From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 4942A547059; Thu, 1 Oct 2026 06:55:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790837754; cv=none; b=UpvetYoS/dk6g2h/CoY5AJ8mbWfZZnpyL72uuyrLY4j9FQWYGR11it9o8docfO10pSz6thpMALQ0oYgNiA8S7k5ylhZ66ex9+tthAA2npqHGuRqqNV5NJhAQllqZiPM2JVPfN46pdf2qoLtx0gtqqfZb9PwswYRzfXtnCTMCxdM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790837754; c=relaxed/simple; bh=QoLNnGt1QfuA1ANyUEKP/0a+XKjsESBZmtSKcHLf3Ac=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=MJaRzDwqCWIM+m2414x5IyBQb3n4I1hPMowdei8Pr/tb6YHs+rbhTJez233yJhs9f81Cf2OAmDrp2K2egi7cuGuWnk+0KoamuaVxptu2PLZnWa8HPwQC/onuwsP9Dovv99KRT3yPGxjenzt53X2KrPZ6qAg7kTH2tot0nvVh+Vc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hhANQ7SV; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="hhANQ7SV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 98CD01F000FF; Thu, 1 Oct 2026 06:55:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790837752; bh=p4Ts2/n0F4w6WOA2qsy7F0lIPhEi3nzuiwcrYnsLlSQ=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=hhANQ7SVoq0le0p9KfJ3llwvejnoX2UI4LZBbxtgz7Ur+VNrdHTzE6AGlMBQH8E6O +Exw8YX9KaS0OurzuUIU7huBrw7o+NhnsVzqk5CKPjqJXk2K2l3KV8GG50nD/SCnpj Iq/KhikYuRPceOvfqv32nVK1NEcymcJBEMNN/v/FwIoQnL+tUBPi+v8N4IPYlpeWah i89FmLeo/JxUzWQZXc8liLJDHUGEHu1M9k5fC07PJTaTvAWFCrcbKKVB6SxHSK9J5o BmqF1nbAR1jE64OEhn4rFr427PYJecyX4uKj2JUNbrGP5+0F6lFlJ260kEGNjM+zUU R0ObaT7Ina3uw== Date: Thu, 1 Oct 2026 08:55:48 +0200 From: Krzysztof Kozlowski To: Arpit Saini Cc: Neil Armstrong , Jessica Zhang , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Krzysztof Kozlowski , devicetree@vger.kernel.org, rajeevny@qti.qualcomm.com Subject: Re: [PATCH 1/2] dt-bindings: display: panel: add optional wled-supply Message-ID: <20261001-private-wooden-chachalaca-51aa57@quoll> References: <20260929-wled-supply-series-v1-0-75d0a83b4b00@oss.qualcomm.com> <20260929-wled-supply-series-v1-1-75d0a83b4b00@oss.qualcomm.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20260929-wled-supply-series-v1-1-75d0a83b4b00@oss.qualcomm.com> On Tue, Sep 29, 2026 at 06:42:20PM +0530, Arpit Saini wrote: > Some boards drive the ILI7807S panel's backlight from an external > WLED driver whose enable input is wired to a GPIO, typically modeled > as a fixed regulator (e.g. vreg_wled). You describe something else. What's fixed regulator should not matter here. Which pin is it in ILI7807S? It seems you just want to represent GPIO with a regulator. This is just confusing and typical downstream workaround. > > Document the optional wled-supply property for the ILI7807S panel > binding. When present, the supply can be used to control the enable > input of the external WLED driver. > > Platforms without an external WLED enable supply can omit this > property and continue to use the existing backlight handling. > > Fixes: 447a76a99e24 ("dt-bindings: display: panel: add Ilitek ILI7807S panel controller") > Signed-off-by: Arpit Saini > --- > .../devicetree/bindings/display/panel/ilitek,ili7807s.yaml | 12 ++++++++++++ > 1 file changed, 12 insertions(+) > > diff --git a/Documentation/devicetree/bindings/display/panel/ilitek,ili7807s.yaml b/Documentation/devicetree/bindings/display/panel/ilitek,ili7807s.yaml > index ba8c5bbf8ffc..8d56b74a962a 100644 > --- a/Documentation/devicetree/bindings/display/panel/ilitek,ili7807s.yaml > +++ b/Documentation/devicetree/bindings/display/panel/ilitek,ili7807s.yaml > @@ -34,6 +34,10 @@ properties: > description: Negative LCD bias supply (AVEE), typically -5.5V > (range -6.3V to -4.5V) > > + wled-supply: > + description: Optional Supply for the WLED driver that provides the > + panel backlight > + > required: > - compatible > - reg > @@ -49,6 +53,13 @@ examples: > - | > #include > > + vreg_wled: regulator-wled { > + compatible = "regulator-fixed"; > + regulator-name = "vreg_wled"; > + gpio = <&tlmm 91 GPIO_ACTIVE_HIGH>; > + enable-active-high; > + }; Irrelevant here Best regards, Krzysztof