linux-kernel - [PATCH v2 14/17] clk: imx: imx8qxp: Add clock muxes for MIPI and PHY ref clocks

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Date: Fri, 10 May 2024 17:19:09 +0800
From: "Peng Fan (OSS)" <peng.fan@....nxp.com>
To: Abel Vesa <abelvesa@...nel.org>, 
 Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, Jacky Bai <ping.bai@....com>, 
 Ye Li <ye.li@....com>, Dong Aisheng <aisheng.dong@....com>
Cc: linux-clk@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Abel Vesa <abel.vesa@...aro.org>, Peng Fan <peng.fan@....com>, 
 "Oliver F. Brown" <oliver.brown@....nxp.com>, 
 Robert Chiras <robert.chiras@....com>
Subject: [PATCH v2 14/17] clk: imx: imx8qxp: Add clock muxes for MIPI and
 PHY ref clocks

From: "Oliver F. Brown" <oliver.brown@....nxp.com>

The MIPI Pixel and PHY Reference can use the bypass clock as a source. The
MIPI bypass clock is the Pixel clock from the Display controller via the
pixel link. Using the pixel clock for the PHY reference allows the MIPI bit
clock match the pixel rate exactly.

The MIPI pixel clock is currently set to be source from the bypass clock in
the SCFW. This patch allows the pixel clock parent to be set by the kernel
in the event that the SCFW default clock parent may change in the future.

Signed-off-by: Oliver F. Brown <oliver.brown@....nxp.com>
Signed-off-by: Robert Chiras <robert.chiras@....com>
Signed-off-by: Peng Fan <peng.fan@....com>
---
 drivers/clk/imx/clk-imx8qxp.c | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/drivers/clk/imx/clk-imx8qxp.c b/drivers/clk/imx/clk-imx8qxp.c
index a0654edaae83..fe6509be6ce9 100644
--- a/drivers/clk/imx/clk-imx8qxp.c
+++ b/drivers/clk/imx/clk-imx8qxp.c
@@ -90,6 +90,22 @@ static const char * const mipi_sels[] = {
 	"clk_dummy",
 };
 
+static const char * const mipi0_phy_sels[] = {
+	"clk_dummy",
+	"clk_dummy",
+	"mipi_pll_div2_clk",
+	"clk_dummy",
+	"mipi0_bypass_clk",
+};
+
+static const char * const mipi1_phy_sels[] = {
+	"clk_dummy",
+	"clk_dummy",
+	"mipi_pll_div2_clk",
+	"clk_dummy",
+	"mipi1_bypass_clk",
+};
+
 static const char * const lcd_sels[] = {
 	"clk_dummy",
 	"clk_dummy",
@@ -222,25 +238,25 @@ static int imx8qxp_clk_probe(struct platform_device *pdev)
 
