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clk: imx: imx6sx: Allow a different LCDIF1 clock parent

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It is not a good idea to hardcode the LCDIF1 parent inside the
clock driver because some users may want to use a different clock
parent for LCDIF1. One of the reasons could be related to EMI tests.

Remove the harcoded LCDIF1 parent when the LCDIF1 parent is described
via devicetree.

Old dtb's that do not describe the LCDIF1 parent via devicetree will
use the same PLL5 clock as parent to keep the original behavior.

Signed-off-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
Link: https://lore.kernel.org/r/20230815130923.775117-1-festevam@gmail.com
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
This commit is contained in:
Fabio Estevam 2023-08-15 10:09:23 -03:00 committed by Abel Vesa
parent 577ad16996
commit 0a22b3a6f4
1 changed files with 11 additions and 3 deletions
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14
drivers/clk/imx/clk-imx6sx.c
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@ -121,6 +121,7 @@ static void __init imx6sx_clocks_init(struct device_node *ccm_node)
{
struct device_node *np;
void __iomem *base;
bool lcdif1_assigned_clk;
clk_hw_data = kzalloc(struct_size(clk_hw_data, hws,
IMX6SX_CLK_CLK_END), GFP_KERNEL);
@ -498,9 +499,16 @@ static void __init imx6sx_clocks_init(struct device_node *ccm_node)
clk_set_parent(hws[IMX6SX_CLK_EIM_SLOW_SEL]->clk, hws[IMX6SX_CLK_PLL2_PFD2]->clk);
clk_set_rate(hws[IMX6SX_CLK_EIM_SLOW]->clk, 132000000);
/* set parent clock for LCDIF1 pixel clock */
clk_set_parent(hws[IMX6SX_CLK_LCDIF1_PRE_SEL]->clk, hws[IMX6SX_CLK_PLL5_VIDEO_DIV]->clk);
clk_set_parent(hws[IMX6SX_CLK_LCDIF1_SEL]->clk, hws[IMX6SX_CLK_LCDIF1_PODF]->clk);
np = of_find_node_by_path("/soc/bus@2200000/spba-bus@2240000/lcdif@2220000");
lcdif1_assigned_clk = of_find_property(np, "assigned-clock-parents", NULL);
/* Set parent clock for LCDIF1 pixel clock if not done via devicetree */
if (!lcdif1_assigned_clk) {
clk_set_parent(hws[IMX6SX_CLK_LCDIF1_PRE_SEL]->clk,
hws[IMX6SX_CLK_PLL5_VIDEO_DIV]->clk);
clk_set_parent(hws[IMX6SX_CLK_LCDIF1_SEL]->clk,
hws[IMX6SX_CLK_LCDIF1_PODF]->clk);
}
/* Set the parent clks of PCIe lvds1 and pcie_axi to be pcie ref, axi */
if (clk_set_parent(hws[IMX6SX_CLK_LVDS1_SEL]->clk, hws[IMX6SX_CLK_PCIE_REF_125M]->clk))