[PATCH v8 1/5] thermal: rockchip: add driver for thermal
Dmitry Torokhov
dmitry.torokhov at gmail.com
Fri Oct 10 10:46:36 PDT 2014
Hi Caesar,
On Fri, Oct 10, 2014 at 06:19:37PM +0800, Caesar Wang wrote:
> Thermal is TS-ADC Controller module supports
> user-defined mode and automatic mode.
>
> User-defined mode refers,TSADC all the control signals entirely by
> software writing to register for direct control.
>
> Automaic mode refers to the module automatically poll TSADC output,
> and the results were checked.If you find that the temperature High
> in a period of time,an interrupt is generated to the processor
> down-measures taken;If the temperature over a period of time High,
> the resulting TSHUT gave CRU module,let it reset the entire chip,
> or via GPIO give PMIC.
>
> Signed-off-by: zhaoyifeng <zyf at rock-chips.com>
> Signed-off-by: Caesar Wang <caesar.wang at rock-chips.com>
> ---
> drivers/thermal/Kconfig | 9 +
> drivers/thermal/Makefile | 1 +
> drivers/thermal/rockchip_thermal.c | 628 +++++++++++++++++++++++++++++++++++++
> 3 files changed, 638 insertions(+)
> create mode 100644 drivers/thermal/rockchip_thermal.c
>
> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> index f9a1386..24845ae 100644
> --- a/drivers/thermal/Kconfig
> +++ b/drivers/thermal/Kconfig
> @@ -133,6 +133,15 @@ config SPEAR_THERMAL
> Enable this to plug the SPEAr thermal sensor driver into the Linux
> thermal framework.
>
> +config ROCKCHIP_THERMAL
> + tristate "Rockchip thermal driver"
> + depends on ARCH_ROCKCHIP
> + help
> + Rockchip thermal driver provides support for Temperature sensor
> + ADC (TS-ADC) found on Rockchip SoCs. It supports one critical
> + trip point. Cpufreq is used as the cooling device and will throttle
> + CPUs when the Temperature crosses the passive trip point.
> +
> config RCAR_THERMAL
> tristate "Renesas R-Car thermal driver"
> depends on ARCH_SHMOBILE || COMPILE_TEST
> diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
> index de0636a..930554f 100644
> --- a/drivers/thermal/Makefile
> +++ b/drivers/thermal/Makefile
> @@ -19,6 +19,7 @@ thermal_sys-$(CONFIG_CPU_THERMAL) += cpu_cooling.o
>
> # platform thermal drivers
> obj-$(CONFIG_SPEAR_THERMAL) += spear_thermal.o
> +obj-$(CONFIG_ROCKCHIP_THERMAL) += rockchip_thermal.o
> obj-$(CONFIG_RCAR_THERMAL) += rcar_thermal.o
> obj-$(CONFIG_KIRKWOOD_THERMAL) += kirkwood_thermal.o
> obj-y += samsung/
> diff --git a/drivers/thermal/rockchip_thermal.c b/drivers/thermal/rockchip_thermal.c
> new file mode 100644
> index 0000000..ceee2c1
> --- /dev/null
> +++ b/drivers/thermal/rockchip_thermal.c
> @@ -0,0 +1,628 @@
> +/*
> + * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
> + * more details.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/cpu_cooling.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +#include <linux/platform_device.h>
> +#include <linux/thermal.h>
> +
> +/**
> +* If the temperature over a period of time High,
> +* the resulting TSHUT gave CRU module,let it reset the entire chip,
> +* or via GPIO give PMIC.
> +*/
> +enum reset_mde {
Can we spare one more letter? ;)
> + CRU = 0,
> + GPIO,
> +};
> +
> +/**
> +* The system has three Teperture Sensors.
> +* channel0 is reserve,channel1 is for CPU,and
> +* channel channel 2 is for GPU.
> +*/
> +enum sensor_id {
> + RESERVE = 0,
> + CPU,
> + GPU,
> + SENSOR_ID_END,
> +};
> +
> +struct rockchip_thermal_data {
> + const struct rockchip_tsadc_platform_data *pdata;
> + struct thermal_zone_device *tz[SENSOR_ID_END];
> + struct thermal_cooling_device *cdev;
> + void __iomem *regs;
> +
> + unsigned long temp_passive;
> + unsigned long hw_shut_temp;
> + unsigned long alarm_temp;
> + bool irq_enabled;
> + int irq;
> + int reset_mode;
> + int chn;
> +
> + struct clk *clk;
> + struct clk *pclk;
> +};
> +
> +struct rockchip_tsadc_platform_data {
> + unsigned long temp_passive;
> + unsigned long hw_shut_temp;
> + int reset_mode;
> +
> + int (*irq_handle)(void __iomem *reg);
Why does it return int and not void? What is the return value of this?
> + int (*initialize)(int reset_mode, int chn, void __iomem *reg,
Why does it return int and not void? What is the return value of this?> + unsigned long hw_shut_temp);
> + int (*control)(void __iomem *reg, bool on);
> + int (*code_to_temp)(u32 code);
> + u32 (*temp_to_code)(int temp);
> + void (*set_alarm_temp)(int chn, void __iomem *reg,
> + unsigned long alarm_temp);
> +};
> +
> +/* TSADC V2 Sensor info define: */
> +#define TSADCV2_AUTO_CON 0x04
> +#define TSADCV2_INT_EN 0x08
> +#define TSADCV2_INT_PD 0x0c
> +#define TSADCV2_DATA(chn) (0x20+chn*0x04)
Unsafe macros. You want to enclose argument in parenthesis.
> +#define TSADCV2_COMP_INT(chn) (0x30+chn*0x04)
> +#define TSADCV2_COMP_SHUT(chn) (0x40+chn*0x04)
> +#define TSADCV2_HIGHT_INT_DEBOUNCE 0x60
> +#define TSADCV2_HIGHT_TSHUT_DEBOUNCE 0x64
> +#define TSADCV2_AUTO_PERIOD 0x68
> +#define TSADCV2_AUTO_PERIOD_HT 0x6c
> +
> +#define TSADCV2_AUTO_EN BIT(0)
> +#define TSADCV2_AUTO_DISABLE ~BIT(0)
> +#define TSADCV2_AUTO_SRC_EN(chn) (0xf << (4 + chn))
> +#define TSADCV2_AUTO_TSHUT_POLARITY_HIGH BIT(8)
> +
> +#define TSADCV2_INT_SRC_EN(chn) BIT(chn)
> +#define TSADCV2_SHUT_2GPIO_SRC_EN(chn) (0xf << (4 + chn))
> +#define TSADCV2_SHUT_2CRU_SRC_EN(chn) (0xf << (8 + chn))
> +
> +#define TSADCV2_INT_PD_CLEAR ~BIT(8)
> +
> +#define TSADCV2_DATA_MASK 0xfff
> +#define TSADCV2_HIGHT_INT_DEBOUNCE_TIME 0x0a
> +#define TSADCV2_HIGHT_TSHUT_DEBOUNCE_TIME 0x0a
> +#define TSADCV2_AUTO_PERIOD_TIME 0x03e8
> +#define TSADCV2_AUTO_PERIOD_HT_TIME 0x64
> +
> +struct tsadc_table {
> + unsigned long code;
> + int temp;
> +};
> +
> +static const struct tsadc_table v2_code_table[] = {
> + {TSADCV2_DATA_MASK, -40000},
> + {3800, -40000},
> + {3792, -35000},
> + {3783, -30000},
> + {3774, -25000},
> + {3765, -20000},
> + {3756, -15000},
> + {3747, -10000},
> + {3737, -5000},
> + {3728, 0},
> + {3718, 5000},
> + {3708, 10000},
> + {3698, 15000},
> + {3688, 20000},
> + {3678, 25000},
> + {3667, 30000},
> + {3656, 35000},
> + {3645, 40000},
> + {3634, 45000},
> + {3623, 50000},
> + {3611, 55000},
> + {3600, 60000},
> + {3588, 65000},
> + {3575, 70000},
> + {3563, 75000},
> + {3550, 80000},
> + {3537, 85000},
> + {3524, 90000},
> + {3510, 95000},
> + {3496, 100000},
> + {3482, 105000},
> + {3467, 110000},
> + {3452, 115000},
> + {3437, 120000},
> + {3421, 125000},
> + {0, 125000},
> +};
> +
> +static int rk_tsadcv2_irq_handle(void __iomem *regs)
> +{
> + u32 val;
> +
> + val = readl_relaxed(regs + TSADCV2_INT_PD);
> + writel_relaxed(val & TSADCV2_INT_PD_CLEAR, regs + TSADCV2_INT_PD);
> +
> + return 0;
> +}
> +
> +static u32 rk_tsadcv2_temp_to_code(int temp)
> +{
> + int high, low, mid, ret = 0;
> +
> + low = 0;
> + high = ARRAY_SIZE(v2_code_table) - 1;
> + mid = (high + low) / 2;
> +
> + if (temp < v2_code_table[low].temp || temp > v2_code_table[high].temp) {
> + ret = -ERANGE;
The function returns u32, you can't return -ERANGE here.
