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Sun, 28 Aug 2022 20:18:06 -0700 Received: from mtkcas10.mediatek.inc (172.21.101.39) by mtkmbs11n2.mediatek.inc (172.21.101.187) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.2.792.15; Mon, 29 Aug 2022 10:37:29 +0800 Received: from mhfsdcap04 (10.17.3.154) by mtkcas10.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Mon, 29 Aug 2022 10:37:28 +0800 Message-ID: <114c357f8d7f049d21ede789a292a8e2d45f4c61.camel@mediatek.com> Subject: Re: [PATCH 2/7] dt-bindings: phy: mediatek,tphy: add property to set pre-emphasis From: Chunfeng Yun To: Krzysztof Kozlowski , Vinod Koul , Rob Herring CC: Kishon Vijay Abraham I , Krzysztof Kozlowski , Matthias Brugger , , , , , , Eddie Hung Date: Mon, 29 Aug 2022 10:37:28 +0800 In-Reply-To: <000babd8-5980-3d77-f156-324b3442cbe7@linaro.org> References: <20220819091344.2274-1-chunfeng.yun@mediatek.com> <20220819091344.2274-2-chunfeng.yun@mediatek.com> <438da392-f419-ad76-7e91-aa4aab36e12c@linaro.org> <816ecf6287533137b750c8bde9de5830e4229c56.camel@mediatek.com> <1a16cce9fe164bafc06ae193310be71c6f645d75.camel@mediatek.com> <000babd8-5980-3d77-f156-324b3442cbe7@linaro.org> X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.2 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220828_201812_986602_E830E7EB X-CRM114-Status: GOOD ( 22.54 ) 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 On Fri, 2022-08-26 at 09:36 +0300, Krzysztof Kozlowski wrote: > On 26/08/2022 08:36, Chunfeng Yun wrote: > > On Tue, 2022-08-23 at 13:24 +0300, Krzysztof Kozlowski wrote: > > > On 22/08/2022 10:07, Chunfeng Yun wrote: > > > > On Fri, 2022-08-19 at 15:15 +0300, Krzysztof Kozlowski wrote: > > > > > On 19/08/2022 12:13, Chunfeng Yun wrote: > > > > > > Add a property to set usb2 phy's pre-emphasis. > > > > > > > > > > > > Signed-off-by: Chunfeng Yun > > > > > > --- > > > > > > Documentation/devicetree/bindings/phy/mediatek,tphy.yaml | > > > > > > 7 > > > > > > +++++++ > > > > > > 1 file changed, 7 insertions(+) > > > > > > > > > > > > diff --git > > > > > > a/Documentation/devicetree/bindings/phy/mediatek,tphy.yaml > > > > > > b/Documentation/devicetree/bindings/phy/mediatek,tphy.yaml > > > > > > index 848edfb1f677..aee2f3027371 100644 > > > > > > --- > > > > > > a/Documentation/devicetree/bindings/phy/mediatek,tphy.yaml > > > > > > +++ > > > > > > b/Documentation/devicetree/bindings/phy/mediatek,tphy.yaml > > > > > > @@ -219,6 +219,13 @@ patternProperties: > > > > > > minimum: 1 > > > > > > maximum: 15 > > > > > > > > > > > > + mediatek,pre-emphasis: > > > > > > + description: > > > > > > + The selection of pre-emphasis (U2 phy) > > > > > > + $ref: /schemas/types.yaml#/definitions/uint32 > > > > > > + minimum: 1 > > > > > > + maximum: 3 > > > > > > > > > > Instead of hard-coding register values in bindings, you > > > > > should > > > > > rather > > > > > describe here feature/effect. If it is in units, use unit > > > > > suffixes. > > > > > If > > > > > it is some choice, usually string enum is appropriate. > > > > > > > > How about changing description as bellow: > > > > > > > > "The level of pre-emphasis, increases one level, boosts the > > > > relative > > > > amplitudes of signal's higher frequencies components about > > > > 4.16% > > > > (U2 > > > > phy)" > > > > > > > > > > Still the question is what is the unit. 4.16%? > > > > No unit, it's a level value, like an index of array. > > > > So a value from register/device programming? Yes > Rather a regular units > should be used if that's possible. If not, this should be clearly > described here, not some magical number which you encode into DTS... Ok, I'll add more descriptions. Thanks a lot > > Best regards, > Krzysztof _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel