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pwm: sti: Simplify probe function using devm functions 

[ Upstream commit 5bb0b194aeee5d5da6881232f4e9989b35957c25 ]

Instead of of_clk_get_by_name() use devm_clk_get_prepared() which has
several advantages:

 - Combines getting the clock and a call to clk_prepare(). The latter
   can be dropped from sti_pwm_probe() accordingly.
 - Cares for calling clk_put() which is missing in both probe's error
   path and the remove function.
 - Cares for calling clk_unprepare() which can be dropped from the error
   paths and the remove function. (Note that not all error path got this
   right.)

With additionally using devm_pwmchip_add() instead of pwmchip_add() the
remove callback can be dropped completely. With it the last user of
platform_get_drvdata() goes away and so platform_set_drvdata() can be
dropped from the probe function, too.

Fixes: 378fe115d1 ("pwm: sti: Add new driver for ST's PWM IP")
Link: https://lore.kernel.org/r/81f0e1d173652f435afda6719adaed1922fe059a.1710068192.git.u.kleine-koenig@pengutronix.de
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Uwe Kleine-König 2024-03-10 12:00:54 +01:00 committed by Greg Kroah-Hartman
parent cedd7e5369
commit a80814fe91
1 changed files with 3 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
drivers/pwm/pwm-sti.c
View File

@ -625,32 +625,20 @@ static int sti_pwm_probe(struct platform_device *pdev)
return ret;
if (cdata->pwm_num_devs) {
pc->pwm_clk = of_clk_get_by_name(dev->of_node, "pwm");
pc->pwm_clk = devm_clk_get_prepared(dev, "pwm");
if (IS_ERR(pc->pwm_clk)) {
dev_err(dev, "failed to get PWM clock\n");
return PTR_ERR(pc->pwm_clk);
}
ret = clk_prepare(pc->pwm_clk);
if (ret) {
dev_err(dev, "failed to prepare clock\n");
return ret;
}
}
if (cdata->cpt_num_devs) {
pc->cpt_clk = of_clk_get_by_name(dev->of_node, "capture");
pc->cpt_clk = devm_clk_get_prepared(dev, "capture");
if (IS_ERR(pc->cpt_clk)) {
dev_err(dev, "failed to get PWM capture clock\n");
return PTR_ERR(pc->cpt_clk);
}
ret = clk_prepare(pc->cpt_clk);
if (ret) {
dev_err(dev, "failed to prepare clock\n");
return ret;
}
cdata->ddata = devm_kzalloc(dev, cdata->cpt_num_devs * sizeof(*cdata->ddata), GFP_KERNEL);
if (!cdata->ddata)
return -ENOMEM;
@ -667,27 +655,7 @@ static int sti_pwm_probe(struct platform_device *pdev)
mutex_init(&ddata->lock);
}
ret = pwmchip_add(chip);
if (ret < 0) {
clk_unprepare(pc->pwm_clk);
clk_unprepare(pc->cpt_clk);
return ret;
}
platform_set_drvdata(pdev, chip);
return 0;
}
static void sti_pwm_remove(struct platform_device *pdev)
{
struct pwm_chip *chip = platform_get_drvdata(pdev);
struct sti_pwm_chip *pc = to_sti_pwmchip(chip);
pwmchip_remove(chip);
clk_unprepare(pc->pwm_clk);
clk_unprepare(pc->cpt_clk);
return devm_pwmchip_add(dev, chip);
}
static const struct of_device_id sti_pwm_of_match[] = {
@ -702,7 +670,6 @@ static struct platform_driver sti_pwm_driver = {
.of_match_table = sti_pwm_of_match,
},
.probe = sti_pwm_probe,
.remove_new = sti_pwm_remove,
};
module_platform_driver(sti_pwm_driver);