[PATCH 1/5] video: mxsfb: add enabling of "axi" clock other than "per" clock

[Giulio Benetti]

On some SoC mxsfb needs more than one clock gate(actual "per" clock). So
let's introduce "axi" clock that can be provided but it's not mandatory.
This is inspired from linux mxsfb driver. Also let's rename "per" clock to
"pix" clock for compatibility with already existing .dts lcdif nodes
implementation.

Signed-off-by: Giulio Benetti <giulio.benetti at benettiengineering.com>
---
 drivers/video/mxsfb.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/drivers/video/mxsfb.c b/drivers/video/mxsfb.c
index e1fd36a62d..147bd668fe 100644
--- a/drivers/video/mxsfb.c
+++ b/drivers/video/mxsfb.c
@@ -67,26 +67,37 @@ static void mxs_lcd_init(struct udevice *dev, u32 fb_addr,
 	uint32_t vdctrl0;
 
 #if CONFIG_IS_ENABLED(CLK)
-	struct clk per_clk;
+	struct clk clk;
 	int ret;
 
-	ret = clk_get_by_name(dev, "per", &per_clk);
+	ret = clk_get_by_name(dev, "pix", &clk);
 	if (ret) {
-		dev_err(dev, "Failed to get mxs clk: %d\n", ret);
+		dev_err(dev, "Failed to get mxs pix clk: %d\n", ret);
 		return;
 	}
 
-	ret = clk_set_rate(&per_clk, timings->pixelclock.typ);
+	ret = clk_set_rate(&clk, timings->pixelclock.typ);
 	if (ret < 0) {
-		dev_err(dev, "Failed to set mxs clk: %d\n", ret);
+		dev_err(dev, "Failed to set mxs pix clk: %d\n", ret);
 		return;
 	}
 
-	ret = clk_enable(&per_clk);
+	ret = clk_enable(&clk);
 	if (ret < 0) {
-		dev_err(dev, "Failed to enable mxs clk: %d\n", ret);
+		dev_err(dev, "Failed to enable mxs pix clk: %d\n", ret);
 		return;
 	}
+
+	ret = clk_get_by_name(dev, "axi", &clk);
+	if (!ret) {
+		debug("%s: Failed to get mxs axi clk: %d\n", __func__, ret);
+	} else {
+		ret = clk_enable(&clk);
+		if (ret < 0) {
+			dev_err(dev, "Failed to enable mxs axi clk: %d\n", ret);
+			return;
+		}
+	}
 #else
 	/* Kick in the LCDIF clock */
 	mxs_set_lcdclk(MXS_LCDIF_BASE, timings->pixelclock.typ / 1000);
-- 
2.25.1