> + goto exit;
> + }
> +
> + while (low <= high) {
> + if (temp == v2_code_table[mid].temp)
> + return v2_code_table[mid].code;
> + else if (temp < v2_code_table[mid].temp)
> + high = mid - 1;
> + else
> + low = mid + 1;
> + mid = (low + high) / 2;
> + }
Hmm, you optimized temp_to_code but not code_to_temp, why?
> +
> + return 0;
> +
> +exit:
> + return ret;
> +}
> +
> +static int rk_tsadcv2_code_to_temp(u32 code)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(v2_code_table) - 1; i++) {
> + if (code >= v2_code_table[i].code)
> + return v2_code_table[i].temp;
> + }
> +
> + /* No code available,return max temperture */
> + return 125000;
> +}
> +
> +static int rk_tsadcv2_initialize(int reset_mode, int chn, void __iomem *regs,
> + unsigned long hw_shut_temp)
> +{
> + u32 shutdown_value;
> +
> + shutdown_value = rk_tsadcv2_temp_to_code(hw_shut_temp);
> +
> + /* Enable measurements at ~ 10 Hz */
> + writel_relaxed(0 | TSADCV2_AUTO_TSHUT_POLARITY_HIGH, regs +
> + TSADCV2_AUTO_CON);
> + writel_relaxed(TSADCV2_AUTO_PERIOD_TIME, regs + TSADCV2_AUTO_PERIOD);
> + writel_relaxed(TSADCV2_AUTO_PERIOD_HT_TIME, regs +
> + TSADCV2_AUTO_PERIOD_HT);
> + writel_relaxed(shutdown_value, regs + TSADCV2_COMP_SHUT(chn));
> + writel_relaxed(TSADCV2_HIGHT_INT_DEBOUNCE_TIME, regs +
> + TSADCV2_HIGHT_INT_DEBOUNCE);
> + writel_relaxed(TSADCV2_HIGHT_TSHUT_DEBOUNCE_TIME, regs +
> + TSADCV2_HIGHT_TSHUT_DEBOUNCE);
> +
> + if (reset_mode == GPIO)
> + writel_relaxed(TSADCV2_SHUT_2GPIO_SRC_EN(chn) |
> + TSADCV2_INT_SRC_EN(chn), regs +
> + TSADCV2_INT_EN);
> + else
> + writel_relaxed(TSADCV2_SHUT_2CRU_SRC_EN(chn) |
> + TSADCV2_INT_SRC_EN(chn) , regs +
> + TSADCV2_INT_EN);
> +
> + writel_relaxed(TSADCV2_AUTO_SRC_EN(chn) | TSADCV2_AUTO_EN, regs +
> + TSADCV2_AUTO_CON);
> +
> + return 0;
> +}
> +
> +static int rk_tsadcv2_control(void __iomem *regs, bool on)
> +{
> + u32 val;
> +
> + if (on) {
> + val = readl_relaxed(regs + TSADCV2_AUTO_CON);
> + writel_relaxed(val | TSADCV2_AUTO_EN, regs + TSADCV2_AUTO_CON);
> + } else {
> + val = readl_relaxed(regs + TSADCV2_AUTO_CON);
> + writel_relaxed(val & TSADCV2_AUTO_DISABLE,
> + regs + TSADCV2_AUTO_CON);
> + }
> +
> + return 0;
> +}
> +
> +static void rk_tsadcv2_alarm_temp(int chn, void __iomem *regs,
> + unsigned long alarm_temp)
> +{
> + u32 alarm_value;
> +
> + alarm_value = rk_tsadcv2_temp_to_code(alarm_temp);
> +
> + writel_relaxed(alarm_value & TSADCV2_DATA_MASK, regs +
> + TSADCV2_COMP_INT(chn));
> +}
> +
> +static const struct rockchip_tsadc_platform_data rk3288_tsadc_data = {
> + .reset_mode = GPIO, /* default TSHUT via GPIO give PMIC */
> + .temp_passive = 80000,
> + .hw_shut_temp = 120000,
> + .irq_handle = rk_tsadcv2_irq_handle,
> + .initialize = rk_tsadcv2_initialize,
> + .control = rk_tsadcv2_control,
> + .code_to_temp = rk_tsadcv2_code_to_temp,
> + .temp_to_code = rk_tsadcv2_temp_to_code,
> + .set_alarm_temp = rk_tsadcv2_alarm_temp,
> +};
> +
> +static const struct of_device_id of_rockchip_thermal_match[] = {
> + {
> + .compatible = "rockchip,rk3288-tsadc",
> + .data = (void *)&rk3288_tsadc_data,
> + },
> + { /* end */ },
> +};
> +MODULE_DEVICE_TABLE(of, of_rockchip_thermal_match);
> +
