[v4,0/2] Add DSI panel driver for Raydium RM67191

This patch-set contains the DRM panel driver and dt-bindings documentation
for the DSI driven panel: Raydium RM67191.

v4:
- Changed default_timing structure type from 'struct display_timing' to
  'struct drm_display_mode' (fabio)
- Replaced devm_gpiod_get with devm_gpiod_get_optional (fabio)
- Added power regulators (fabio)
- Removed pm_ops (fabio)

v3:
- Added myself to MAINTAINERS for this driver (sam)
- Removed display-timings property (fabio)
- Fixed dt description (sam)
- Re-arranged calls inside get_modes function (sam)
- Changed ifdefs with _maybe_unused for suspend/resume functions (sam)
- Collected Reviewed-by from Sam

v2:
- Fixed 'reset-gpio' to 'reset-gpios' property naming (fabio)
- Changed the state of the reset gpio to active low and fixed how it is
  handled in driver (fabio)
- Fixed copyright statement (daniel)
- Reordered includes (sam)
- Added defines for panel specific color formats (fabio)
- Removed unnecessary tests in enable and unprepare (sam)
- Removed the unnecessary backlight write in enable (sam)

Robert Chiras (2):
  dt-bindings: display: panel: Add support for Raydium RM67191 panel
  drm/panel: Add support for Raydium RM67191 panel driver

 .../bindings/display/panel/raydium,rm67191.txt     |  41 ++
 MAINTAINERS                                        |   6 +
 drivers/gpu/drm/panel/Kconfig                      |   9 +
 drivers/gpu/drm/panel/Makefile                     |   1 +
 drivers/gpu/drm/panel/panel-raydium-rm67191.c      | 673 +++++++++++++++++++++
 5 files changed, 730 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/panel/raydium,rm67191.txt
 create mode 100644 drivers/gpu/drm/panel/panel-raydium-rm67191.c

Hi Robert,

On Tue, Jun 25, 2019 at 4:28 AM Robert Chiras <robert.chiras@nxp.com> wrote:

> +static int rad_bl_get_brightness(struct backlight_device *bl)
> +{
> +       struct mipi_dsi_device *dsi = bl_get_data(bl);
> +       struct rad_panel *rad = mipi_dsi_get_drvdata(dsi);
> +       struct device *dev = &dsi->dev;
> +       u16 brightness;
> +       int ret;
> +
> +       if (!rad->prepared)
> +               return 0;
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "\n");

Please remove this debug line.

> +       if (!rad->prepared)
> +               return 0;
> +
> +       DRM_DEV_DEBUG_DRIVER(dev, "New brightness: %d\n", bl->props.brightness);

Please remove it.

> +       ret = of_property_read_u32(np, "dsi-lanes", &dsi->lanes);
> +       if (ret) {
> +               dev_err(dev, "Failed to get dsi-lanes property (%d)\n", ret);
> +               return ret;
> +       }
> +
> +       panel->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);

Even it is optional, you still need to check for error and propagate
it in the case of error.

Otherwise defer probe will not work.

> +       ret = drm_panel_add(&panel->panel);
> +       if (ret)
> +               return ret;
> +
> +

One blank line is enough.