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pwm: atmel: Use a constant for maximum prescale value 

The maximal prescale value is 10 for all supported variants. So drop the
member in the variant description and introduce a global constant
instead.

This reduces the size of the variant descriptions and the .apply()
callback can be compiled a bit more effectively.

Acked-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Uwe Kleine-König 2019-08-24 02:10:37 +02:00 committed by Thierry Reding
parent 3c269ba6d8
commit ff55e7a314
1 changed files with 3 additions and 5 deletions
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8
drivers/pwm/pwm-atmel.c
View File

@ -50,6 +50,8 @@
#define PWMV2_CPRD 0x0C
#define PWMV2_CPRDUPD 0x10
#define PWM_MAX_PRES 10
struct atmel_pwm_registers {
u8 period;
u8 period_upd;
@ -59,7 +61,6 @@ struct atmel_pwm_registers {
struct atmel_pwm_config {
u32 max_period;
u32 max_pres;
};
struct atmel_pwm_data {
@ -126,7 +127,7 @@ static int atmel_pwm_calculate_cprd_and_pres(struct pwm_chip *chip,
for (*pres = 0; cycles > atmel_pwm->data->cfg.max_period; cycles >>= 1)
(*pres)++;
if (*pres > atmel_pwm->data->cfg.max_pres) {
if (*pres > PWM_MAX_PRES) {
dev_err(chip->dev, "pres exceeds the maximum value\n");
return -EINVAL;
}
@ -289,7 +290,6 @@ static const struct atmel_pwm_data atmel_sam9rl_pwm_data = {
.cfg = {
/* 16 bits to keep period and duty. */
.max_period = 0xffff,
.max_pres = 10,
},
};
@ -303,7 +303,6 @@ static const struct atmel_pwm_data atmel_sama5_pwm_data = {
.cfg = {
/* 16 bits to keep period and duty. */
.max_period = 0xffff,
.max_pres = 10,
},
};
@ -317,7 +316,6 @@ static const struct atmel_pwm_data mchp_sam9x60_pwm_data = {
.cfg = {
/* 32 bits to keep period and duty. */
.max_period = 0xffffffff,
.max_pres = 10,
},
};