[RFC PATCH 06/12] drm: panel: Parse "te-polarity" in Sharp lq101r1sx01 driver

[Mark Zhang]

Signed-off-by: Mark Zhang <markz at nvidia.com>
---
 drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c 
b/drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c
index b69f88cd15b2..654575607864 100644
--- a/drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c
+++ b/drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c
@@ -27,6 +27,7 @@ struct sharp_panel {

        struct backlight_device *backlight;
        struct regulator *supply;
+       u32 te_polarity;

        bool prepared;
        bool enabled;
@@ -280,7 +281,7 @@ static int sharp_panel_enable(struct drm_panel *panel)
        return 0;
 }

-static const struct drm_display_mode default_mode = {
+static struct drm_display_mode default_mode = {
        .clock = 278000,
        .hdisplay = 2560,
        .hsync_start = 2560 + 128,
@@ -297,6 +298,12 @@ static const struct drm_display_mode default_mode = {
 static int sharp_panel_get_modes(struct drm_panel *panel)
 {
        struct drm_display_mode *mode;
+       struct sharp_panel *sharp = to_sharp_panel(panel);
+
+       if (sharp->te_polarity)
+               default_mode.flags |= DRM_MODE_FLAG_TE_POLARITY_HIGH;
+       else
+               default_mode.flags |= DRM_MODE_FLAG_TE_POLARITY_LOW;

        mode = drm_mode_duplicate(panel->drm, &default_mode);
        if (!mode) {
@@ -341,6 +348,14 @@ static int sharp_panel_add(struct sharp_panel *sharp)
        if (IS_ERR(sharp->supply))
                return PTR_ERR(sharp->supply);

+       err = of_property_read_u32(sharp->link1->dev.of_node,
+                                       "te-polarity", &sharp->te_polarity);
+       if (err < 0) {
+               dev_err(&sharp->link1->dev,
+                       "Read te-polarity failed: %d\n", err);
+               return err;
+       }
+
        np = of_parse_phandle(sharp->link1->dev.of_node, "backlight", 0);
        if (np) {
                sharp->backlight = of_find_backlight_by_node(np);
-- 
2.1.4