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clk: mediatek: clk-mtk: Grab iomem pointer for divider clocks 

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: 1fe074b1f1 ("clk: mediatek: Add divider clocks to mtk_clk_simple_{probe,remove}()")
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20230615122051.546985-2-angelogioacchino.delregno@collabora.com
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Markus Schneider-Pargmann <msp@baylibre.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
This commit is contained in:
AngeloGioacchino Del Regno 2023-06-15 14:20:49 +02:00 committed by Stephen Boyd
parent 3db7285e04
commit 51821765e8
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/clk/mediatek/clk-mtk.c
View File

@ -469,7 +469,7 @@ static int __mtk_clk_simple_probe(struct platform_device *pdev,
const struct platform_device_id *id;
const struct mtk_clk_desc *mcd;
struct clk_hw_onecell_data *clk_data;
void __iomem *base;
void __iomem *base = NULL;
int num_clks, r;
mcd = device_get_match_data(&pdev->dev);
@ -483,8 +483,8 @@ static int __mtk_clk_simple_probe(struct platform_device *pdev,
return -EINVAL;
}
/* Composite clocks needs us to pass iomem pointer */
if (mcd->composite_clks) {
/* Composite and divider clocks needs us to pass iomem pointer */
if (mcd->composite_clks || mcd->divider_clks) {
if (!mcd->shared_io)
base = devm_platform_ioremap_resource(pdev, 0);
else