> +static void rockchip_set_alarm_temp(struct rockchip_thermal_data *data,
> + int alarm_temp)
> +{
> + const struct rockchip_tsadc_platform_data *tsadc = data->pdata;
> +
> + data->alarm_temp = alarm_temp;
> + if (tsadc->set_alarm_temp)
> + tsadc->set_alarm_temp(data->chn, data->regs, alarm_temp);
> +}
> +
> +static int rockchip_thermal_initialize(struct rockchip_thermal_data *data)
> +{
> + const struct rockchip_tsadc_platform_data *tsadc = data->pdata;
> +
> + if (data->chn == RESERVE)
> + return 0;
> +
> + if (tsadc->initialize)
> + tsadc->initialize(tsadc->reset_mode, data->chn, data->regs,
> + data->hw_shut_temp);
> +
> + rockchip_set_alarm_temp(data, data->temp_passive);
> +
> + return 0;
> +}
> +
> +static void rockchip_thermal_control(struct rockchip_thermal_data *data,
> + bool on)
> +{
> + const struct rockchip_tsadc_platform_data *tsadc = data->pdata;
> +
> + if (tsadc->control)
> + tsadc->control(data->regs, on);
> +
> + if (on) {
> + data->irq_enabled = true;
> + data->tz[data->chn]->ops->set_mode(data->tz[data->chn],
> + THERMAL_DEVICE_ENABLED);
> + } else {
> + data->irq_enabled = false;
> + data->tz[data->chn]->ops->set_mode(data->tz[data->chn],
> + THERMAL_DEVICE_DISABLED);
> + }
> +}
> +
> +static irqreturn_t rockchip_thermal_alarm_irq_thread(int irq, void *dev)
> +{
> + struct rockchip_thermal_data *data = dev;
> + const struct rockchip_tsadc_platform_data *tsadc = data->pdata;
> + int chn;
> +
> + if (tsadc->irq_handle)
> + tsadc->irq_handle(data->regs);
> +
> + for (chn = CPU; chn < SENSOR_ID_END; chn++)
> + thermal_zone_device_update(data->tz[chn]);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int rockchip_thermal_set_trips(void *zone, long low, long high)
> +{
> + struct rockchip_thermal_data *data = zone;
> + const struct rockchip_tsadc_platform_data *tsadc = data->pdata;
> + u32 val;
> +
> + low = clamp_val(low, LONG_MIN, LONG_MAX);
> + high = clamp_val(high, LONG_MIN, LONG_MAX);
> +
> + /* channel0 is RESERVE, not need to set trips*/
> + if (data->chn == RESERVE)
> + return 0;
> +
> + val = readl_relaxed(data->regs + TSADCV2_DATA(data->chn));
I do not think you need to re-read the temperature: you are already
goivent lower and upper trip points for current temperature, you just
need to set alarm to the upper one.
> + if (val == 0)
> + return -EPROBE_DEFER;
What -EPROBE_DEFER means in this context?
> +
> + /* Update alarm value to next higher trip point */
> + if (data->alarm_temp == data->temp_passive && val <=
> + tsadc->temp_to_code(data->temp_passive))
> + high = data->hw_shut_temp;
> +
> + if (data->alarm_temp >= data->temp_passive && val >
> + tsadc->temp_to_code(data->temp_passive)) {
> + high = data->temp_passive;
> + }
> +
> + return 0;
> +}
> +
> +static int rockchip_thermal_get_temp(void *zone, long *out_temp)
> +{
> + struct rockchip_thermal_data *data = zone;
> + const struct rockchip_tsadc_platform_data *tsadc = data->pdata;
> + u32 val;
> +
> + if (data->chn == RESERVE)
> + return 0;
> +
> + val = readl_relaxed(data->regs + TSADCV2_DATA(data->chn));
> +
> + if (val < tsadc->temp_to_code(data->hw_shut_temp))
> + *out_temp = 120000;
Why is this needed? If this is really needed please comment the code.
