[PATCH v4 4/6] pwm: meson: use device data to carry information around

[Jerome Brunet]

Use struct device data to carry the information data around, instead
of embedded the pwm structure in it and using container_of()

Doing so works just as well and makes it a little easier to add setup
callback depending on the DT compatible.

Signed-off-by: Jerome Brunet <jbrunet at baylibre.com>
---
 drivers/pwm/pwm-meson.c | 39 +++++++++++++++++++++++----------------
 1 file changed, 23 insertions(+), 16 deletions(-)

diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c
index ef50c337f444..15c44185d784 100644
--- a/drivers/pwm/pwm-meson.c
+++ b/drivers/pwm/pwm-meson.c
@@ -101,7 +101,6 @@ struct meson_pwm_data {
 };
 
 struct meson_pwm {
-	struct pwm_chip chip;
 	const struct meson_pwm_data *data;
 	struct meson_pwm_channel channels[MESON_NUM_PWMS];
 	void __iomem *base;
@@ -114,7 +113,7 @@ struct meson_pwm {
 
 static inline struct meson_pwm *to_meson_pwm(struct pwm_chip *chip)
 {
-	return container_of(chip, struct meson_pwm, chip);
+	return dev_get_drvdata(chip->dev);
 }
 
 static int meson_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
@@ -146,6 +145,7 @@ static int meson_pwm_calc(struct meson_pwm *meson, struct pwm_device *pwm,
 			  const struct pwm_state *state)
 {
 	struct meson_pwm_channel *channel = &meson->channels[pwm->hwpwm];
+	struct device *dev = pwm->chip->dev;
 	unsigned int cnt, duty_cnt;
 	unsigned long fin_freq;
 	u64 duty, period, freq;
@@ -168,19 +168,19 @@ static int meson_pwm_calc(struct meson_pwm *meson, struct pwm_device *pwm,
 
 	fin_freq = clk_round_rate(channel->clk, freq);
 	if (fin_freq == 0) {
-		dev_err(meson->chip.dev, "invalid source clock frequency\n");
+		dev_err(dev, "invalid source clock frequency\n");
 		return -EINVAL;
 	}
 
-	dev_dbg(meson->chip.dev, "fin_freq: %lu Hz\n", fin_freq);
+	dev_dbg(dev, "fin_freq: %lu Hz\n", fin_freq);
 
 	cnt = div_u64(fin_freq * period, NSEC_PER_SEC);
 	if (cnt > 0xffff) {
-		dev_err(meson->chip.dev, "unable to get period cnt\n");
+		dev_err(dev, "unable to get period cnt\n");
 		return -EINVAL;
 	}
 
-	dev_dbg(meson->chip.dev, "period=%llu cnt=%u\n", period, cnt);
+	dev_dbg(dev, "period=%llu cnt=%u\n", period, cnt);
 
 	if (duty == period) {
 		channel->hi = cnt;
@@ -191,7 +191,7 @@ static int meson_pwm_calc(struct meson_pwm *meson, struct pwm_device *pwm,
 	} else {
 		duty_cnt = div_u64(fin_freq * duty, NSEC_PER_SEC);
 
-		dev_dbg(meson->chip.dev, "duty=%llu duty_cnt=%u\n", duty, duty_cnt);
+		dev_dbg(dev, "duty=%llu duty_cnt=%u\n", duty, duty_cnt);
 
 		channel->hi = duty_cnt;
 		channel->lo = cnt - duty_cnt;
@@ -214,7 +214,7 @@ static void meson_pwm_enable(struct meson_pwm *meson, struct pwm_device *pwm)
 
 	err = clk_set_rate(channel->clk, channel->rate);
 	if (err)
-		dev_err(meson->chip.dev, "setting clock rate failed\n");
+		dev_err(pwm->chip->dev, "setting clock rate failed\n");
 
 	spin_lock_irqsave(&meson->lock, flags);
 
@@ -425,10 +425,10 @@ static const struct of_device_id meson_pwm_matches[] = {
 };
 MODULE_DEVICE_TABLE(of, meson_pwm_matches);
 
-static int meson_pwm_init_channels(struct meson_pwm *meson)
+static int meson_pwm_init_channels(struct device *dev)
 {
 	struct clk_parent_data mux_parent_data[MESON_NUM_MUX_PARENTS] = {};
-	struct device *dev = meson->chip.dev;
+	struct meson_pwm *meson = dev_get_drvdata(dev);
 	unsigned int i;
 	char name[255];
 	int err;
@@ -438,7 +438,7 @@ static int meson_pwm_init_channels(struct meson_pwm *meson)
 		mux_parent_data[i].name = meson->data->parent_names[i];
 	}
 
-	for (i = 0; i < meson->chip.npwm; i++) {
+	for (i = 0; i < MESON_NUM_PWMS; i++) {
 		struct meson_pwm_channel *channel = &meson->channels[i];
 		struct clk_parent_data div_parent = {}, gate_parent = {};
 		struct clk_init_data init = {};
@@ -519,28 +519,35 @@ static int meson_pwm_init_channels(struct meson_pwm *meson)
 static int meson_pwm_probe(struct platform_device *pdev)
 {
 	struct meson_pwm *meson;
+	struct pwm_chip *chip;
 	int err;
 
+	chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
 	meson = devm_kzalloc(&pdev->dev, sizeof(*meson), GFP_KERNEL);
 	if (!meson)
 		return -ENOMEM;
 
+	platform_set_drvdata(pdev, meson);
+
 	meson->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(meson->base))
 		return PTR_ERR(meson->base);
 
 	spin_lock_init(&meson->lock);
-	meson->chip.dev = &pdev->dev;
-	meson->chip.ops = &meson_pwm_ops;
-	meson->chip.npwm = MESON_NUM_PWMS;
+	chip->dev = &pdev->dev;
+	chip->ops = &meson_pwm_ops;
+	chip->npwm = MESON_NUM_PWMS;
 
 	meson->data = of_device_get_match_data(&pdev->dev);
 
-	err = meson_pwm_init_channels(meson);
+	err = meson_pwm_init_channels(&pdev->dev);
 	if (err < 0)
 		return err;
 
-	err = devm_pwmchip_add(&pdev->dev, &meson->chip);
+	err = devm_pwmchip_add(&pdev->dev, chip);
 	if (err < 0)
 		return dev_err_probe(&pdev->dev, err,
 				     "failed to register PWM chip\n");
-- 
2.42.0