[PATCH v8 1/5] thermal: rockchip: add driver for thermal
Caesar Wang
caesar.wang at rock-chips.com
Fri Oct 10 23:01:33 PDT 2014
Dear Dmitry,
在 2014年10月11日 01:46, Dmitry Torokhov 写道:
> 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? ;)
>
OK, maybe fix it as the follows:
enum reset_mde {
TSADC_HT_RESET_CRU = 0,
TSADC_HT_PULL_GPIO,
};
>> + 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?
Fixed. instead of using void.
>> + 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);
Ditto.
>> + 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.
Yeah.
Hmmm, there is no thought of a good way to deal with it at the moment.
Maybe do that as the follows,but should be a better way to deal.
e.g:
#define TSADCV2_DATA0 0x20
#define TSADCV2_DATA1 0x24
#define TSADCV2_DATA2 0x28
#define TSADCV2_DATA3 0x2c
#define TSADCV2_COMP0_INT 0x30
#define TSADCV2_COMP1_INT 0x34
#define TSADCV2_COMP2_INT 0x38
#define TSADCV2_COMP3_INT 0x3c
#define TSADCV2_COMP0_SHUT 0x40
#define TSADCV2_COMP1_SHUT 0x44
#define TSADCV2_COMP2_SHUT 0x48
#define TSADCV2_COMP3_SHUT 0x4c
>> +#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.
Yeah,fixed.
>> + 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?
OK,fixed.
>> +
>> + 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.
>
Fixed.
>> + if (val == 0)
>> + return -EPROBE_DEFER;
> What -EPROBE_DEFER means in this context?
>
In general, the A/D value of the channel last conversion need some time.
There isn't a need in here.
>> +
>> + /* 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.
Fixed.
It's not need.
>> + 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.
Although TSHUT(hardware shutdown temperature value) is not a generic
trip point,
TSHUT value is relative fixed and need be init as the tsadc_comp.
hmm..,if it doeen't define in the DT,we had to get a TSHUT from data,
as the about:
dev_warn(dev, "Missing default shutdown temp property\n");
data->hw_shut_temp = data->pdata->hw_shut_temp;
>> + } 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?
>
The clk is divided by xin32k from PMIC(rk808_clk_out),
the PMIC output the xin32k seem isn't readied before get the clk.
If the PMIC(rk808) driver is more front loading,I believe it will hasn't
this prblem.
>> + 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?
>
Yes, I think so.
At least, CPU and GPU zone is need.
As the TRM introduce,this system has three temperature sensors.
>> +
>> + 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.
Fixed.
>> + 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?
Fixed.
>> +
>> + 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.
>
--
Best regards,
Caesar
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