> + else
> + *out_temp = tsadc->code_to_temp(val);
> +
> + return 0;
> +}
> +
> +static int rockchip_configure_from_dt(struct device *dev,
> + struct device_node *np,
> + struct rockchip_thermal_data *data)
> +{
> + int shut_temp, reset_mode;
> +
> + if (of_property_read_u32(np, "hw-shut-temp", &shut_temp)) {
> + dev_warn(dev, "Missing default shutdown temp property\n");
> + data->hw_shut_temp = data->pdata->hw_shut_temp;
I am still not sure why we want it in DT. I envision the set up as
follows:
passive trip point - defined in DT
critical trip point - defined in DT, causes shutdown performed by
thermal core for us
hardware critical - hard coded (defined by the hardware, no point in
changing), shuts down or resets the box automatically by the hardware,
no kernel involved.
> + } else {
> + data->hw_shut_temp = shut_temp;
> + }
> +
> + if (of_property_read_u32(np, "tsadc-ht-reset-mode", &reset_mode)) {
> + dev_warn(dev, "Missing default reset mode property\n");
> + data->reset_mode = data->pdata->reset_mode;
> + } else {
> + data->reset_mode = reset_mode;
> + }
> +
> + data->temp_passive = data->pdata->temp_passive;
> +
> + return 0;
> +}
> +
> +static int rockchip_thermal_probe(struct platform_device *pdev)
> +{
> + struct rockchip_thermal_data *data;
> + const struct rockchip_tsadc_platform_data *tsadc;
> + const struct of_device_id *match;
> +
> + struct cpumask clip_cpus;
> + struct resource *res;
> + struct device_node *np = pdev->dev.of_node;
> +
> + int ret, err, chn;
> +
> + data = devm_kzalloc(&pdev->dev, sizeof(struct rockchip_thermal_data),
> + GFP_KERNEL);
> + if (!data)
> + return -ENOMEM;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + data->regs = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(data->regs)) {
> + dev_err(&pdev->dev, "Could not get tsadc source, %p\n",
> + data->regs);
> + return PTR_ERR(data->regs);
> + }
> +
> + match = of_match_node(of_rockchip_thermal_match, np);
> + if (!match)
> + return -ENXIO;
> + data->pdata = (const struct rockchip_tsadc_platform_data *)match->data;
> + if (!data->pdata)
> + return -EINVAL;
> + tsadc = data->pdata;
> +
> + data->clk = devm_clk_get(&pdev->dev, "tsadc");
> + if (IS_ERR(data->clk)) {
> + dev_err(&pdev->dev, "failed to get tsadc clock\n");
> + return PTR_ERR(data->clk);
> + }
> +
> + data->pclk = devm_clk_get(&pdev->dev, "apb_pclk");
> + if (IS_ERR(data->pclk)) {
> + dev_err(&pdev->dev, "failed to get tsadc pclk\n");
> + return PTR_ERR(data->pclk);
> + }
> +
> + /**
> + * Use a default of 10KHz for the converter clock.
> + * This may become user-configurable in the future.
> + * Need to judge the data->clk is Divided by xin32k.
> + * Need to retry it if the pmic hasn't output the xin32k.
> + */
> + if (clk_get_rate(data->clk) == 0)
> + return -EPROBE_DEFER;
What would cause the clock to be present but report 0 rate? Are we sure
that it will start reporting different data after binding some more
drivers?
