Hi Shimoda-san,
On Thu, May 21, 2015 at 4:50 AM, Yoshihiro Shimoda
<yoshihiro.shimoda.uh@xxxxxxxxxxx> wrote:
> This patch adds support for R-Car SoCs PWM Timer.
Thanks for your patch!
> --- /dev/null
> +++ b/drivers/pwm/pwm-rcar.c
> +#define RCAR_PWM_CH_OFFSET 0x1000
This is no longer used, now each pwm instance has its own device node.
> +static void rcar_pwm_set_counter(struct rcar_pwm_chip *rp, int div,
> + int duty_ns, int period_ns)
> +{
> + unsigned long long one_cycle, tmp; /* 0.01 nanoseconds */
> + unsigned long clk_rate = clk_get_rate(rp->clk);
> + u32 cyc, ph;
> +
> + one_cycle = (unsigned long long)NSEC_PER_SEC * 100 * (1 << div);
> + do_div(one_cycle, clk_rate);
> +
> + tmp = period_ns * 100;
period_ns and the constant 100 are both int, hence the multiplication may
still overflow.
Please use e.g. "tmp = period_ns * 100ULL" instead.
> + do_div(tmp, one_cycle);
> + cyc = ((u32)tmp << RCAR_PWMCNT_CYC0_SHIFT) & RCAR_PWMCNT_CYC0_MASK;
I think the cast is not needed.
> +
> + tmp = duty_ns * 100;
Same here: "tmp = duty_ns * 100ULL;".
> + do_div(tmp, one_cycle);
> + ph = (u32)tmp & RCAR_PWMCNT_PH0_MASK;
I think the cast is not needed.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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