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Date: Thu, 11 Apr 2019 15:46:59 +0800
From: "elaine.zhang" <zhangqing@...k-chips.com>
To: Daniel Lezcano <daniel.lezcano@...aro.org>, heiko@...ech.de
Cc: rui.zhang@...el.com, edubezval@...il.com, robh+dt@...nel.org,
mark.rutland@....com, linux-pm@...r.kernel.org,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
xxx@...k-chips.com, xf@...k-chips.com, huangtao@...k-chips.com
Subject: Re: [PATCH v1 1/3] thermal: rockchip: add pinctrl control
hi,
在 2019/4/4 上午11:03, Daniel Lezcano 写道:
> On 01/04/2019 08:43, Elaine Zhang wrote:
>> Based on the TSADC Tshut mode to select pinctrl,
>> instead of setting pinctrl based on architecture
>> (Not depends on pinctrl setting by "init" or "default").
>> And it requires setting the tshut polarity before select pinctrl.
> I'm not sure to fully read the description. Can you rephrase/elaborate
> the changelog?
Example:
tsadc: tsadc@...50000 {
compatible = "rockchip,rk3328-tsadc";
.....
pinctrl-names = "init", "default", "sleep";
pinctrl-0 = <&otp_gpio>;
pinctrl-1 = <&otp_out>;
pinctrl-2 = <&otp_gpio>;
status = "disabled";
.....
};
&tsadc {
rockchip,hw-tshut-mode = <0>; /* tshut mode 0:CRU 1:GPIO */
status = "okay";
};
Application on the product, hope tsadc overtemperature reset cru to
restart.
But when pinctrl is initialized, it will setting pinctrl by "init"
and "default".
So the pinctrl will set iomux to "otp_out", which may be make
system crash.
tsadc gpio iomux:
"otp_gpio" : just normal gpio, keep default level.
"otp_out" : tsadc shut down io, when overtemperature,this io may be
trigger high
level or low level(depend on the tsadc polarity).
After correction:
if rockchip,hw-tshut-mode = <0>; (tsadc overtemperature reset cru
to restart)
select pinctrl to otp_gpio
if rockchip,hw-tshut-mode = <1>;(tsadc overtemperature IO triggers
output at high or low levels)
select pinctrl to otp_out.
Actively select iomux based on rockchip,hw-tshut-mode,
rather than relying on the pinctrl framework to select iomux.
>> Signed-off-by: Elaine Zhang <zhangqing@...k-chips.com>
>> ---
>> drivers/thermal/rockchip_thermal.c | 61 +++++++++++++++++++++++++++++++-------
>> 1 file changed, 50 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/thermal/rockchip_thermal.c b/drivers/thermal/rockchip_thermal.c
>> index 9c7643d62ed7..faa6c7792155 100644
>> --- a/drivers/thermal/rockchip_thermal.c
>> +++ b/drivers/thermal/rockchip_thermal.c
>> @@ -34,7 +34,7 @@
>> */
>> enum tshut_mode {
>> TSHUT_MODE_CRU = 0,
>> - TSHUT_MODE_GPIO,
>> + TSHUT_MODE_OTP,
> Why do you change the enum name? The impact on the patch is much higher,
> no ?
I just want to make it a little bit more intuitive to understand the
definition of mode.
TSHUT_MODE_CRU: pinctrl select iomux to otp_gpio,the io is normal io.
TSHUT_MODE_OTP: pinctrl select iomux to otp_out, the io is tsadc shut io.
>
>> };
>>
>> /**
>> @@ -172,6 +172,9 @@ struct rockchip_thermal_data {
>> int tshut_temp;
>> enum tshut_mode tshut_mode;
>> enum tshut_polarity tshut_polarity;
>> + struct pinctrl *pinctrl;
>> + struct pinctrl_state *gpio_state;
>> + struct pinctrl_state *otp_state;
>> };
>>
>> /**
>> @@ -807,7 +810,7 @@ static void rk_tsadcv2_tshut_mode(int chn, void __iomem *regs,
>> u32 val;
>>
>> val = readl_relaxed(regs + TSADCV2_INT_EN);
>> - if (mode == TSHUT_MODE_GPIO) {
>> + if (mode == TSHUT_MODE_OTP) {
>> val &= ~TSADCV2_SHUT_2CRU_SRC_EN(chn);
>> val |= TSADCV2_SHUT_2GPIO_SRC_EN(chn);
>> } else {
>> @@ -822,7 +825,7 @@ static void rk_tsadcv2_tshut_mode(int chn, void __iomem *regs,
>> .chn_id[SENSOR_CPU] = 0, /* cpu sensor is channel 0 */
>> .chn_num = 1, /* one channel for tsadc */
>>
>> - .tshut_mode = TSHUT_MODE_GPIO, /* default TSHUT via GPIO give PMIC */
>> + .tshut_mode = TSHUT_MODE_OTP, /* default TSHUT via GPIO give PMIC */
>> .tshut_polarity = TSHUT_LOW_ACTIVE, /* default TSHUT LOW ACTIVE */
>> .tshut_temp = 95000,
>>
>> @@ -846,7 +849,7 @@ static void rk_tsadcv2_tshut_mode(int chn, void __iomem *regs,
>> .chn_id[SENSOR_CPU] = 0, /* cpu sensor is channel 0 */
>> .chn_num = 1, /* one channel for tsadc */
>>
>> - .tshut_mode = TSHUT_MODE_GPIO, /* default TSHUT via GPIO give PMIC */
>> + .tshut_mode = TSHUT_MODE_OTP, /* default TSHUT via GPIO give PMIC */
>> .tshut_polarity = TSHUT_LOW_ACTIVE, /* default TSHUT LOW ACTIVE */
>> .tshut_temp = 95000,
>>
>> @@ -871,7 +874,7 @@ static void rk_tsadcv2_tshut_mode(int chn, void __iomem *regs,
>> .chn_id[SENSOR_GPU] = 2, /* gpu sensor is channel 2 */
>> .chn_num = 2, /* two channels for tsadc */
>>
>> - .tshut_mode = TSHUT_MODE_GPIO, /* default TSHUT via GPIO give PMIC */
>> + .tshut_mode = TSHUT_MODE_OTP, /* default TSHUT via GPIO give PMIC */
>> .tshut_polarity = TSHUT_LOW_ACTIVE, /* default TSHUT LOW ACTIVE */
>> .tshut_temp = 95000,
>>
>> @@ -919,7 +922,7 @@ static void rk_tsadcv2_tshut_mode(int chn, void __iomem *regs,
>> .chn_id[SENSOR_GPU] = 1, /* gpu sensor is channel 1 */
>> .chn_num = 2, /* two channels for tsadc */
>>
>> - .tshut_mode = TSHUT_MODE_GPIO, /* default TSHUT via GPIO give PMIC */
>> + .tshut_mode = TSHUT_MODE_OTP, /* default TSHUT via GPIO give PMIC */
>> .tshut_polarity = TSHUT_LOW_ACTIVE, /* default TSHUT LOW ACTIVE */
>> .tshut_temp = 95000,
>>
>> @@ -944,7 +947,7 @@ static void rk_tsadcv2_tshut_mode(int chn, void __iomem *regs,
>> .chn_id[SENSOR_GPU] = 1, /* gpu sensor is channel 1 */
>> .chn_num = 2, /* two channels for tsadc */
>>
>> - .tshut_mode = TSHUT_MODE_GPIO, /* default TSHUT via GPIO give PMIC */
>> + .tshut_mode = TSHUT_MODE_OTP, /* default TSHUT via GPIO give PMIC */
>> .tshut_polarity = TSHUT_LOW_ACTIVE, /* default TSHUT LOW ACTIVE */
>> .tshut_temp = 95000,
>>
>> @@ -969,7 +972,7 @@ static void rk_tsadcv2_tshut_mode(int chn, void __iomem *regs,
>> .chn_id[SENSOR_GPU] = 1, /* gpu sensor is channel 1 */
>> .chn_num = 2, /* two channels for tsadc */
>>
>> - .tshut_mode = TSHUT_MODE_GPIO, /* default TSHUT via GPIO give PMIC */
>> + .tshut_mode = TSHUT_MODE_OTP, /* default TSHUT via GPIO give PMIC */
>> .tshut_polarity = TSHUT_LOW_ACTIVE, /* default TSHUT LOW ACTIVE */
>> .tshut_temp = 95000,
>>
>> @@ -1080,6 +1083,20 @@ static int rockchip_thermal_get_temp(void *_sensor, int *out_temp)
>> .set_trips = rockchip_thermal_set_trips,
>> };
>>
>> +static void thermal_pinctrl_select_otp(struct rockchip_thermal_data *thermal)
>> +{
>> + if (!IS_ERR(thermal->pinctrl) && !IS_ERR_OR_NULL(thermal->otp_state))
>> + pinctrl_select_state(thermal->pinctrl,
>> + thermal->otp_state);
>> +}
>> +
>> +static void thermal_pinctrl_select_gpio(struct rockchip_thermal_data *thermal)
>> +{
>> + if (!IS_ERR(thermal->pinctrl) && !IS_ERR_OR_NULL(thermal->gpio_state))
>> + pinctrl_select_state(thermal->pinctrl,
>> + thermal->gpio_state);
>> +}
> You should not have to create a couple of specific functions just to
> check the pinctrl pointers are set. The caller should do that.
