From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtpout-03.galae.net (smtpout-03.galae.net [185.246.85.4]) (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 A039C37F002 for ; Thu, 28 May 2026 08:32:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.246.85.4 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779957137; cv=none; b=COFXlQK6POy4rUvsdb2Oi7CMpAIoSjgcT1PPGfKl5qXLsaCSgYF7tnGjVvyhzVXSDxWbUu9jdXZ7lNjgq0MrfzJ83XHTyz+UzJGls9jYv+IJKmjJUZIBLTi2A6N076TV3oYBvSaZx/t75pm46G7LvHvDctLzxkj5YKc4RV6ygdg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779957137; c=relaxed/simple; bh=gidRamgj8eDUV29xH6yqYbCKwqD3sPaJu+YvLyMkSfY=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=RhYjVtmTebIUYyqpbIvRk6UncFPs9kQT1g1roCZUna0k3gffIi08uEwqwjOTmpkdl+amHgtUe6+GH66O6FIOcHgn4CC3o3qnChasXcToMbXfS8ETZwfrANNHTMVB3YMLAb0vMkIxTcDiUMNbQFNvbSJ2291yeM4+p8KQI70BdQg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=1hSr5TXV; arc=none smtp.client-ip=185.246.85.4 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="1hSr5TXV" Received: from smtpout-01.galae.net (smtpout-01.galae.net [212.83.139.233]) by smtpout-03.galae.net (Postfix) with ESMTPS id 482264E42D66; Thu, 28 May 2026 08:32:14 +0000 (UTC) Received: from mail.galae.net (mail.galae.net [212.83.136.155]) by smtpout-01.galae.net (Postfix) with ESMTPS id 1D79960495; Thu, 28 May 2026 08:32:14 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 69D5B1088877F; Thu, 28 May 2026 10:32:10 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1779957133; h=from:subject:date:message-id:to:cc:mime-version:content-type: in-reply-to:references; bh=gidRamgj8eDUV29xH6yqYbCKwqD3sPaJu+YvLyMkSfY=; b=1hSr5TXVmnTbPtQJKgkpYV2a6Ek9sgxLDA/SpJIuDB8+3FqniU/CttkWAwfZNa22p8tXNN SMos1Jy2TqWsZ+IhlVdlAWXGO7ry+BLa4tRRISyytzxH0cRnxQ82DbvDfxvbwhcbW316SZ spCHpG3/xXk/cdeVVKP8yvQCJRlDW2EThFLlmuV6R5SdQdkZG2YzaIWJmZMe5iZErbvbIv pyoi0IFqjH40+GkKa7b4XP2qxKmjy0eS4BlQKLrZbgG05BbKXQCkslXYIjuT61HcoEOREb 19rZRbaWUB6t147UqyddLmGN+wgjPD04DippIctN7RVYUPvknSIsBmw0JB68zQ== From: Miquel Raynal To: Santhosh Kumar K Cc: , , , , , , , , , , , , , , , Subject: Re: [PATCH v3 01/13] spi: dt-bindings: allow spi-max-frequency to specify a frequency pair In-Reply-To: <20260527175527.2247679-2-s-k6@ti.com> (Santhosh Kumar K.'s message of "Wed, 27 May 2026 23:25:15 +0530") References: <20260527175527.2247679-1-s-k6@ti.com> <20260527175527.2247679-2-s-k6@ti.com> User-Agent: mu4e 1.12.7; emacs 30.2 Date: Thu, 28 May 2026 10:32:10 +0200 Message-ID: <87wlwogcj9.fsf@bootlin.com> Precedence: bulk X-Mailing-List: linux-spi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain X-Last-TLS-Session-Version: TLSv1.3 On 27/05/2026 at 23:25:15 +0530, Santhosh Kumar K wrote: > Some SPI controllers support high-speed operating modes that require > controller-side configuration before the device can be driven at its > rated maximum frequency. In these cases two frequencies are relevant: > a conservative speed usable without any such configuration, and the > maximum speed achievable once the controller is set up accordingly. > > The existing spi-max-frequency property accepts only a single u32, > which cannot express this distinction. Extend it to accept either a > single value (retaining full backward compatibility) or a two-element > array [base-frequency, max-frequency], where base-frequency is the > conservative operating speed and max-frequency is the highest speed > the device supports after controller-side configuration. > > Signed-off-by: Santhosh Kumar K Reviewed-by: Miquel Raynal