Ping... > -----Original Message----- > From: Anson Huang [mailto:Anson.Huang@xxxxxxx] > Sent: Tuesday, April 16, 2019 11:22 AM > To: robh+dt@xxxxxxxxxx; mark.rutland@xxxxxxx; shawnguo@xxxxxxxxxx; > s.hauer@xxxxxxxxxxxxxx; kernel@xxxxxxxxxxxxxx; festevam@xxxxxxxxx; > catalin.marinas@xxxxxxx; will.deacon@xxxxxxx; rui.zhang@xxxxxxxxx; > edubezval@xxxxxxxxx; daniel.lezcano@xxxxxxxxxx; Aisheng Dong > <aisheng.dong@xxxxxxx>; ulf.hansson@xxxxxxxxxx; Daniel Baluta > <daniel.baluta@xxxxxxx>; Peng Fan <peng.fan@xxxxxxx>; > heiko@xxxxxxxxx; horms+renesas@xxxxxxxxxxxx; agross@xxxxxxxxxx; > olof@xxxxxxxxx; bjorn.andersson@xxxxxxxxxx; jagan@xxxxxxxxxxxxxxxxxxxx; > enric.balletbo@xxxxxxxxxxxxx; marc.w.gonzalez@xxxxxxx; > devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-arm- > kernel@xxxxxxxxxxxxxxxxxxx; linux-pm@xxxxxxxxxxxxxxx > Cc: dl-linux-imx <linux-imx@xxxxxxx> > Subject: [PATCH V12 3/5] thermal: imx_sc: add i.MX system controller > thermal support > > 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@xxxxxxx> > --- > Changes since V11: > - move the API of getting thermal zone sensor ID to of-thermal.c as > generic API; > - remove unnecessary __packed. > --- > drivers/thermal/Kconfig | 11 ++++ > drivers/thermal/Makefile | 1 + > drivers/thermal/imx_sc_thermal.c | 137 > +++++++++++++++++++++++++++++++++++++++ > 3 files changed, 149 insertions(+) > create mode 100644 drivers/thermal/imx_sc_thermal.c > > diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index > 653aa27..4e4fa7e 100644 > --- a/drivers/thermal/Kconfig > +++ b/drivers/thermal/Kconfig > @@ -223,6 +223,17 @@ 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) || 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 > 486d682..4062627 100644 > --- a/drivers/thermal/Makefile > +++ b/drivers/thermal/Makefile > @@ -40,6 +40,7 @@ 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..dcf16fc > --- /dev/null > +++ b/drivers/thermal/imx_sc_thermal.c > @@ -0,0 +1,137 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +/* > + * Copyright 2018-2019 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 > + > +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) { > + pr_err("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; > + 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; > + > + for_each_available_child_of_node(np, child) { > + struct of_phandle_args sensor_specs; > + struct imx_sc_sensor *sensor = > + devm_kzalloc(&pdev->dev, sizeof(*sensor), > GFP_KERNEL); > + if (!sensor) > + return -ENOMEM; > + > + ret = thermal_zone_of_get_sensor_id(child, > + &sensor_specs, > + &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; > + } > + } > + > + 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@xxxxxxx>"); > +MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system > +controller"); MODULE_LICENSE("GPL v2"); > -- > 2.7.4
