[PATCH 03/18] clk: imx: clk-imxrt1050: setup PLL5 for video in non-SPL

[Fabio Estevam]

Hi Giulio,

On Wed, Feb 26, 2020 at 2:16 PM Giulio Benetti
<giulio.benetti at benettiengineering.com> wrote:
>
> mxsfb needs PLL5 as source, so let's setup it and set it as source for
> mxsfb(lcdif).
>
> Signed-off-by: Giulio Benetti <giulio.benetti at benettiengineering.com>
> ---
>  drivers/clk/imx/clk-imxrt1050.c | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/clk/imx/clk-imxrt1050.c b/drivers/clk/imx/clk-imxrt1050.c
> index e33d426363..2819ffb9ac 100644
> --- a/drivers/clk/imx/clk-imxrt1050.c
> +++ b/drivers/clk/imx/clk-imxrt1050.c
> @@ -238,9 +238,9 @@ static int imxrt1050_clk_probe(struct udevice *dev)
>         clk_dm(IMXRT1050_CLK_LCDIF,
>                imx_clk_gate2("lcdif", "lcdif_podf", base + 0x70, 28));
>
> -#ifdef CONFIG_SPL_BUILD
>         struct clk *clk, *clk1;
>
> +#ifdef CONFIG_SPL_BUILD
>         /* bypass pll1 before setting its rate */
>         clk_get_by_id(IMXRT1050_CLK_PLL1_REF_SEL, &clk);
>         clk_get_by_id(IMXRT1050_CLK_PLL1_BYPASS, &clk1);
> @@ -271,7 +271,18 @@ static int imxrt1050_clk_probe(struct udevice *dev)
>
>         clk_get_by_id(IMXRT1050_CLK_PLL3_BYPASS, &clk1);
>         clk_set_parent(clk1, clk);
> +#else
> +       /* Set PLL5 for LCDIF to its default 650Mhz */
> +       clk_get_by_id(IMXRT1050_CLK_PLL5_VIDEO, &clk);
> +       clk_enable(clk);
> +       clk_set_rate(clk, 650000000UL);
> +
> +       clk_get_by_id(IMXRT1050_CLK_PLL5_BYPASS, &clk1);
> +       clk_set_parent(clk1, clk);
>
> +       /* Configure PLL5 as LCDIF source */
> +       clk_get_by_id(IMXRT1050_CLK_LCDIF_SEL, &clk1);
> +       clk_set_parent(clk1, clk);

This is more like a board design decision and IMHO should not be
hardcoded as part of the clock driver.

Other users may want to use a different clock source for the eLCDIF driver.

Setting the clock parent in board device tree makes more sense.