diff options
Diffstat (limited to 'drivers/pwm/pwm-atmel.c')
| -rw-r--r-- | drivers/pwm/pwm-atmel.c | 34 |
1 files changed, 23 insertions, 11 deletions
diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c index 7e86a5266eb6..647d063562db 100644 --- a/drivers/pwm/pwm-atmel.c +++ b/drivers/pwm/pwm-atmel.c @@ -48,15 +48,11 @@ #define PWMV2_CPRD 0x0C #define PWMV2_CPRDUPD 0x10 -/* - * Max value for duty and period - * - * Although the duty and period register is 32 bit, - * however only the LSB 16 bits are significant. - */ -#define PWM_MAX_DTY 0xFFFF -#define PWM_MAX_PRD 0xFFFF -#define PRD_MAX_PRES 10 +/* Max values for period and prescaler */ + +/* Only the LSB 16 bits are significant. */ +#define PWM_MAXV1_PRD 0xFFFF +#define PRD_MAXV1_PRES 10 struct atmel_pwm_registers { u8 period; @@ -65,8 +61,14 @@ struct atmel_pwm_registers { u8 duty_upd; }; +struct atmel_pwm_config { + u32 max_period; + u32 max_pres; +}; + struct atmel_pwm_data { struct atmel_pwm_registers regs; + struct atmel_pwm_config cfg; }; struct atmel_pwm_chip { @@ -125,10 +127,10 @@ static int atmel_pwm_calculate_cprd_and_pres(struct pwm_chip *chip, cycles *= clk_get_rate(atmel_pwm->clk); do_div(cycles, NSEC_PER_SEC); - for (*pres = 0; cycles > PWM_MAX_PRD; cycles >>= 1) + for (*pres = 0; cycles > atmel_pwm->data->cfg.max_period; cycles >>= 1) (*pres)++; - if (*pres > PRD_MAX_PRES) { + if (*pres > atmel_pwm->data->cfg.max_pres) { dev_err(chip->dev, "pres exceeds the maximum value\n"); return -EINVAL; } @@ -288,6 +290,11 @@ static const struct atmel_pwm_data atmel_pwm_data_v1 = { .duty = PWMV1_CDTY, .duty_upd = PWMV1_CUPD, }, + .cfg = { + /* 16 bits to keep period and duty. */ + .max_period = PWM_MAXV1_PRD, + .max_pres = PRD_MAXV1_PRES, + }, }; static const struct atmel_pwm_data atmel_pwm_data_v2 = { @@ -297,6 +304,11 @@ static const struct atmel_pwm_data atmel_pwm_data_v2 = { .duty = PWMV2_CDTY, .duty_upd = PWMV2_CDTYUPD, }, + .cfg = { + /* 16 bits to keep period and duty. */ + .max_period = PWM_MAXV1_PRD, + .max_pres = PRD_MAXV1_PRES, + }, }; static const struct platform_device_id atmel_pwm_devtypes[] = { |