[PATCH 3/7 v2] video: ARM CLCD: support DT signal inversion flags

The device tree bindings from display-timing.txt allows us to
specify if data enable, hsync, vsync or the pixed clock should be
inverted on the way to the display. The driver does not currently
handle this so add support for those flags as it is needed for
the Versatile Sanyo LCD display.

Note that the previous behaviour was to invert the pixel clock
for all displays, so unless the pixel clock polarity is
explicitly defined in the device tree (i.e. the timings node
has the "pixelclk-active" property) we fall back to inverting
the pixel clock. This needs some extra compatibility code.

Since the timing flags have to be set up inside the struct
clcd_panel, we need to refactor the code a bit to pass around
the panel rather than just the mode.

Cc: Pawel Moll <redacted>
Cc: Rob Herring <robh@kernel.org>
Cc: Russell King <redacted>
Signed-off-by: Linus Walleij <redacted>
---
ChangeLog v1->v2:
- No changes. Just reposting.
---
 drivers/video/fbdev/amba-clcd.c | 41 ++++++++++++++++++++++++++++++++++-------
 1 file changed, 34 insertions(+), 7 deletions(-)

diff --git a/drivers/video/fbdev/amba-clcd.c b/drivers/video/fbdev/amba-clcd.c
index c5d1e9ca81ab..8903a42c4122 100644
--- a/drivers/video/fbdev/amba-clcd.c
+++ b/drivers/video/fbdev/amba-clcd.c

@@ -567,10 +567,11 @@ static int clcdfb_register(struct clcd_fb *fb)
 
 #ifdef CONFIG_OF
 static int clcdfb_of_get_dpi_panel_mode(struct device_node *node,
-		struct fb_videomode *mode)
+		struct clcd_panel *clcd_panel)
 {
 	int err;
 	struct display_timing timing;
+	struct device_node *timnp;
 	struct videomode video;
 
 	err = of_get_display_timing(node, "panel-timing", &timing);

@@ -579,10 +580,34 @@ static int clcdfb_of_get_dpi_panel_mode(struct device_node *node,
 
 	videomode_from_timing(&timing, &video);
 
-	err = fb_videomode_from_videomode(&video, mode);
+	err = fb_videomode_from_videomode(&video, &clcd_panel->mode);
 	if (err)
 		return err;
 
+	/* Set up some inversion flags */
+	timnp = of_get_child_by_name(node, "panel-timing");
+	if (timnp && of_property_read_bool(timnp, "pixelclk-active")) {