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Fri, 03 Nov 2023 06:29:23 -0700 (PDT) Date: Fri, 3 Nov 2023 09:29:12 -0400 From: Ben Wolsieffer To: Conor Dooley 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: References: <20231102193722.3042245-1-ben.wolsieffer@hefring.com> <20231102193722.3042245-4-ben.wolsieffer@hefring.com> <20231103-recognize-unwashed-b8f1a83fe851@spud> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20231103-recognize-unwashed-b8f1a83fe851@spud> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231103_062928_165900_BA629998 X-CRM114-Status: GOOD ( 15.47 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Conor, 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? 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 <=8 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 <=8 bit word sizes. > > Cheers, > Conor. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel