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pwm: atmel-tcb: Put per-channel data into driver data

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[ Upstream commit 78dca23bd6 ]

This simplifies the code, reduces the number of memory allocations and
pointer dereferences.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Claudiu Beznea <claudiu.beznea@tuxon.dev>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Stable-dep-of: 37f7707077f5 ("pwm: atmel-tcb: Fix race condition and convert to guards")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Uwe Kleine-König
2023-07-19 21:20:11 +02:00
committed by Greg Kroah-Hartman
parent 235af017a7
commit 49ed37d65e
1 changed files with 9 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
drivers/pwm/pwm-atmel-tcb.c
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@@ -57,7 +57,7 @@ struct atmel_tcb_pwm_chip {
struct clk *clk;
struct clk *gclk;
struct clk *slow_clk;
struct atmel_tcb_pwm_device *pwms[NPWM];
struct atmel_tcb_pwm_device pwms[NPWM];
struct atmel_tcb_channel bkup;
};
@@ -73,7 +73,7 @@ static int atmel_tcb_pwm_set_polarity(struct pwm_chip *chip,
enum pwm_polarity polarity)
{
struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm];
struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm];
tcbpwm->polarity = polarity;
@@ -84,19 +84,13 @@ static int atmel_tcb_pwm_request(struct pwm_chip *chip,
struct pwm_device *pwm)
{
struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
struct atmel_tcb_pwm_device *tcbpwm;
struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm];
unsigned cmr;
int ret;
tcbpwm = devm_kzalloc(chip->dev, sizeof(*tcbpwm), GFP_KERNEL);
if (!tcbpwm)
return -ENOMEM;
ret = clk_prepare_enable(tcbpwmc->clk);
if (ret) {
devm_kfree(chip->dev, tcbpwm);
if (ret)
return ret;
}
tcbpwm->polarity = PWM_POLARITY_NORMAL;
tcbpwm->duty = 0;
@@ -131,25 +125,20 @@ static int atmel_tcb_pwm_request(struct pwm_chip *chip,
regmap_write(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CMR), cmr);
spin_unlock(&tcbpwmc->lock);
tcbpwmc->pwms[pwm->hwpwm] = tcbpwm;
return 0;
}
static void atmel_tcb_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm];
clk_disable_unprepare(tcbpwmc->clk);
tcbpwmc->pwms[pwm->hwpwm] = NULL;
devm_kfree(chip->dev, tcbpwm);
}
static void atmel_tcb_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm];
struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm];
unsigned cmr;
enum pwm_polarity polarity = tcbpwm->polarity;
@@ -206,7 +195,7 @@ static void atmel_tcb_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
static int atmel_tcb_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm];
struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm];
u32 cmr;
enum pwm_polarity polarity = tcbpwm->polarity;
@@ -291,7 +280,7 @@ static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
int duty_ns, int period_ns)
{
struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm];
struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm];
struct atmel_tcb_pwm_device *atcbpwm = NULL;
int i = 0;
int slowclk = 0;
@@ -338,9 +327,9 @@ static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
period = div_u64(period_ns, min);
if (pwm->hwpwm == 0)
atcbpwm = tcbpwmc->pwms[1];
atcbpwm = &tcbpwmc->pwms[1];
else
atcbpwm = tcbpwmc->pwms[0];
atcbpwm = &tcbpwmc->pwms[0];
/*
* PWM devices provided by the TCB driver are grouped by 2.