On 23/02/2025 16:29, Luca Weiss wrote: > Hi Krzysztof, > > On 23-02-2025 12:54 p.m., Krzysztof Kozlowski wrote: >> On Sat, Feb 22, 2025 at 06:58:05PM +0100, Luca Weiss wrote: >>> Himax HX83112B is a display driver IC used to drive LCD DSI panels. >>> Describe it and the Fairphone 3 panel from DJN using it. >>> >>> Signed-off-by: Luca Weiss <luca@xxxxxxxxxxxx> >>> --- >>> .../bindings/display/panel/himax,hx83112b.yaml | 75 ++++++++++++++++++++++ >>> 1 file changed, 75 insertions(+) >>> >>> diff --git a/Documentation/devicetree/bindings/display/panel/himax,hx83112b.yaml b/Documentation/devicetree/bindings/display/panel/himax,hx83112b.yaml >>> new file mode 100644 >>> index 0000000000000000000000000000000000000000..e6bd4b33d40be98e479d84617aea6d2af0df70e4 >>> --- /dev/null >>> +++ b/Documentation/devicetree/bindings/display/panel/himax,hx83112b.yaml >>> @@ -0,0 +1,75 @@ >>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause >>> +%YAML 1.2 >>> +--- >>> +$id: http://devicetree.org/schemas/display/panel/himax,hx83112b.yaml# >>> +$schema: http://devicetree.org/meta-schemas/core.yaml# >>> + >>> +title: Himax HX83112B-based DSI display panels >>> + >>> +maintainers: >>> + - Luca Weiss <luca@xxxxxxxxxxxx> >>> + >>> +description: >>> + The Himax HX83112B is a generic DSI Panel IC used to control >>> + LCD panels. >>> + >>> +allOf: >>> + - $ref: panel-common.yaml# >>> + >>> +properties: >>> + compatible: >>> + contains: >>> + const: djn,fairphone-fp3-panel >> >> Why no himax,hx83112b fallback? > > While this is the driver IC for this panel, I don't think there's any > "generic" init sequence that can successfully configure this panel, so > generic hx83112b driver could work I'd say. Hm, indeed usually this would mean no need for unusable fallback alone, but still drivers could use it for some common pieces of code. I imagine there could be a piece of init sequence which is generic. Or some piece of attributes. We already have examples of both approaches for panels - with generic fallback (himax,hx83102) and without (himax,hx83112a). @Rob what is your generic advice? Which of above (himax,hx83102 vs himax,hx83112a) should be used, if the fallback compatible cannot be used alone? Best regards, Krzysztof
