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Wed, 11 Oct 2023 05:07:54 -0700 (PDT) Received: from [192.168.1.20] ([178.197.219.100]) by smtp.gmail.com with ESMTPSA id e24-20020a05600c219800b004013797efb6sm18902138wme.9.2023.10.11.05.07.51 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 11 Oct 2023 05:07:53 -0700 (PDT) Message-ID: <513b1049-3cc5-43ad-9ab4-8b90d79d13e8@linaro.org> Date: Wed, 11 Oct 2023 14:07:50 +0200 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 08/20] dt-bindings: serial: samsung: Add google-gs101-uart compatible To: Greg KH , Tudor Ambarus Cc: Peter Griffin , robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, mturquette@baylibre.com, conor+dt@kernel.org, sboyd@kernel.org, tomasz.figa@gmail.com, s.nawrocki@samsung.com, linus.walleij@linaro.org, wim@linux-watchdog.org, linux@roeck-us.net, catalin.marinas@arm.com, will@kernel.org, arnd@arndb.de, olof@lixom.net, cw00.choi@samsung.com, andre.draszik@linaro.org, semen.protsenko@linaro.org, saravanak@google.com, willmcvicker@google.com, soc@kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-clk@vger.kernel.org, linux-gpio@vger.kernel.org, linux-watchdog@vger.kernel.org, kernel-team@android.com, linux-serial@vger.kernel.org References: <20231010224928.2296997-1-peter.griffin@linaro.org> <20231010224928.2296997-9-peter.griffin@linaro.org> <2023101111-banknote-satin-1f77@gregkh> <2023101137-fester-rerun-5c39@gregkh> Content-Language: en-US From: Krzysztof Kozlowski Autocrypt: addr=krzysztof.kozlowski@linaro.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_BLOCKED, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net On 11/10/2023 10:57, Greg KH wrote: > On Wed, Oct 11, 2023 at 09:49:07AM +0100, Tudor Ambarus wrote: >> Hi, Greg, >> >> On 10/11/23 08:48, Greg KH wrote: >>> On Tue, Oct 10, 2023 at 11:49:16PM +0100, Peter Griffin wrote: >>>> Add dedicated google-gs101-uart compatible to the dt-schema for >>>> representing uart of the Google Tensor gs101 SoC. >>>> >>>> Signed-off-by: Peter Griffin >>>> --- >>>> Documentation/devicetree/bindings/serial/samsung_uart.yaml | 2 ++ >>>> 1 file changed, 2 insertions(+) >>>> >>>> diff --git a/Documentation/devicetree/bindings/serial/samsung_uart.yaml b/Documentation/devicetree/bindings/serial/samsung_uart.yaml >>>> index 8bd88d5cbb11..72471ebe5734 100644 >>>> --- a/Documentation/devicetree/bindings/serial/samsung_uart.yaml >>>> +++ b/Documentation/devicetree/bindings/serial/samsung_uart.yaml >>>> @@ -19,11 +19,13 @@ properties: >>>> compatible: >>>> oneOf: >>>> - items: >>>> + - const: google,gs101-uart >>>> - const: samsung,exynosautov9-uart >>>> - const: samsung,exynos850-uart >>>> - enum: >>>> - apple,s5l-uart >>>> - axis,artpec8-uart >>>> + - google,gs101-uart >>> >>> These shouldn't be needed, just declare the device as the same as what >> >> We should have SoC specific compatibles so that any further quirks or >> incompatibilities can be easily addressed. > > "further" work on quirks or incompatibilities can be added when they are > found and needed. We don't add stuff for no good reason to the kernel. With a Devicetree bindings maintainer hat: We expect the device-specific compatible in all bindings, followed by fallback. The fallback is used by the driver, the device-specific for any future needs. This is the practice we follow everywhere and recommend everywhere since some time. It is also documented here: https://elixir.bootlin.com/linux/v6.6-rc5/source/Documentation/devicetree/bindings/writing-bindings.rst#L42 Best regards, Krzysztof