From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f47.google.com (mail-ot1-f47.google.com [209.85.210.47]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AE9672C80 for ; Wed, 1 Dec 2021 21:57:55 +0000 (UTC) Received: by mail-ot1-f47.google.com with SMTP id v15-20020a9d604f000000b0056cdb373b82so37250863otj.7 for ; Wed, 01 Dec 2021 13:57:55 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to; bh=//K6WrNNdMpHYOkOWh74IhNe5APWD9tbaI8fuCB3qaM=; b=d8HkKS0x6tL4rZgvTjK/X87KfzX1asp/nI20i91ukh0WJ2oO14hytBc5Eq/LKpypX2 d30xy5Nz5gVQA97FnrKvmyAWnkn00I0+Dlncl5UGyK8aTImoHD2XJOt7ADRZeYqr5PWq kpfmHP8ZY0r7wIk/O1P0zfrFUtWjUBOdVQJn52eYazTBWf12MxSKZSHC0WD8VFFfJt2w xSatrr7FF2gHDJ+jRnh/WvhbQu7fwpn59qAdjba795Ry4vo0aRmTzs3w6OIPZDvRwiah 5OUWQ6Tcu9eoPzde8C43pXmt1gZe/wUQVS0/OstSYEs02Zmdo0ggDrTU/YbN3gLt04gW xd1Q== X-Gm-Message-State: AOAM531RXeAosUQUH6U1Ms8ecoYCw8KfKBEG0djb0j/3pxLJ/fvXlhu4 93p8mBx5ea3ndBQk1nuxpzUXLTF6Bg== X-Google-Smtp-Source: ABdhPJxU0ByCUmBkqgOAJ1D4kaYrkltxru1tMYSyrRfbzYfu6ugRNzCqfZ2w09Xc+nuehdoGMGvvQQ== X-Received: by 2002:a05:6830:4391:: with SMTP id s17mr8280415otv.118.1638395874824; Wed, 01 Dec 2021 13:57:54 -0800 (PST) Received: from robh.at.kernel.org (66-90-148-213.dyn.grandenetworks.net. [66.90.148.213]) by smtp.gmail.com with ESMTPSA id u136sm479201oie.13.2021.12.01.13.57.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Dec 2021 13:57:54 -0800 (PST) Received: (nullmailer pid 2750212 invoked by uid 1000); Wed, 01 Dec 2021 21:57:53 -0000 Date: Wed, 1 Dec 2021 15:57:53 -0600 From: Rob Herring To: Noralf =?iso-8859-1?Q?Tr=F8nnes?= Cc: maxime@cerno.tech, linux-fbdev@vger.kernel.org, robh+dt@kernel.org, dave.stevenson@raspberrypi.com, linux-staging@lists.linux.dev, david@lechnology.com, devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: Re: [PATCH 3/6] dt-bindings: display: sitronix,st7735r: Remove spi-max-frequency limit Message-ID: References: <20211124150757.17929-1-noralf@tronnes.org> <20211124150757.17929-4-noralf@tronnes.org> Precedence: bulk X-Mailing-List: linux-staging@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20211124150757.17929-4-noralf@tronnes.org> On Wed, 24 Nov 2021 16:07:54 +0100, Noralf Trønnes wrote: > The datasheet lists the minimum Serial clock cycle (Write) as 66ns which is > 15MHz. Mostly it can do much better than that and is in fact often run at > 32MHz. With a clever driver that runs configuration commands at a low speed > and only the pixel data at the maximum speed the configuration can't be > messed up by transfer errors and the speed is only limited by the amount of > pixel glitches that one is able to tolerate. > > Signed-off-by: Noralf Trønnes > --- > .../devicetree/bindings/display/sitronix,st7735r.yaml | 4 +--- > 1 file changed, 1 insertion(+), 3 deletions(-) > Acked-by: Rob Herring