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 03E4C1A585 for ; Fri, 3 Nov 2023 14:52:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="H/hhCnHg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8B2EBC433C8; Fri, 3 Nov 2023 14:52:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1699023124; bh=4bHaoYOS4B9eXzOUxbBMi4UFw6BQf47ZMRIEzv/wmGk=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=H/hhCnHgvk0wtt4RmBnnVGvhZ2iYuOefHbOYtZ+3xY+pocEj9jM8jbswuiz4f8sM9 0HpfMQTmAc18HxjUgLduXc3eSh7JTVyDL1OvR7m/gSsWcI2VdJUd7EdVNY4w/SdgLj GAyk3x6O9spbV+q0EdkVG7HU8Md5a4TgMxTYZ7MarmdUQmXPBxm8+jImSh6AonzGMn 4MsH7LHsUTi5khe9KkkYyD8bu2yOw2XyR+3sF++K6rtGxMJRAjFzqsVGsVNKziZXmj OSlSVhk5fIYKWMwLhKU6rnq5mlo/WWtRlBHpylWmme/Fx8/at520Z2eKx8T9a7Irla EnxIPPzaFifxg== Date: Fri, 3 Nov 2023 14:51:59 +0000 From: Conor Dooley To: Ben Wolsieffer Cc: linux-spi@vger.kernel.org, devicetree@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Maxime Coquelin , Alexandre Torgue , Alain Volmat , Erwan Leray , Fabrice Gasnier Subject: Re: [PATCH v2 3/5] dt-bindings: spi: add stm32f7-spi compatible Message-ID: <20231103-appendix-emission-952777ef7c4f@spud> References: <20231102193722.3042245-1-ben.wolsieffer@hefring.com> <20231102193722.3042245-4-ben.wolsieffer@hefring.com> <20231103-recognize-unwashed-b8f1a83fe851@spud> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="tTMlnMyASVIYvi+Q" Content-Disposition: inline In-Reply-To: --tTMlnMyASVIYvi+Q Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Nov 03, 2023 at 09:29:12AM -0400, Ben Wolsieffer wrote: > Hi Conor, >=20 > On Fri, Nov 03, 2023 at 12:50:53PM +0000, Conor Dooley wrote: > > On Thu, Nov 02, 2023 at 03:37:20PM -0400, Ben Wolsieffer wrote: > > A wider range of supported word sizes and some additional buffers, > > implies that the F4 could be used as a fallback compatible. Does the > > register map change incompatibly in the process of widening the FIFOs or > > something like that? >=20 > Yes, the F4 has a single bit to select 8 or 16 bit word size, while the > F7 uses four bits to select an arbitrary word size from 4 to 16 bits. > This series supports the packing mode, to allow sending two <=3D8 bit > words with a single write to the FIFO, but even if we didn't want to > support this feature, the F7 would require setting the FRXTH bit (not > present in the F4) when using <=3D8 bit word sizes. Oke. Acked-by: Conor Dooley Cheers, Conor. --tTMlnMyASVIYvi+Q Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iHUEABYIAB0WIQRh246EGq/8RLhDjO14tDGHoIJi0gUCZUUJCwAKCRB4tDGHoIJi 0uZNAQDaM89wVrUomad2qB/scux1aTsV0078OLOhPo1oBRJU6QEAreeGymSr+62N 2wgkvW+8zNqVcQ2CZILtHMikzYCVbwI= =lzfn -----END PGP SIGNATURE----- --tTMlnMyASVIYvi+Q--