[PATCH 10/20] clk: imx: pfd: add set_rate()

Lukasz Majewski
2019-12-08T14:38:04Z

On Wed, 4 Dec 2019 18:44:29 +0100
Giulio Benetti <giulio.benetti@benettiengineering.com> wrote:

> Implement set_rate() for pfd.
>
> Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
> ---
> drivers/clk/imx/clk-pfd.c | 22 ++++++++++++++++++++++
> 1 file changed, 22 insertions(+)
>
> diff --git a/drivers/clk/imx/clk-pfd.c b/drivers/clk/imx/clk-pfd.c
> index 188b2b3b90..4ae55f5a07 100644
> --- a/drivers/clk/imx/clk-pfd.c
> +++ b/drivers/clk/imx/clk-pfd.c
> @@ -52,8 +52,30 @@ static unsigned long clk_pfd_recalc_rate(struct
> clk *clk) return tmp;
> }
>
> +static unsigned long clk_pfd_set_rate(struct clk *clk, unsigned long
> rate) +{
> + struct clk_pfd *pfd = to_clk_pfd(clk);
> + unsigned long parent_rate = clk_get_parent_rate(clk);
> + u64 tmp = parent_rate;
> + u8 frac;
> +
> + tmp = tmp * 18 + rate / 2;
> + do_div(tmp, rate);
> + frac = tmp;
> + if (frac < 12)
> + frac = 12;
> + else if (frac > 35)
> + frac = 35;
> +
> + writel(0x3f << (pfd->idx * 8), pfd->reg + CLR);
> + writel(frac << (pfd->idx * 8), pfd->reg + SET);
> +
> + return 0;
> +}
> +
> static const struct clk_ops clk_pfd_ops = {
> .get_rate = clk_pfd_recalc_rate,
> + .set_rate = clk_pfd_set_rate,
> };
>
> struct clk *imx_clk_pfd(const char *name, const char *parent_name,

Reviewed-by: Lukasz Majewski <lukma@denx.de>

Best regards,

Lukasz Majewski

--

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