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Message-ID: <20231222111658.832167-5-jbrunet@baylibre.com>
Date: Fri, 22 Dec 2023 12:16:52 +0100
From: Jerome Brunet <jbrunet@...libre.com>
To: Thierry Reding <thierry.reding@...il.com>,
Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
Neil Armstrong <neil.armstrong@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>
Cc: Jerome Brunet <jbrunet@...libre.com>,
Kevin Hilman <khilman@...libre.com>,
devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-amlogic@...ts.infradead.org,
linux-pwm@...r.kernel.org,
JunYi Zhao <junyi.zhao@...ogic.com>
Subject: [PATCH v4 4/6] pwm: meson: use device data to carry information around
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@...libre.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
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