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[73.162.191.63]) by smtp.gmail.com with ESMTPSA id p94sm1516093pjp.15.2020.03.02.23.38.07 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 02 Mar 2020 23:38:07 -0800 (PST) Date: Mon, 2 Mar 2020 23:37:46 -0800 From: Nicolin Chen To: Shengjiu Wang Cc: Rob Herring , Shengjiu Wang , Mark Rutland , "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" , Linux-ALSA , linuxppc-dev@lists.ozlabs.org, linux-kernel , Timur Tabi , Xiubo Li , shawnguo@kernel.org, s.hauer@pengutronix.de, Takashi Iwai , Liam Girdwood , Mark Brown , linux-imx@nxp.com, kernel@pengutronix.de, Fabio Estevam , linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v4 1/8] ASoC: dt-bindings: fsl_asrc: Change asrc-width to asrc-format Message-ID: <20200303073745.GA2868@Asurada> References: <872c2e1082de6348318e14ccd31884d62355c282.1583039752.git.shengjiu.wang@nxp.com> <20200303014133.GA24596@bogus> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.22 (2013-10-16) Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On Tue, Mar 03, 2020 at 11:59:30AM +0800, Shengjiu Wang wrote: > Hi > > On Tue, Mar 3, 2020 at 9:43 AM Rob Herring wrote: > > > > On Sun, Mar 01, 2020 at 01:24:12PM +0800, Shengjiu Wang wrote: > > > asrc_format is more inteligent, which is align with the alsa > > > definition snd_pcm_format_t, we don't need to convert it to > > > format in driver, and it can distinguish S24_LE & S24_3LE. > > > > > > Signed-off-by: Shengjiu Wang > > > --- > > > Documentation/devicetree/bindings/sound/fsl,asrc.txt | 4 +++- > > > 1 file changed, 3 insertions(+), 1 deletion(-) > > > > > > diff --git a/Documentation/devicetree/bindings/sound/fsl,asrc.txt b/Documentation/devicetree/bindings/sound/fsl,asrc.txt > > > index cb9a25165503..0cbb86c026d5 100644 > > > --- a/Documentation/devicetree/bindings/sound/fsl,asrc.txt > > > +++ b/Documentation/devicetree/bindings/sound/fsl,asrc.txt > > > @@ -38,7 +38,9 @@ Required properties: > > > > > > - fsl,asrc-rate : Defines a mutual sample rate used by DPCM Back Ends. > > > > > > - - fsl,asrc-width : Defines a mutual sample width used by DPCM Back Ends. > > > + - fsl,asrc-format : Defines a mutual sample format used by DPCM Back > > > + Ends. The value is one of SNDRV_PCM_FORMAT_XX in > > > + "include/uapi/sound/asound.h" > > > > You can't just change properties. They are an ABI. > > I have updated all the things related with this ABI in this patch series. > What else should I do? You probably should add one beside the old one. And all the existing drivers would have to continue to support "fsl,asrc-width", even if they start to support the new "fsl,asrc-format". The ground rule here is that a newer kernel should be able to work with an old DTB, IIRC. One more concern here is about the format value. Though I don't think those values, defined in asound.h, would be changed, yet I am not sure if it's legit to align DT bindings to a subsystem header file -- I only know that usually we keep shared macros under include/dt-bindings folder. I won't have any problem, if either Rob or Mark has no objection.