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drm/msm/dsi: Don't get byte/pixel source clocks from DT 

We retrieve the byte and pixel source clocks (RCG clocks) in the dsi
driver via DT. These are needed so that we can re-parent these source
clocks if we want to drive it using a different DSI PLL.

We shouldn't get these via DT because they aren't clocks that directly
serve as inputs to the dsi host.

Fortunately, there is a static parent-child link between the
byte_clk_src/pixel_clk_src and byte_clk/pixel_clk clocks. So, we can
retrieve the source clocks via clk_get_parent.

Do this instead of retrieving via DT.

Cc: Rob Herring <robh@kernel.org>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Archit Taneja 2015-11-30 17:47:17 +05:30 committed by Rob Clark
parent af6d0423df
commit e6c4c78c10
1 changed files with 6 additions and 9 deletions
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15
drivers/gpu/drm/msm/dsi/dsi_host.c
View File

@ -356,20 +356,17 @@ static int dsi_clk_init(struct msm_dsi_host *msm_host)
goto exit;
}
msm_host->byte_clk_src = devm_clk_get(dev, "byte_clk_src");
if (IS_ERR(msm_host->byte_clk_src)) {
ret = PTR_ERR(msm_host->byte_clk_src);
msm_host->byte_clk_src = clk_get_parent(msm_host->byte_clk);
if (!msm_host->byte_clk_src) {
ret = -ENODEV;
pr_err("%s: can't find byte_clk_src. ret=%d\n", __func__, ret);
msm_host->byte_clk_src = NULL;
goto exit;
}
msm_host->pixel_clk_src = devm_clk_get(dev, "pixel_clk_src");
if (IS_ERR(msm_host->pixel_clk_src)) {
ret = PTR_ERR(msm_host->pixel_clk_src);
msm_host->pixel_clk_src = clk_get_parent(msm_host->pixel_clk);
if (!msm_host->pixel_clk_src) {
ret = -ENODEV;
pr_err("%s: can't find pixel_clk_src. ret=%d\n", __func__, ret);
msm_host->pixel_clk_src = NULL;
goto exit;
}
exit: