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path: root/drivers/pwm/pwm-stm32.c
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Diffstat (limited to 'drivers/pwm/pwm-stm32.c')
-rw-r--r--drivers/pwm/pwm-stm32.c56
1 files changed, 30 insertions, 26 deletions
diff --git a/drivers/pwm/pwm-stm32.c b/drivers/pwm/pwm-stm32.c
index 5f10cba492..0c028d17c0 100644
--- a/drivers/pwm/pwm-stm32.c
+++ b/drivers/pwm/pwm-stm32.c
@@ -27,7 +27,6 @@ struct stm32_breakinput {
};
struct stm32_pwm {
- struct pwm_chip chip;
struct mutex lock; /* protect pwm config/enable */
struct clk *clk;
struct regmap *regmap;
@@ -40,7 +39,7 @@ struct stm32_pwm {
static inline struct stm32_pwm *to_stm32_pwm_dev(struct pwm_chip *chip)
{
- return container_of(chip, struct stm32_pwm, chip);
+ return pwmchip_get_drvdata(chip);
}
static u32 active_channels(struct stm32_pwm *dev)
@@ -90,11 +89,12 @@ static u32 active_channels(struct stm32_pwm *dev)
* - Period = t2 - t0
* - Duty cycle = t1 - t0
*/
-static int stm32_pwm_raw_capture(struct stm32_pwm *priv, struct pwm_device *pwm,
+static int stm32_pwm_raw_capture(struct pwm_chip *chip, struct pwm_device *pwm,
unsigned long tmo_ms, u32 *raw_prd,
u32 *raw_dty)
{
- struct device *parent = priv->chip.dev->parent;
+ struct stm32_pwm *priv = to_stm32_pwm_dev(chip);
+ struct device *parent = pwmchip_parent(chip)->parent;
enum stm32_timers_dmas dma_id;
u32 ccen, ccr;
int ret;
@@ -170,7 +170,7 @@ static int stm32_pwm_capture(struct pwm_chip *chip, struct pwm_device *pwm,
ret = clk_enable(priv->clk);
if (ret) {
- dev_err(priv->chip.dev, "failed to enable counter clock\n");
+ dev_err(pwmchip_parent(chip), "failed to enable counter clock\n");
goto unlock;
}
@@ -208,7 +208,7 @@ static int stm32_pwm_capture(struct pwm_chip *chip, struct pwm_device *pwm,
TIM_CCER_CC12P : TIM_CCER_CC34P, pwm->hwpwm < 2 ?
TIM_CCER_CC2P : TIM_CCER_CC4P);
- ret = stm32_pwm_raw_capture(priv, pwm, tmo_ms, &raw_prd, &raw_dty);
+ ret = stm32_pwm_raw_capture(chip, pwm, tmo_ms, &raw_prd, &raw_dty);
if (ret)
goto stop;
@@ -229,7 +229,7 @@ static int stm32_pwm_capture(struct pwm_chip *chip, struct pwm_device *pwm,
/* 2nd measure with new scale */
psc /= scale;
regmap_write(priv->regmap, TIM_PSC, psc);
- ret = stm32_pwm_raw_capture(priv, pwm, tmo_ms, &raw_prd,
+ ret = stm32_pwm_raw_capture(chip, pwm, tmo_ms, &raw_prd,
&raw_dty);
if (ret)
goto stop;
@@ -257,7 +257,7 @@ static int stm32_pwm_capture(struct pwm_chip *chip, struct pwm_device *pwm,
FIELD_PREP(TIM_CCMR_IC1PSC, icpsc) |
FIELD_PREP(TIM_CCMR_IC2PSC, icpsc));
- ret = stm32_pwm_raw_capture(priv, pwm, tmo_ms, &raw_prd, &raw_dty);
+ ret = stm32_pwm_raw_capture(chip, pwm, tmo_ms, &raw_prd, &raw_dty);
if (ret)
goto stop;
@@ -605,7 +605,7 @@ static void stm32_pwm_detect_complementary(struct stm32_pwm *priv)
priv->have_complementary_output = (ccer != 0);
}
-static unsigned int stm32_pwm_detect_channels(struct stm32_pwm *priv,
+static unsigned int stm32_pwm_detect_channels(struct regmap *regmap,
unsigned int *num_enabled)
{
u32 ccer, ccer_backup;
@@ -614,10 +614,10 @@ static unsigned int stm32_pwm_detect_channels(struct stm32_pwm *priv,
* If channels enable bits don't exist writing 1 will have no
* effect so we can detect and count them.
