[PATCH 1/3] clk: mediatek: clk-mtk: Grab iomem pointer for divider clocks

[Chen-Yu Tsai]

On Thu, Jun 15, 2023 at 8:21 PM AngeloGioacchino Del Regno
<angelogioacchino.delregno at collabora.com> wrote:
>
> In the rare case in which one of the clock drivers has divider clocks
> but not composite clocks, mtk_clk_simple_probe() would not io(re)map,
> hence passing a NULL pointer to mtk_clk_register_dividers().
>
> To fix this issue, extend the `if` conditional to also check if any
> divider clocks are present. While at it, also make sure the iomem
> pointer is NULL if no composite/divider clocks are declared, as we
> are checking for that when iounmapping it in the error path.
>
> This hasn't been seen on any MediaTek clock driver as the current ones
> always declare composite clocks along with divider clocks, but this is
> still an important fix for a future potential KP.
>
> Fixes: 1fe074b1f112 ("clk: mediatek: Add divider clocks to mtk_clk_simple_{probe,remove}()")
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>

Reviewed-by: Chen-Yu Tsai <wenst at chromium.org>