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MID_RHS_MATCH_FROM(0.00)[]; DNSWL_BLOCKED(0.00)[2a07:de40:b281:104:10:150:64:97:from,2a07:de40:b281:106:10:150:64:167:received]; RCVD_VIA_SMTP_AUTH(0.00)[]; TAGGED_RCPT(0.00)[dt]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:mid,suse.de:dkim,suse.de:email,imap1.dmz-prg2.suse.org:rdns,imap1.dmz-prg2.suse.org:helo,fairphone.com:email] X-Spam-Score: -3.01 X-Spam-Level: Hi Am 28.06.25 um 13:50 schrieb Krzysztof Kozlowski: > On 27/06/2025 13:34, Thomas Zimmermann wrote: >> Hi >> >> Am 27.06.25 um 10:08 schrieb Krzysztof Kozlowski: >>> On Mon, Jun 23, 2025 at 08:44:45AM +0200, Luca Weiss wrote: >>>> Document the interconnects property which is a list of interconnect >>>> paths that is used by the framebuffer and therefore needs to be kept >>>> alive when the framebuffer is being used. >>>> >>>> Acked-by: Thomas Zimmermann >>>> Signed-off-by: Luca Weiss >>>> --- >>>> Documentation/devicetree/bindings/display/simple-framebuffer.yaml | 3 +++ >>>> 1 file changed, 3 insertions(+) >>>> >>>> diff --git a/Documentation/devicetree/bindings/display/simple-framebuffer.yaml b/Documentation/devicetree/bindings/display/simple-framebuffer.yaml >>>> index 296500f9da05e296dbbeec50ba5186b6b30aaffc..f0fa0ef23d91043dfb2b220c654b80e2e80850cd 100644 >>>> --- a/Documentation/devicetree/bindings/display/simple-framebuffer.yaml >>>> +++ b/Documentation/devicetree/bindings/display/simple-framebuffer.yaml >>>> @@ -79,6 +79,9 @@ properties: >>>> power-domains: >>>> description: List of power domains used by the framebuffer. >>>> >>>> + interconnects: >>>> + description: List of interconnect paths used by the framebuffer. >>>> + >>> maxItems: 1, or this is not a simple FB anymore. Anything which needs >>> some sort of resources in unknown way is not simple anymore. You need >>> device specific bindings. >> In this context, 'simple' means that this device cannot change display >> modes or do graphics acceleration. The hardware itself is not >> necessarily simple. As Javier pointed out, it's initialized by firmware > If hardware is not simple, then it needs specific bindings. > >> on the actual hardware. Think of 'VGA-for-ARM'. We need these resources >> to keep the display working. > I don't claim you do not need these resources. I claim device is not > simple thus does not suit rules for generic bindings. Generic bindings > are in general not allowed and we have them only for very, very simple > devices. > > You say this is not simple device, so there you go - specific binding > for this complex (not-simple) device. No, I didn't. I said that the device is simple. I did not say that the device's hardware is simple. Sounds nonsensical, but makes sense here. The simple-framebuffer is just the range of display memory that the firmware configured for printing boot-up messages. We use it for the kernel's output as well.  Being generic and simple is the exact raison d'etre for simple-framebuffer.  (The display property points to the actual hardware, but we don't need it.) Best regards Thomas > > Best regards, > Krzysztof -- -- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Frankenstrasse 146, 90461 Nuernberg, Germany GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman HRB 36809 (AG Nuernberg)