Because there are several places where the call is made,create a couple
of specific functions reduce a lot of duplicated code.
>
>> static int rockchip_configure_from_dt(struct device *dev,
>> struct device_node *np,
>> struct rockchip_thermal_data *thermal)
>> @@ -1103,7 +1120,7 @@ static int rockchip_configure_from_dt(struct device *dev,
>> if (of_property_read_u32(np, "rockchip,hw-tshut-mode", &tshut_mode)) {
>> dev_warn(dev,
>> "Missing tshut mode property, using default (%s)\n",
>> - thermal->chip->tshut_mode == TSHUT_MODE_GPIO ?
>> + thermal->chip->tshut_mode == TSHUT_MODE_OTP ?
>> "gpio" : "cru");
>> thermal->tshut_mode = thermal->chip->tshut_mode;
>> } else {
>> @@ -1242,6 +1259,8 @@ static int rockchip_thermal_probe(struct platform_device *pdev)
>> return error;
>> }
>>
>> + thermal->chip->control(thermal->regs, false);
>> +
>> error = clk_prepare_enable(thermal->clk);
>> if (error) {
>> dev_err(&pdev->dev, "failed to enable converter clock: %d\n",
>> @@ -1267,6 +1286,24 @@ static int rockchip_thermal_probe(struct platform_device *pdev)
>> thermal->chip->initialize(thermal->grf, thermal->regs,
>> thermal->tshut_polarity);
>>
>> + if (thermal->tshut_mode == TSHUT_MODE_OTP) {
>> + thermal->pinctrl = devm_pinctrl_get(&pdev->dev);
>> + if (IS_ERR(thermal->pinctrl))
>> + dev_err(&pdev->dev, "failed to find thermal pinctrl\n");
>> +
>> + thermal->gpio_state = pinctrl_lookup_state(thermal->pinctrl,
>> + "gpio");
>> + if (IS_ERR_OR_NULL(thermal->gpio_state))
>> + dev_err(&pdev->dev, "failed to find thermal gpio state\n");
>> +
>> + thermal->otp_state = pinctrl_lookup_state(thermal->pinctrl,
>> + "otpout");
>> + if (IS_ERR_OR_NULL(thermal->otp_state))
>> + dev_err(&pdev->dev, "failed to find thermal otpout state\n");
> What is the meaning for the rest of the code if the lookup fails for any
> of those ?
If the lookup fails for any of those， The pinctrl is no longer set and
remains in its default state(otp_gpio normal io).
>
>> + thermal_pinctrl_select_otp(thermal);
>> + }
>> +
>> for (i = 0; i < thermal->chip->chn_num; i++) {
>> error = rockchip_thermal_register_sensor(pdev, thermal,
>> &thermal->sensors[i],
>> @@ -1338,7 +1375,8 @@ static int __maybe_unused rockchip_thermal_suspend(struct device *dev)
>> clk_disable(thermal->pclk);
>> clk_disable(thermal->clk);
>>
>> - pinctrl_pm_select_sleep_state(dev);
>> + if (thermal->tshut_mode == TSHUT_MODE_OTP)
>> + thermal_pinctrl_select_gpio(thermal);
>>
>> return 0;
>> }
>> @@ -1383,7 +1421,8 @@ static int __maybe_unused rockchip_thermal_resume(struct device *dev)
>> for (i = 0; i < thermal->chip->chn_num; i++)
>> rockchip_thermal_toggle_sensor(&thermal->sensors[i], true);
>>
>> - pinctrl_pm_select_default_state(dev);
>> + if (thermal->tshut_mode == TSHUT_MODE_OTP)
>> + thermal_pinctrl_select_otp(thermal);
>>
>> return 0;
>> }
>>
>
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