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<76ce7d78-5870-41c5-9114-9d230caeb2d0@oss.nxp.com> Date: Fri, 26 Sep 2025 12:46:46 +0300 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 12/13] dt-bindings: lpspi: Document nxp,lpspi-pincfg property To: James Clark , Frank Li , Larisa Grigore Cc: Mark Brown , Clark Wang , Fugang Duan , Gao Pan , Fugang Duan , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Shawn Guo , Sascha Hauer , Fabio Estevam , Ghennadi Procopciuc , Ciprianmarian Costea , s32@nxp.com, linux-spi@vger.kernel.org, imx@lists.linux.dev, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org References: <20250814-james-nxp-lpspi-v1-0-9586d7815d14@linaro.org> <20250814-james-nxp-lpspi-v1-12-9586d7815d14@linaro.org> <05701887-f78c-4de5-b7fa-d34afdb53af9@linaro.org> Content-Language: en-US From: Larisa Ileana Grigore In-Reply-To: <05701887-f78c-4de5-b7fa-d34afdb53af9@linaro.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: 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X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR04MB7958 On 8/19/2025 12:52 PM, James Clark wrote: > > > On 18/08/2025 4:39 pm, Frank Li wrote: >> On Mon, Aug 18, 2025 at 03:47:45PM +0100, James Clark wrote: >>> >>> >>> On 14/08/2025 7:19 pm, Frank Li wrote: >>>> On Thu, Aug 14, 2025 at 05:06:52PM +0100, James Clark wrote: >>>>> Document the two valid pincfg values and the defaults. >>>>> >>>>> Although the hardware supports two more values for half-duplex modes, >>>>> the driver doesn't support them so don't document them. >>>> >>>> binding doc should be first patch before drivers. >>>> >>>> binding descript hardware not driver, you should add all regardless if >>>> driver support it. >>>> >>> >>> Replied to same on "[PATCH 10/13] spi: spi-fsl-lpspi: Add compatible for >>> S32G" >>> >>>>> >>>>> Signed-off-by: James Clark >>>>> --- >>>>>    Documentation/devicetree/bindings/spi/spi-fsl-lpspi.yaml | 14 ++ >>>>> ++++++++++++ >>>>>    1 file changed, 14 insertions(+) >>>>> >>>>> diff --git a/Documentation/devicetree/bindings/spi/spi-fsl- >>>>> lpspi.yaml b/Documentation/devicetree/bindings/spi/spi-fsl-lpspi.yaml >>>>> index ce7bd44ee17e..3f8833911807 100644 >>>>> --- a/Documentation/devicetree/bindings/spi/spi-fsl-lpspi.yaml >>>>> +++ b/Documentation/devicetree/bindings/spi/spi-fsl-lpspi.yaml >>>>> @@ -70,6 +70,19 @@ properties: >>>>>      power-domains: >>>>>        maxItems: 1 >>>>> >>>>> +  nxp,pincfg: >>>>> +    description: >>>>> +      'Pin configuration value for CFGR1.PINCFG. >>>>> +        - "sin-in-sout-out": SIN is used for input data and SOUT >>>>> is used for >>>>> +                             output data >>>>> +        - "sout-in-sin-out": SOUT is used for input data and SIN >>>>> is used for >>>>> +                             output data >>>>> +      If no value is specified then the default is "sin-in-sout- >>>>> out" for host >>>>> +      mode and "sout-in-sin-out" for target mode.' >>>> >>>> why need this? are there varible at difference boards? look like >>>> default >>>> is more make sense. >>>> >>> >>> + Larissa. I think this might also be a question for the hardware >>> designers >>> about why the feature to swap the pins was deemed worth including. >>> >>> I'm assuming the flexibility is given for routing reasons. If you have >>> another device with the pins in one order then you can route it >>> without a >>> via if they happen to be in the same order. >> >> DT team need reason to judge if a new property is reasonable/ >> neccesary. You >> need  mention the reason why need this property. Here, some board design >> swap sin/sout. >> > > Let's wait for Larisa to reply. If there's no board and it was only for > testing maybe we can drop it. > Hello James, There was no board. You can drop it. Regards, Larisa