diff mbox series

[V15,RESEND,3/5] thermal: imx_sc: add i.MX system controller thermal support

Message ID 1582161028-2844-3-git-send-email-Anson.Huang@nxp.com (mailing list archive)
State Superseded, archived
Headers show
Series [V15,RESEND,1/5] dt-bindings: fsl: scu: add thermal binding | expand

Commit Message

Anson Huang Feb. 20, 2020, 1:10 a.m. UTC 
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>
---
No change.
---
 drivers/thermal/Kconfig          |  11 +++
 drivers/thermal/Makefile         |   1 +
 drivers/thermal/imx_sc_thermal.c | 142 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 154 insertions(+)
 create mode 100644 drivers/thermal/imx_sc_thermal.c

Comments

Daniel Lezcano Feb. 21, 2020, 12:53 p.m. UTC | #1 
Hi Anson,

sorry for the delay with this review, hopefully the upstreaming will be now a
bit more smooth.

Apart the comments below, the driver looks good to me.

On Thu, Feb 20, 2020 at 09:10:26AM +0800, 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>
> ---
> No change.
> ---
>  drivers/thermal/Kconfig          |  11 +++
>  drivers/thermal/Makefile         |   1 +
>  drivers/thermal/imx_sc_thermal.c | 142 +++++++++++++++++++++++++++++++++++++++
>  3 files changed, 154 insertions(+)
>  create mode 100644 drivers/thermal/imx_sc_thermal.c
> 
> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> index 5a05db5..d1cb8dc 100644
> --- a/drivers/thermal/Kconfig
> +++ b/drivers/thermal/Kconfig
> @@ -251,6 +251,17 @@ 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 && IMX_SCU

IMX_SCU depends on IMX_MBOX which depends on ARCH_MXC. This dependency could be
simplified.

Also add the COMPILE_TEST option to improve compilation test coverage.

> +	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 9fb88e2..a11a6d8 100644
> --- a/drivers/thermal/Makefile
> +++ b/drivers/thermal/Makefile
> @@ -43,6 +43,7 @@ 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..d406ecb
> --- /dev/null
> +++ b/drivers/thermal/imx_sc_thermal.c
> @@ -0,0 +1,142 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright 2018-2019 NXP.

*sigh* 2020 now ...

[ ... ]

> +static int imx_sc_thermal_get_temp(void *data, int *temp)
> +{
> +	struct imx_sc_msg_misc_get_temp msg;
> +	struct imx_sc_rpc_msg *hdr = &msg.hdr;
> +	struct imx_sc_sensor *sensor = data;
> +	int ret;
> +
> +	msg.data.req.resource_id = sensor->resource_id;
> +	msg.data.req.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;

Can you explain this 'size' value?

[ ... ]

> +MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);
> +
> +static struct platform_driver imx_sc_thermal_driver = {
> +		.probe = imx_sc_thermal_probe,

The driver can be compiled as module but there is no 'remove' callback

> +		.driver = {
> +			.name = "imx-sc-thermal",
> +			.of_match_table = imx_sc_thermal_table,
> +		},
> +};
> +module_platform_driver(imx_sc_thermal_driver);
> +
> +MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
> +MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
> +MODULE_LICENSE("GPL v2");
Anson Huang Feb. 21, 2020, 11:46 p.m. UTC | #2 
Hi, Daniel

> Subject: Re: [PATCH V15 RESEND 3/5] thermal: imx_sc: add i.MX system
> controller thermal support
> 
> Hi Anson,
> 
> sorry for the delay with this review, hopefully the upstreaming will be now a
> bit more smooth.

Thanks very much for review
Daniel Lezcano Feb. 22, 2020, 7:39 a.m. UTC | #3 
On 22/02/2020 00:46, Anson Huang wrote:
> Hi, Daniel
> 
>> Subject: Re: [PATCH V15 RESEND 3/5] thermal: imx_sc: add i.MX system
>> controller thermal support
>>
>> Hi Anson,
>>
>> sorry for the delay with this review, hopefully the upstreaming will be now a
>> bit more smooth.
> 
> Thanks very much for review
diff mbox series

Patch

diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index 5a05db5..d1cb8dc 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -251,6 +251,17 @@  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 && IMX_SCU
+	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 9fb88e2..a11a6d8 100644
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -43,6 +43,7 @@  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..d406ecb
--- /dev/null
+++ b/drivers/thermal/imx_sc_thermal.c
@@ -0,0 +1,142 @@ 
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2018-2019 NXP.
+ */
+
+#include <linux/err.h>
+#include <linux/firmware/imx/sci.h>
+#include <linux/firmware/imx/types.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
+
+static struct imx_sc_ipc *thermal_ipc_handle;
+
+struct imx_sc_sensor {
+	struct thermal_zone_device *tzd;
+	u32 resource_id;
+};
+
+struct req_get_temp {
+	u16 resource_id;
+	u8 type;
+} __packed;
+
+struct resp_get_temp {
+	u16 celsius;
+	u8 tenths;
+} __packed;
+
+struct imx_sc_msg_misc_get_temp {
+	struct imx_sc_rpc_msg hdr;
+	union {
+		struct req_get_temp req;
+		struct resp_get_temp resp;
+	} data;
+};
+
+static int imx_sc_thermal_get_temp(void *data, int *temp)
+{
+	struct imx_sc_msg_misc_get_temp msg;
+	struct imx_sc_rpc_msg *hdr = &msg.hdr;
+	struct imx_sc_sensor *sensor = data;
+	int ret;
+
+	msg.data.req.resource_id = sensor->resource_id;
+	msg.data.req.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) {
+		dev_err(&sensor->tzd->device, "read temp sensor %d failed, ret %d\n",
+			sensor->resource_id, ret);
+		return ret;
+	}
+
+	*temp = msg.data.resp.celsius * 1000 + msg.data.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_probe(struct platform_device *pdev)
+{
+	struct device_node *np, *child, *sensor_np;
+	struct imx_sc_sensor *sensor;
+	int ret;
+
+	ret = imx_scu_get_handle(&thermal_ipc_handle);
+	if (ret)
+		return ret;
+
+	np = of_find_node_by_name(NULL, "thermal-zones");
+	if (!np)
+		return -ENODEV;
+
+	sensor_np = of_node_get(pdev->dev.of_node);
+
+	for_each_available_child_of_node(np, child) {
+		sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
+		if (!sensor) {
+			of_node_put(sensor_np);
+			return -ENOMEM;
+		}
+
+		ret = thermal_zone_of_get_sensor_id(child,
+						    sensor_np,
+						    &sensor->resource_id);
+		if (ret < 0) {
+			dev_err(&pdev->dev,
+				"failed to get valid sensor resource id: %d\n",
+				ret);
+			break;
+		}
+
+		sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
+								   sensor->resource_id,
+								   sensor,
+								   &imx_sc_thermal_ops);
+		if (IS_ERR(sensor->tzd)) {
+			dev_err(&pdev->dev, "failed to register thermal zone\n");
+			ret = PTR_ERR(sensor->tzd);
+			break;
+		}
+	}
+
+	of_node_put(sensor_np);
+
+	return ret;
+}
+
+static const struct of_device_id imx_sc_thermal_table[] = {
+	{ .compatible = "fsl,imx-sc-thermal", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);
+
+static struct platform_driver imx_sc_thermal_driver = {
+		.probe = imx_sc_thermal_probe,
+		.driver = {
+			.name = "imx-sc-thermal",
+			.of_match_table = imx_sc_thermal_table,
+		},
+};
+module_platform_driver(imx_sc_thermal_driver);
+
+MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
+MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
+MODULE_LICENSE("GPL v2");