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 D1309433AC; Tue, 9 Sep 2025 06:56:49 +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=1757401010; cv=none; b=OXF/lMcnynISePwOCGCHWnO1dFyGGiIHB4e5r/byfwslW1OHogF7dFqpb6kaX271dmx2ZsBfLjCTC8pw5h7+zsHie1TwYWbBRSxZOnPVs++ZxOpGhtJwmegoHcH44YyRaT/NgHkx+YgwcWSAt3nvxy7ZTD37ZzmabenlRs1FDRU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757401010; c=relaxed/simple; bh=hnJH5C3OpaIIK3hyzpIrwMipqvYJj91l3eSueWTRe3s=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=SCe5Q4JHInX9oOuRQhyBjS6isFbreNSAwUDG5dTgAnsf+nRIK93RyLHa2vJLMQNgWchT+UbkXbIHpAuFLxS/hQXSzVaEIx6uWx7MFd+aPqB/vqFSsaTkw8PbYv4Kc3ryO3V5b5ROnuTZ9BUUdgPSkPHooR/DNbnMOOKAwJxFA9c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=j/sGI9JU; 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="j/sGI9JU" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C98C9C4CEF4; Tue, 9 Sep 2025 06:56:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1757401009; bh=hnJH5C3OpaIIK3hyzpIrwMipqvYJj91l3eSueWTRe3s=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=j/sGI9JUba8PwIvD4rCNzEu+QAKX8Iv4Xl4p68eunJTs6le9RRqKzV0NLQWEyb3JB 6HS+b30VURdI5feCaMKv9FGS7Uxx7k+njIcFs3UzNzBEDBBK5ukn1DcMTGKkOUGSE0 sPpsDQmpRYgm2XdtcxOdSbB3A4AJWKfGMEIUCV6sGdGp5ZUTiabe8XxZOvjbhqqIgh soz8b4qJiIfEMSyR0Jw00FF+k3rMdHHMiXB/gU72EqMEgRwD0GNXYfToeB6ztgPtiM QnwjTtlIFgVA2W9FjZ+VekMVaO9J2Dcd+9KSPcyzcuXL5SMkmvYvriTE0Pg0IDU2lB dCCZMu3Jq8pUw== Message-ID: Date: Tue, 9 Sep 2025 08:56:36 +0200 Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1 13/14] dt-bindings: input/touchscreen: Convert MELFAS MIP4 Touchscreen to YAML To: Linus Walleij , Dmitry Torokhov Cc: Ariel D'Alessandro , airlied@gmail.com, amergnat@baylibre.com, andrew+netdev@lunn.ch, andrew-ct.chen@mediatek.com, angelogioacchino.delregno@collabora.com, broonie@kernel.org, chunkuang.hu@kernel.org, ck.hu@mediatek.com, conor+dt@kernel.org, davem@davemloft.net, edumazet@google.com, flora.fu@mediatek.com, houlong.wei@mediatek.com, jeesw@melfas.com, jmassot@collabora.com, kernel@collabora.com, krzk+dt@kernel.org, kuba@kernel.org, kyrie.wu@mediatek.corp-partner.google.com, lgirdwood@gmail.com, louisalexis.eyraud@collabora.com, maarten.lankhorst@linux.intel.com, matthias.bgg@gmail.com, mchehab@kernel.org, minghsiu.tsai@mediatek.com, mripard@kernel.org, p.zabel@pengutronix.de, pabeni@redhat.com, robh@kernel.org, sean.wang@kernel.org, simona@ffwll.ch, support.opensource@diasemi.com, tiffany.lin@mediatek.com, tzimmermann@suse.de, yunfei.dong@mediatek.com, devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org, linux-gpio@vger.kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-sound@vger.kernel.org, netdev@vger.kernel.org References: <20250820171302.324142-1-ariel.dalessandro@collabora.com> <20250820171302.324142-14-ariel.dalessandro@collabora.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit On 05/09/2025 13:33, Linus Walleij wrote: > On Fri, Sep 5, 2025 at 12:02 PM Dmitry Torokhov > wrote: >> On Thu, Aug 21, 2025 at 01:56:24PM +0200, Linus Walleij wrote: >>> Hi Ariel, >>> >>> thanks for your patch! >>> >>> On Wed, Aug 20, 2025 at 7:17 PM Ariel D'Alessandro >>> wrote: >>> >>>> + ce-gpios: >>>> + description: GPIO connected to the CE (chip enable) pin of the chip >>>> + maxItems: 1 >>> >>> Mention that this should always have the flag GPIO_ACTIVE_HIGH >>> as this is required by the hardware. >>> >>> Unfortunately we have no YAML syntax for enforcing flags :/ >> >> Theoretically there can be an inverter on the line, so from the AP point >> of view the line is active low while from the peripheral POV the pin is >> active high... > > Yes, I think someone even proposed adding inverters to the > device tree and was nixed. It's not about DT, it's about board design - you can (almost?) always invert the logical signal, so this should match what hardware requires plus any inverter on the board. > > It's a matter of phrasing I would say: > > "Mention that this should nominally have the flag GPIO_ACTIVE_HIGH No, please do not, it is wrong. If hardware requires active high, then just say this is active high. But the actual GPIO flag depends on the board design if signal is inverted. Best regards, Krzysztof