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 1496436124; Sun, 28 Jul 2024 14:43:49 +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=1722177830; cv=none; b=rl6ZNFNEeEu5HQuw7Tf0uLT+Tot1MuXx9oMGj/X8orYcWfctdapqOIb6D2QYtvzeH8D5YLd7Pobo8L7bugVqo97kI9Q4CMJuLDS7cAkq5CMcktc1qQdFyf9qPkCdv+bWq8SwsIE6ZurJLV7MUDzhN2US1ojJIWU6iGJ+gOxASBg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722177830; c=relaxed/simple; bh=wfnLMU7hOgso8P+5OHz0Fci4F5DBt/XtXnkaeViQHYM=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=dznndV0ySzJ5UdVJu//JRWFr6nIyzv1a2g0pL8W5GkVfqmtr1opqXgOGc9Sa3D1iR1yAfVIBhNfzNcYKPEHxT7IHnWAPLN/6YjAlWYgI7NbQHZN808UAvVg5CUAgVwif69aV4kQolKNu+RVb+zWR6W+ORu2M+Tz+NOuJ3/rePjM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=uoPg3cAG; 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="uoPg3cAG" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6155DC116B1; Sun, 28 Jul 2024 14:43:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1722177829; bh=wfnLMU7hOgso8P+5OHz0Fci4F5DBt/XtXnkaeViQHYM=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=uoPg3cAGkqoGQZfuGu8puRCgzVcEzu82Zvw5YeHomInov6YPZItHn2ldekBwCp6te UuqXeak8v6SjRPIQHICRl+8UACKbzvz3E+qu89SePV8L9rQUqIs5ECE857qExjv8CT w9NlPC043RQ17FRQ3Bknr22hlQ2zDUOX5q+9CX+foFNx23q4saD/pclQcX3okj66E/ Xc/FZkhGFPupY2DNJfJVhNaB/nNB8Cz0xGVrEwSNHiB6wKqi+iUUL/rMgzdBqNlpOD 1UDXlQmHcNbR48fatYFFiiAsc44x2776xMLd6YvNVGCa4/RViMhIwQcHIv9BHo1vAI I8oOnwgG93KiA== Message-ID: <8edc9bd6-2130-44aa-aeaf-cfb5ca43ca0f@kernel.org> Date: Sun, 28 Jul 2024 16:43:42 +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 1/2] dt-bindings: display: Add Sharp Memory LCD bindings To: Alex Lanzano Cc: mehdi.djait@bootlin.com, Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20240725004734.644986-1-lanzano.alex@gmail.com> <20240725004734.644986-2-lanzano.alex@gmail.com> <7zpp4ebzj5xk3wbbpt7l5xnhqg3i52mdjhn3grmn562mres4k5@a3g2xxftk2td> <2d28134f-63d0-498c-8539-1cf2d0f1d68d@kernel.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 28/07/2024 14:56, Alex Lanzano wrote: >>>>> + >>>>> + spi-cs-high: true >>>> >>>> You can drop it. >>>> >>> >>> This is a required property in order for the display to function correctly. >>> But I have no issues removing it if there's a better place to document it. >> >> The sharp LCD device or the board (e.g. via some inversion)? >> > > The sharp LCD device itself. > > https://cdn.sparkfun.com/assets/d/e/8/9/7/LS013B7DH03_datasheet.pdf > Page 16 of the PDF below shows the timing chart for it if interested OK, so you enforce chip select as always high and then someone comes with a board which has a inversion and expect the SoC to drive it low, as usually? In such system this would not work, would it? IOW, I think this is the first case where you require specific CS high and this should make you think why... Best regards, Krzysztof