phandle_args sensor_specs;
> +	int ret;
> +
> +	ret = of_parse_phandle_with_args(sensor_np, "thermal-sensors",
> +			"#thermal-sensor-cells",
> +			0, &sensor_specs);
> +	if (ret)
> +		return ret;
> +
> +	if (sensor_specs.args_count >= 1) {
> +		*id = sensor_specs.args[0];
> +		WARN(sensor_specs.args_count > 1,
> +				"%pOFn: too many cells in sensor specifier %d\n",
> +				sensor_specs.np, sensor_specs.args_count);
> +	} else {
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static int imx_sc_thermal_probe(struct platform_device *pdev)
> +{
> +	struct device_node *np = pdev->dev.of_node;
> +	struct device_node *sensor_np = NULL;
> +	struct imx_sc_thermal_data *data;
> +	struct imx_sc_sensor *sensors;
> +	u32 sensor_num;
> +	int ret, i;
> +
> +	ret = imx_scu_get_handle(&thermal_ipc_handle);
> +	if (ret) {
> +		if (ret == -EPROBE_DEFER)
> +			return ret;
> +
> +		dev_err(&pdev->dev, "failed to get ipc handle: %d!\n", ret);
> +		return ret;
> +	}
> +
> +	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
> +	if (!data)
> +		return -ENOMEM;
> +
> +	ret = of_property_read_u32(np, "tsens-num", &sensor_num);
> +	if (ret || !sensor_num) {
> +		dev_err(&pdev->dev, "failed to get valid temp sensor number!\n");
> +		return -EINVAL;
> +	}
> +
> +	sensors = devm_kzalloc(&pdev->dev, sizeof(*data->sensor) * sensor_num,
> +			       GFP_KERNEL);
> +	if (!sensors)
> +		return -ENOMEM;
> +
> +	data->sensor = sensors;
> +
> +	np = of_find_node_by_name(NULL, "thermal-zones");
> +	if (!np)
> +		return -ENODEV;
> +
> +	for (i = 0; i < sensor_num; i++) {
> +		struct imx_sc_sensor *sensor = &data->sensor[i];
> +
> +		sensor_np = of_get_next_child(np, sensor_np);
> +		ret = imx_sc_thermal_get_sensor_id(sensor_np, &sensor->resource_id);
> +		if (ret < 0) {
> +			dev_err(&pdev->dev,
> +				"failed to get valid sensor resource id: %d\n",
> +				ret);
> +			break;
> +		}
> +
> +		ret = imx_sc_thermal_register_sensor(pdev, sensor);
> +		if (ret) {
> +			dev_err(&pdev->dev, "failed to register thermal sensor: %d\n",
> +				ret);
> +			break;
> +		}
> +	}
> +
> +	of_node_put(np);
> +	of_node_put(sensor_np);
> +
> +	return ret;
> +}
> +
> +static const struct of_device_id imx_sc_thermal_table[] = {
> +	{ .compatible = "nxp,imx8qxp-sc-thermal", },
> +	{},
> +};
s/{},/{}/


Lothar Waßmann