> + ret = clk_set_rate(data->clk, 10000);
> + if (ret < 0) {
> + dev_err(&pdev->dev, "failed to set tsadc clk rate, %d\n", ret);
> + return ret;
> + }
> +
> + ret = clk_prepare_enable(data->clk);
> + if (ret < 0) {
> + dev_err(&pdev->dev, "failed to enable converter clock\n");
> + goto err_clk;
> + }
> +
> + ret = clk_prepare_enable(data->pclk);
> + if (ret < 0) {
> + dev_err(&pdev->dev, "failed to enable pclk\n");
> + goto err_pclk;
> + }
> +
> + cpumask_set_cpu(0, &clip_cpus);
> + data->cdev = of_cpufreq_cooling_register(np, &clip_cpus);
> + if (IS_ERR(data->cdev)) {
> + dev_err(&pdev->dev, "failed to register cpufreq cooling device\n");
> + goto disable_clk;
> + }
> +
> + data->irq = platform_get_irq(pdev, 0);
> + if (data->irq < 0) {
> + dev_err(&pdev->dev, "no irq resource?\n");
> + goto disable_clk;
> + }
> +
> + ret = devm_request_threaded_irq(&pdev->dev, data->irq, NULL,
> + &rockchip_thermal_alarm_irq_thread,
> + IRQF_ONESHOT, "rockchip_thermal",
> + data);
> + if (ret < 0) {
> + dev_err(&pdev->dev,
> + "failed to request tsadc irq: %d\n", ret);
> + goto disable_clk;
> + }
> +
> + ret = rockchip_configure_from_dt(&pdev->dev, np, data);
> + if (ret)
> + dev_err(&pdev->dev, "Parsing device tree data error.\n");
> +
> + /* The system three Teperture Sensors be registered */
> + for (chn = RESERVE; chn < SENSOR_ID_END; chn++) {
> + data->chn = chn;
> +
> + data->tz[chn] = thermal_zone_of_sensor_register(
> + &pdev->dev, data->chn,
> + data, rockchip_thermal_get_temp,
> + NULL,
> + rockchip_thermal_set_trips);
> + if (IS_ERR(data->tz[chn])) {
> + err = PTR_ERR(data->tz[chn]);
> + dev_err(&pdev->dev, "failed to register sensor: %d\n",
> + err);
> + chn--;
> + goto unregister_tzs;
> + }
Do we have to have all zones defined? Why?
> +
> + platform_set_drvdata(pdev, data);
> +
> + rockchip_thermal_initialize(data);
> + rockchip_thermal_control(data, true);
> + }
> + return 0;
> +
> +unregister_tzs:
> + for (; chn >= RESERVE; chn--)
> + thermal_zone_of_sensor_unregister(&pdev->dev, data->tz[chn]);
> + cpufreq_cooling_unregister(data->cdev);
> +
> +disable_clk:
> +err_pclk:
> + clk_disable_unprepare(data->pclk);
> +err_clk:
> + clk_disable_unprepare(data->clk);
> +
> + return ret;
> +}
> +
> +static int rockchip_thermal_remove(struct platform_device *pdev)
> +{
> + struct rockchip_thermal_data *data = platform_get_drvdata(pdev);
> + int chn;
> +
> + rockchip_thermal_control(data, false);
> +
> + for (; chn >= RESERVE; chn--)
You are not initializing chn, it will blow up.
> + thermal_zone_of_sensor_unregister(&pdev->dev, data->tz[chn]);
> + cpufreq_cooling_unregister(data->cdev);
> +
> + clk_disable_unprepare(data->clk);
> + clk_disable_unprepare(data->pclk);
> +
> + return 0;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int rockchip_thermal_suspend(struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct rockchip_thermal_data *data = platform_get_drvdata(pdev);
> +
> + rockchip_thermal_control(data, false);
> +
> + clk_disable_unprepare(data->clk);
> + clk_disable_unprepare(data->pclk);
Why do we unpreparing in suspend instead of just disabling?
> +
> + return 0;
> +}
> +
> +static int rockchip_thermal_resume(struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct rockchip_thermal_data *data = platform_get_drvdata(pdev);
> + int ret;
> +
> + ret = clk_prepare_enable(data->pclk);
> + if (ret)
> + return ret;
> +
> + ret = clk_prepare_enable(data->clk);
> + if (ret)
> + return ret;
> +
> + rockchip_thermal_initialize(data);
> + rockchip_thermal_control(data, true);
> +
> + return 0;
> +}
> +#endif
> +
> +static SIMPLE_DEV_PM_OPS(rockchip_thermal_pm_ops,
> + rockchip_thermal_suspend, rockchip_thermal_resume);
> +
> +static struct platform_driver rockchip_thermal_driver = {
> + .driver = {
> + .name = "rockchip-thermal",
> + .owner = THIS_MODULE,
> + .pm = &rockchip_thermal_pm_ops,
> + .of_match_table = of_rockchip_thermal_match,
> + },
> + .probe = rockchip_thermal_probe,
> + .remove = rockchip_thermal_remove,
> +};
> +
> +module_platform_driver(rockchip_thermal_driver);
> +
> +MODULE_DESCRIPTION("ROCKCHIP THERMAL Driver");
> +MODULE_AUTHOR("Rockchip, Inc.");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:rockchip-thermal");
> --
> 1.9.1
>
>
Thanks.
--
Dmitry
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