Make the pll-clock-frequency optional. If it's present, use it
to maintain backwards compatibility with existing hardware. If it
is absent, read clock rate of "sclk_mipi" to determine the rate.
Signed-off-by: Adam Ford <aford173@xxxxxxxxx>
Tested-by: Chen-Yu Tsai <wenst@xxxxxxxxxxxx>
---
drivers/gpu/drm/bridge/samsung-dsim.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/bridge/samsung-dsim.c b/drivers/gpu/drm/bridge/samsung-dsim.c
index bf4b33d2de76..2dc02a9e37c0 100644
--- a/drivers/gpu/drm/bridge/samsung-dsim.c
+++ b/drivers/gpu/drm/bridge/samsung-dsim.c
@@ -1726,12 +1726,20 @@ static int samsung_dsim_parse_dt(struct samsung_dsim *dsi)
{
struct device *dev = dsi->dev;
struct device_node *node = dev->of_node;
+ struct clk *pll_clk;
int ret;
ret = samsung_dsim_of_read_u32(node, "samsung,pll-clock-frequency",
&dsi->pll_clk_rate);
- if (ret < 0)
- return ret;
+
+ /* If it doesn't exist, read it from the clock instead of failing */
+ if (ret < 0) {
+ pll_clk = devm_clk_get(dev, "sclk_mipi");
+ if (!IS_ERR(pll_clk))
+ dsi->pll_clk_rate = clk_get_rate(pll_clk);
+ else
+ return PTR_ERR(pll_clk);
+ }
ret = samsung_dsim_of_read_u32(node, "samsung,burst-clock-frequency",
&dsi->burst_clk_rate);
--
2.39.2
