[PATCH] drm/bridge: ti-sn65dsi86: Associate PWM device to auxiliary device

[Uwe Kleine-König]

It's the ti_sn65dsi86.pwm auxiliary driver that creates the pwmchip, so
let the auxiliary device be the parent of the pwm device.

Note that getting a reference to the ti-sn65dsi86's pwm using pwm_get()
isn't affected by this change as ti_sn65dsi86_add_aux_device() sets the
auxiliary device's of_node to that of the main device.

Also change PM runtime tracking and diagnostic messages to use that one.
As the PM runtime functions also handle parent devices this should work
fine, too.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig at pengutronix.de>
---
Hello,

this patch has an (easy to resolve) conflict with a patch I sent earlier
"drm/bridge: ti-sn65dsi86: Simplify using pm_runtime_resume_and_get()"
(https://lore.kernel.org/dri-devel/20231123175425.496956-2-u.kleine-koenig@pengutronix.de).
I was unsure if I should base this new patch on that older one.

While I think the patch is fine, I'd have a better feeling about it if
someone could give feedback that the PWM still works as intended with
this change.

Best regards
Uwe

 drivers/gpu/drm/bridge/ti-sn65dsi86.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index c45c07840f64..254f0039dad2 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -1413,9 +1413,9 @@ static int ti_sn_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	int ret;
 
 	if (!pdata->pwm_enabled) {
-		ret = pm_runtime_get_sync(pdata->dev);
+		ret = pm_runtime_get_sync(chip->dev);
 		if (ret < 0) {
-			pm_runtime_put_sync(pdata->dev);
+			pm_runtime_put_sync(chip->dev);
 			return ret;
 		}
 	}
@@ -1431,7 +1431,7 @@ static int ti_sn_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 						 SN_GPIO_MUX_MASK << (2 * SN_PWM_GPIO_IDX),
 						 SN_GPIO_MUX_SPECIAL << (2 * SN_PWM_GPIO_IDX));
 			if (ret) {
-				dev_err(pdata->dev, "failed to mux in PWM function\n");
+				dev_err(chip->dev, "failed to mux in PWM function\n");
 				goto out;
 			}
 		}
@@ -1507,7 +1507,7 @@ static int ti_sn_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 
 		ret = regmap_write(pdata->regmap, SN_PWM_PRE_DIV_REG, pre_div);
 		if (ret) {
-			dev_err(pdata->dev, "failed to update PWM_PRE_DIV\n");
+			dev_err(chip->dev, "failed to update PWM_PRE_DIV\n");
 			goto out;
 		}
 
@@ -1519,7 +1519,7 @@ static int ti_sn_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 		     FIELD_PREP(SN_PWM_INV_MASK, state->polarity == PWM_POLARITY_INVERSED);
 	ret = regmap_write(pdata->regmap, SN_PWM_EN_INV_REG, pwm_en_inv);
 	if (ret) {
-		dev_err(pdata->dev, "failed to update PWM_EN/PWM_INV\n");
+		dev_err(chip->dev, "failed to update PWM_EN/PWM_INV\n");
 		goto out;
 	}
 
@@ -1527,7 +1527,7 @@ static int ti_sn_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 out:
 
 	if (!pdata->pwm_enabled)
-		pm_runtime_put_sync(pdata->dev);
+		pm_runtime_put_sync(chip->dev);
 
 	return ret;
 }
@@ -1587,7 +1587,7 @@ static int ti_sn_pwm_probe(struct auxiliary_device *adev,
 {
 	struct ti_sn65dsi86 *pdata = dev_get_drvdata(adev->dev.parent);
 
-	pdata->pchip.dev = pdata->dev;
+	pdata->pchip.dev = &adev->dev;
 	pdata->pchip.ops = &ti_sn_pwm_ops;
 	pdata->pchip.npwm = 1;
 	pdata->pchip.of_xlate = of_pwm_single_xlate;
@@ -1603,7 +1603,7 @@ static void ti_sn_pwm_remove(struct auxiliary_device *adev)
 	pwmchip_remove(&pdata->pchip);
 
 	if (pdata->pwm_enabled)
-		pm_runtime_put_sync(pdata->dev);
+		pm_runtime_put_sync(&adev->dev);
 }
 
 static const struct auxiliary_device_id ti_sn_pwm_id_table[] = {

base-commit: 48bbaf8b793e0770798519f8ee1ea2908ff0943a
-- 
2.42.0