On 23.06.2017 08:08, Zhi Mao wrote:
> Replace "7" with "PWM_CLK_DIV_MAX" in function:mtk_pwm_config()
> to improve the code readablity.
>
> Signed-off-by: Zhi Mao <zhi.mao@xxxxxxxxxxxx>
> ---
> drivers/pwm/pwm-mediatek.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/pwm/pwm-mediatek.c b/drivers/pwm/pwm-mediatek.c
> index 554a042..e5f6425 100644
> --- a/drivers/pwm/pwm-mediatek.c
> +++ b/drivers/pwm/pwm-mediatek.c
> @@ -30,6 +30,8 @@
> #define PWMDWIDTH 0x2c
> #define PWMTHRES 0x30
>
> +#define PWM_CLK_DIV_MAX 7
> +
> enum {
> MTK_CLK_MAIN = 0,
> MTK_CLK_TOP,
> @@ -130,8 +132,10 @@ static int mtk_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
> clkdiv++;
> }
>
> - if (clkdiv > 7)
> + if (clkdiv > PWM_CLK_DIV_MAX) {
You forgot to:
mtk_pwm_clk_disable(chip, pwm);
> + dev_err(chip->dev, "period %d not supported\n", period_ns);
> return -EINVAL;
> + }
>
> mtk_pwm_writel(pc, pwm->hwpwm, PWMCON, BIT(15) | clkdiv);
> mtk_pwm_writel(pc, pwm->hwpwm, PWMDWIDTH, period_ns / resolution);
>
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