*/
- regmap_read(priv->regmap, TIM_CCER, &ccer_backup);
- regmap_set_bits(priv->regmap, TIM_CCER, TIM_CCER_CCXE);
- regmap_read(priv->regmap, TIM_CCER, &ccer);
- regmap_write(priv->regmap, TIM_CCER, ccer_backup);
+ regmap_read(regmap, TIM_CCER, &ccer_backup);
+ regmap_set_bits(regmap, TIM_CCER, TIM_CCER_CCXE);
+ regmap_read(regmap, TIM_CCER, &ccer);
+ regmap_write(regmap, TIM_CCER, ccer_backup);
*num_enabled = hweight32(ccer_backup & TIM_CCER_CCXE);
@@ -629,14 +629,18 @@ static int stm32_pwm_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct stm32_timers *ddata = dev_get_drvdata(pdev->dev.parent);
+ struct pwm_chip *chip;
struct stm32_pwm *priv;
- unsigned int num_enabled;
+ unsigned int npwm, num_enabled;
unsigned int i;
int ret;
- priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
- if (!priv)
- return -ENOMEM;
+ npwm = stm32_pwm_detect_channels(ddata->regmap, &num_enabled);
+
+ chip = devm_pwmchip_alloc(dev, npwm, sizeof(*priv));
+ if (IS_ERR(chip))
+ return PTR_ERR(chip);
+ priv = to_stm32_pwm_dev(chip);
mutex_init(&priv->lock);
priv->regmap = ddata->regmap;
@@ -652,37 +656,36 @@ static int stm32_pwm_probe(struct platform_device *pdev)
stm32_pwm_detect_complementary(priv);
- priv->chip.dev = dev;
- priv->chip.ops = &stm32pwm_ops;
- priv->chip.npwm = stm32_pwm_detect_channels(priv, &num_enabled);
+ chip->ops = &stm32pwm_ops;
/* Initialize clock refcount to number of enabled PWM channels. */
for (i = 0; i < num_enabled; i++)
clk_enable(priv->clk);
- ret = devm_pwmchip_add(dev, &priv->chip);
+ ret = devm_pwmchip_add(dev, chip);
if (ret < 0)
return ret;
- platform_set_drvdata(pdev, priv);
+ platform_set_drvdata(pdev, chip);
return 0;
}
static int stm32_pwm_suspend(struct device *dev)
{
- struct stm32_pwm *priv = dev_get_drvdata(dev);
+ struct pwm_chip *chip = dev_get_drvdata(dev);
+ struct stm32_pwm *priv = to_stm32_pwm_dev(chip);
unsigned int i;
u32 ccer, mask;
/* Look for active channels */
ccer = active_channels(priv);
- for (i = 0; i < priv->chip.npwm; i++) {
+ for (i = 0; i < chip->npwm; i++) {
mask = TIM_CCER_CC1E << (i * 4);
if (ccer & mask) {
dev_err(dev, "PWM %u still in use by consumer %s\n",
- i, priv->chip.pwms[i].label);
+ i, chip->pwms[i].label);
return -EBUSY;
}
}
@@ -692,7 +695,8 @@ static int stm32_pwm_suspend(struct device *dev)
static int stm32_pwm_resume(struct device *dev)
{
- struct stm32_pwm *priv = dev_get_drvdata(dev);
+ struct pwm_chip *chip = dev_get_drvdata(dev);
+ struct stm32_pwm *priv = to_stm32_pwm_dev(chip);
int ret;
ret = pinctrl_pm_select_default_state(dev);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-25 09:48:49 +0000