From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 35C9222370D; Sat, 28 Jun 2025 11:50:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751111449; cv=none; b=szPT58LkrK59TKOebflqjkig9PDvpdT3zCU1beAZeOXXne0AjcNWMkWFAbrUGaICVHIhz7wc7wvfOBa4Xlqffh9lILcpmyNyaqmduJKAiTz2DnyEXQwzfx4hE4C450v6RSiR3I3I9rqJI8vH67J3Fi3pNFoFvLnAP5EwE2N0U1I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751111449; c=relaxed/simple; bh=pSV6l3T7JmbSCdl9fP3e9xqmfil0Of6rRvqXh+ApX/s=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=lOooZNIoj9mG/r7Fv/avQO/52AOiWCg6QKa2gXpMgrQSc/NFxmITrju4IKQpLOFJ62GJ/ppRdWSZ/J4zLLY+U2NDTTNeLGqJfsPGWVmvDQN0p8aAJVAygJ/269TiZS+djNpKQPuacqP56BSgI0yTwY6MqS1i0W5+M/Nb+7fvslA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=bwFrBJ0u; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="bwFrBJ0u" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 40600C4CEEA; Sat, 28 Jun 2025 11:50:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1751111448; bh=pSV6l3T7JmbSCdl9fP3e9xqmfil0Of6rRvqXh+ApX/s=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=bwFrBJ0uiRaZwBWweZ1XvO+QkqB2Q3cQ9ZIwpIuYH04iOvL5y+Mh9OMJYqEGqt/e4 0XZ6VZxtasWfRRFt+q72dzoD9ihhGqkneLsdSQJm/7Ijc21wLEojyfNzbaOVOvu6QV 3XezHpc0a8tK7zYvtohyfbWUisKqSPlco2TZdo5ttUUFUPnF+wOkWcfNA3/+0JcQgF jTmjwYyD0lJcAxftp3mgKYl+8rgdgAlpKnkG8czV1OY3PNy3Z3CqqVFJzB97JaMZRz EbJFQetmLkU9zsGhSEpxYtQTlPvAUe05AX8cE7mP1V0dcRv+mD2wK9uPo30V8enNZH BUKz8wWbtv04Q== Message-ID: Date: Sat, 28 Jun 2025 13:50:40 +0200 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/5] dt-bindings: display: simple-framebuffer: Add interconnects property To: Thomas Zimmermann , Luca Weiss Cc: Hans de Goede , Maarten Lankhorst , Maxime Ripard , David Airlie , Simona Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Javier Martinez Canillas , Helge Deller , linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20250623-simple-drm-fb-icc-v2-0-f69b86cd3d7d@fairphone.com> <20250623-simple-drm-fb-icc-v2-1-f69b86cd3d7d@fairphone.com> <20250627-mysterious-optimistic-bird-acaafb@krzk-bin> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit 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. Best regards, Krzysztof