[V3,3/4] clk: imx8mm: Let IMX8MM_CLK_LCDIF_PIXEL set parent rate

Commit Message

Adam Ford March 23, 2023, 10:51 p.m. UTC

By default the display pixel clock needs to be evenly divide
down from 594MHz which rules out a significant number of
resolution and refresh rates.
The current clock tree looks something like:

video_pll1                  594000000
  video_pll1_bypass         594000000
     video_pll1_out         594000000
        lcdif_pixel         148500000

Now that composite-8m supports determine_rate, we can allow
lcdif_pixel to set the parent rate which then switches
every clock in the chain to a new frequency when lcdif_pixel
cannot evenly divide from video_pll1_out.

Signed-off-by: Adam Ford <[e-mail]>
Reviewed-by: Fabio Estevam <[e-mail]>

Patch

diff --git a/drivers/clk/imx/clk-imx8mm.c b/drivers/clk/imx/clk-imx8mm.c
index b618892170f2..075f643e3f35 100644
--- a/drivers/clk/imx/clk-imx8mm.c
+++ b/drivers/clk/imx/clk-imx8mm.c
@@ -468,7 +468,7 @@  static int imx8mm_clocks_probe(struct platform_device *pdev)
 	hws[IMX8MM_CLK_PCIE1_PHY] = imx8m_clk_hw_composite("pcie1_phy", imx8mm_pcie1_phy_sels, base + 0xa380);
 	hws[IMX8MM_CLK_PCIE1_AUX] = imx8m_clk_hw_composite("pcie1_aux", imx8mm_pcie1_aux_sels, base + 0xa400);
 	hws[IMX8MM_CLK_DC_PIXEL] = imx8m_clk_hw_composite("dc_pixel", imx8mm_dc_pixel_sels, base + 0xa480);
-	hws[IMX8MM_CLK_LCDIF_PIXEL] = imx8m_clk_hw_composite("lcdif_pixel", imx8mm_lcdif_pixel_sels, base + 0xa500);
+	hws[IMX8MM_CLK_LCDIF_PIXEL] = imx8m_clk_hw_composite_flags("lcdif_pixel", imx8mm_lcdif_pixel_sels, base + 0xa500, CLK_SET_RATE_PARENT);
 	hws[IMX8MM_CLK_SAI1] = imx8m_clk_hw_composite("sai1", imx8mm_sai1_sels, base + 0xa580);
 	hws[IMX8MM_CLK_SAI2] = imx8m_clk_hw_composite("sai2", imx8mm_sai2_sels, base + 0xa600);
 	hws[IMX8MM_CLK_SAI3] = imx8m_clk_hw_composite("sai3", imx8mm_sai3_sels, base + 0xa680);