Re: [PATCH 1/3] dt-bindings: display: rockchip: document VOP gamma LUT address

[Doug Anderson]

Hi,

On Tue, Jun 18, 2019 at 2:43 PM Ezequiel Garcia <ezequiel@xxxxxxxxxxxxx> wrote:
>
> Add the register specifier description for an
> optional gamma LUT address.
>
> Signed-off-by: Ezequiel Garcia <ezequiel@xxxxxxxxxxxxx>
> ---
>  .../bindings/display/rockchip/rockchip-vop.txt         | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/display/rockchip/rockchip-vop.txt b/Documentation/devicetree/bindings/display/rockchip/rockchip-vop.txt
> index 4f58c5a2d195..97ad78cc7e03 100644
> --- a/Documentation/devicetree/bindings/display/rockchip/rockchip-vop.txt
> +++ b/Documentation/devicetree/bindings/display/rockchip/rockchip-vop.txt
> @@ -20,6 +20,13 @@ Required properties:
>                 "rockchip,rk3228-vop";
>                 "rockchip,rk3328-vop";
>
> +- reg: Must contain one entry corresponding to the base address and length
> +       of the register space. Can optionally contain a second entry
> +       corresponding to the CRTC gamma LUT address.
> +
> +- reg-names: "base" for the base register space. If present, the CRTC
> +       gamma LUT name should be "lut".

As per Rob Herring, current suggestion is to avoid reg-names when
possible.  The code should just look for the presence of a 2nd entry
and assume that if it's there that it's the lut range.  Full context:

https://lore.kernel.org/lkml/CAL_Jsq+MMunmVWqeW9v2RyzsMKP+=kMzeTHNMG4JDHM7Fy0HBg@xxxxxxxxxxxxxx/

-Doug