[PATCH v5 5/5] drm/tiny: Add MIPI DBI compatible SPI driver

[Sam Ravnborg]

Hi Noralf,

On Thu, Feb 24, 2022 at 04:27:08PM +0100, Noralf Trønnes wrote:
> Add a driver that will work with most MIPI DBI compatible SPI panels.
> This avoids adding a driver for every new MIPI DBI compatible controller
> that is to be used by Linux. The 'compatible' Device Tree property with
> a '.bin' suffix will be used to load a firmware file that contains the
> controller configuration.
> 
> Example (driver will load sainsmart18.bin):
> 
> display at 0 {
> 	compatible = "sainsmart18", "panel-mipi-dbi-spi";
> ...
> };
> 
> v5:
> - kconfig: s/DRM_KMS_CMA_HELPER/DRM_GEM_CMA_HELPER/ (Sam)
> - kconfig: Add select VIDEOMODE_HELPERS (Sam)
> - kconfig: Add wiki url in the description (Sam)
> - Split out and use of_get_drm_panel_display_mode()(Sam)
> - Only use the first compatible to look for a firmware file since the
>   binding mandates 2 compatibles.
> - Make having a firmware file mandatory so we can print an error
>   message if it's missing to improve the user experience. It's very
>   unlikely that a controller doesn't need to be initialized and if
>   it doesn't, it's possible to have a firmware file containing only
>   a DCS NOP.
> 
> v4:
> - Move driver to drm/tiny where the other drivers of its kind are located.
>   The driver module will not be shared with a future DPI driver after all.
> 
> v3:
> - Move properties to DT (Maxime)
> - The MIPI DPI spec has optional support for DPI where the controller is
>   configured over DBI. Rework the command functions so they can be moved
>   to drm_mipi_dbi and shared with a future panel-mipi-dpi-spi driver
> 
> v2:
> - Drop model property and use compatible instead (Rob)
> - Add wiki entry in MAINTAINERS
> 
> Acked-by: Maxime Ripard <maxime at cerno.tech>
> Signed-off-by: Noralf Trønnes <noralf at tronnes.org>

Looks good.

Reviewed-by: Sam Ravnborg <sam at ravnborg.org>