Re: [PATCH v1 1/3] thermal: rockchip: add pinctrl control

From: elaine.zhang
Date: Thu Apr 11 2019 - 03:47:17 EST

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hi,

å 2019/4/4 äå11:03, Daniel Lezcano åé:

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:
ÂÂÂÂÂÂÂ tsadc: tsadc@ff250000 {
ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ compatible = "rockchip,rk3328-tsadc";
ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ .....
ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ pinctrl-names = "init", "default", "sleep";
ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ pinctrl-0 = <&otp_gpio>;
ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ pinctrl-1 = <&otp_out>;
ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ pinctrl-2 = <&otp_gpio>;
ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ status = "disabled";
ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ .....
ÂÂÂÂÂÂÂÂÂÂÂ };
ÂÂÂÂÂÂÂ &tsadc {
ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ rockchip,hw-tshut-mode = <0>; /* tshut mode 0:CRU 1:GPIO */
ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ status = "okay";
ÂÂÂÂÂÂÂ };
ÂÂÂ Application on the product, hope tsadc overtemperature reset cru to restart.
ÂÂÂ But when pinctrl is initialized, it will setting pinctrl by "init" and "default".
ÂÂÂ So the pinctrl will set iomux to "otp_out", which may be make system crash.
ÂÂÂ tsadc gpio iomux:
ÂÂÂ "otp_gpio" : just normal gpio, keep default level.
ÂÂÂ "otp_out" : tsadc shut down io, when overtemperature,this io may be trigger high
ÂÂÂ level or low level(depend on the tsadc polarity).

ÂÂÂ After correction:
ÂÂÂ if rockchip,hw-tshut-mode = <0>; (tsadc overtemperature reset cru to restart)
ÂÂÂ select pinctrl to otp_gpio
ÂÂÂ if rockchip,hw-tshut-mode = <1>;(tsadc overtemperature IO triggers output at high or low levels)
ÂÂÂ select pinctrl to otp_out.
ÂÂÂ Actively select iomux based on rockchip,hw-tshut-mode,
ÂÂÂ rather than relying on the pinctrl framework to select iomux.

Signed-off-by: Elaine Zhang <zhangqing@xxxxxxxxxxxxxx>
---
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 thoseï 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;
}

Next message: Mao Han: "Re: [PATCH v3 1/3] perf: use hweight64 instead of hweight_long"
Previous message: Martin Schwidefsky: "Re: [PATCH 05/12] s390: zcrypt: initialize variables before_use"
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