 	/* MIPI-LVDS SS */
 	imx_clk_scu("mipi0_bypass_clk", IMX_SC_R_MIPI_0, IMX_SC_PM_CLK_BYPASS);
-	imx_clk_scu("mipi0_pixel_clk", IMX_SC_R_MIPI_0, IMX_SC_PM_CLK_PER);
+	imx_clk_scu2("mipi0_pixel_clk", mipi0_phy_sels, ARRAY_SIZE(mipi0_phy_sels), IMX_SC_R_MIPI_0, IMX_SC_PM_CLK_PER);
 	imx_clk_scu("lvds0_bypass_clk", IMX_SC_R_LVDS_0, IMX_SC_PM_CLK_BYPASS);
 	imx_clk_scu2("lvds0_pixel_clk", lvds0_sels, ARRAY_SIZE(lvds0_sels), IMX_SC_R_LVDS_0, IMX_SC_PM_CLK_MISC2);
 	imx_clk_scu2("lvds0_phy_clk", lvds0_sels, ARRAY_SIZE(lvds0_sels), IMX_SC_R_LVDS_0, IMX_SC_PM_CLK_MISC3);
 	imx_clk_scu2("mipi0_dsi_tx_esc_clk", mipi_sels, ARRAY_SIZE(mipi_sels), IMX_SC_R_MIPI_0, IMX_SC_PM_CLK_MST_BUS);
 	imx_clk_scu2("mipi0_dsi_rx_esc_clk", mipi_sels, ARRAY_SIZE(mipi_sels), IMX_SC_R_MIPI_0, IMX_SC_PM_CLK_SLV_BUS);
-	imx_clk_scu2("mipi0_dsi_phy_clk", mipi_sels, ARRAY_SIZE(mipi_sels), IMX_SC_R_MIPI_0, IMX_SC_PM_CLK_PHY);
+	imx_clk_scu2("mipi0_dsi_phy_clk", mipi0_phy_sels, ARRAY_SIZE(mipi0_phy_sels), IMX_SC_R_MIPI_0, IMX_SC_PM_CLK_PHY);
 	imx_clk_scu("mipi0_i2c0_clk", IMX_SC_R_MIPI_0_I2C_0, IMX_SC_PM_CLK_MISC2);
 	imx_clk_scu("mipi0_i2c1_clk", IMX_SC_R_MIPI_0_I2C_1, IMX_SC_PM_CLK_MISC2);
 	imx_clk_scu("mipi0_pwm0_clk", IMX_SC_R_MIPI_0_PWM_0, IMX_SC_PM_CLK_PER);
 
 	imx_clk_scu("mipi1_bypass_clk", IMX_SC_R_MIPI_1, IMX_SC_PM_CLK_BYPASS);
-	imx_clk_scu("mipi1_pixel_clk", IMX_SC_R_MIPI_1, IMX_SC_PM_CLK_PER);
+	imx_clk_scu2("mipi1_pixel_clk", mipi1_phy_sels, ARRAY_SIZE(mipi1_phy_sels), IMX_SC_R_MIPI_1, IMX_SC_PM_CLK_PER);
 	imx_clk_scu("lvds1_bypass_clk", IMX_SC_R_LVDS_1, IMX_SC_PM_CLK_BYPASS);
 	imx_clk_scu2("lvds1_pixel_clk", lvds1_sels, ARRAY_SIZE(lvds1_sels), IMX_SC_R_LVDS_1, IMX_SC_PM_CLK_MISC2);
 	imx_clk_scu2("lvds1_phy_clk", lvds1_sels, ARRAY_SIZE(lvds1_sels), IMX_SC_R_LVDS_1, IMX_SC_PM_CLK_MISC3);
 	imx_clk_scu2("mipi1_dsi_tx_esc_clk", mipi_sels, ARRAY_SIZE(mipi_sels), IMX_SC_R_MIPI_1, IMX_SC_PM_CLK_MST_BUS);
 	imx_clk_scu2("mipi1_dsi_rx_esc_clk", mipi_sels, ARRAY_SIZE(mipi_sels), IMX_SC_R_MIPI_1, IMX_SC_PM_CLK_SLV_BUS);
-	imx_clk_scu2("mipi1_dsi_phy_clk", mipi_sels, ARRAY_SIZE(mipi_sels), IMX_SC_R_MIPI_1, IMX_SC_PM_CLK_PHY);
+	imx_clk_scu2("mipi1_dsi_phy_clk", mipi1_phy_sels, ARRAY_SIZE(mipi1_phy_sels), IMX_SC_R_MIPI_1, IMX_SC_PM_CLK_PHY);
 	imx_clk_scu("mipi1_i2c0_clk", IMX_SC_R_MIPI_1_I2C_0, IMX_SC_PM_CLK_MISC2);
 	imx_clk_scu("mipi1_i2c1_clk", IMX_SC_R_MIPI_1_I2C_1, IMX_SC_PM_CLK_MISC2);
 	imx_clk_scu("mipi1_pwm0_clk", IMX_SC_R_MIPI_1_PWM_0, IMX_SC_PM_CLK_PER);

-- 
2.37.1