From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id CCF14ECAAD4 for ; Tue, 30 Aug 2022 10:18:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:From:References:Cc:To: Subject:MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=9Z6dDtqgbH0yCQ8s1p077LZzOQRMujMVjZ9k6maZZ6g=; b=IgSk37o1a+IdSz KCRJB98DJem+o7cuht/WS2D1NtY+UBr09AQLZRwtwB4ttwWCvP8q+Xp3/onmSFs4YMcCQ1q7pnUg0 Xpw06C1/MmMsxzBV4rGfSdf+L4bGYEjw5DOfE2jXwtZNOAqnrGFPD66QIPXQhoZc1wzJlE/zFMZLy iTJeSZyczXyhO6t7V2HD1FwqkjpuWXUE/BjXI1wT87JUUvuRqmNLa3u6heOmCL3DBxy8oDHwUPPL1 ZBm7ZIej7Npd9e280DbpiBWw48WKDeW+DsMgmZIPEiNKSNxfVJ4eNd9ek4+g/gWPmkzVEsjQ/7GUN hisdTHt+rSJ8i6c1n08A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oSyIm-00G5S6-DS; Tue, 30 Aug 2022 10:17:00 +0000 Received: from mail-lj1-x22e.google.com ([2a00:1450:4864:20::22e]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oSyAm-00G2NU-B3 for linux-arm-kernel@lists.infradead.org; Tue, 30 Aug 2022 10:08:46 +0000 Received: by mail-lj1-x22e.google.com with SMTP id z23so7947205ljk.1 for ; Tue, 30 Aug 2022 03:08:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=content-transfer-encoding:in-reply-to:from:references:cc:to :content-language:subject:user-agent:mime-version:date:message-id :from:to:cc; bh=N19Eu9EqzaEkmTOBC0jt5FngYVfZh2rgh5ndZ/dTCTc=; b=fxY1lsTV62zsGEKiAo+a4wIiGAnUlTtBgxmUiOIuraruijHHX7JxfwK8AruouU3V5z yNpy8yVxgX3UDYVfwzyZj20vPm5C7xx4nPAfFuRt43/IOWKZGZdVUv71gtAdIbzzUZBZ VCcrn2jz89xJ08pbAyuP8RA4dnznTXQZOnfYeGtwyAuXEhdEwebJBgb+EqIYAcYBpCuI /lQVHLNw7lohBvkP4omqr7WVq2uvD9ZwzsD/VoENpxWfP30ewIFUplgygxOOYamixiVl nRB0ruMGSAxpswVujcDIhQNNjlCc6JAoG95gt/1cD+8mWNbKMnIxx3tHBeu9ezRh4OXZ qAXg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:in-reply-to:from:references:cc:to :content-language:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc; bh=N19Eu9EqzaEkmTOBC0jt5FngYVfZh2rgh5ndZ/dTCTc=; b=FpQpgB4IzJ5KmUrSdeMNtrTam9DFc/fJj9ud7lUgZ8FEVmvWjUnjLAidrPvPKbjyVf SbrOpY8naX3GOVcdFr8FibswD7PQobCHytjpzmnKrP1I3bOjkkp0eOp3XEp7UTEZvzyr iJPdlCT69I20cGumG8u+C+R8xn51P/VoraUB0vbRno/DMx2HFhno3GZaQYyJh7zquSe0 NPQGojEAOZxdzhEXwEglNsNmvYun1nNe1RmDBwg8mSC/JlupqJPUBjk58SJ+rV/yhnwv Gvy0RHT7T6L4j16IYJLoGvBLNrf14Ox1JIJygYBeYGVwHqRaUsdxs8Chg3vjuocJx2XX tsfw== X-Gm-Message-State: ACgBeo3CBdT8aonOqxlNgqhAq5Lj1tBhaLmznTIg01A312bMyZo7Ag3v YFHOzDBHkc0fttNfrYxFhVJ5IQ== X-Google-Smtp-Source: AA6agR62Niuw49b9olkAq7JO7drsxcXqoumzcv5joCz4jLIeKX8wzpv7EC+9+YmDlwyXzeP004eSEw== X-Received: by 2002:a2e:93d0:0:b0:266:9e7b:9748 with SMTP id p16-20020a2e93d0000000b002669e7b9748mr1517754ljh.441.1661854122525; Tue, 30 Aug 2022 03:08:42 -0700 (PDT) Received: from [192.168.28.124] (balticom-73-99-134.balticom.lv. [109.73.99.134]) by smtp.gmail.com with ESMTPSA id z24-20020a2eb538000000b00261b58cbf03sm947843ljm.87.2022.08.30.03.08.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 30 Aug 2022 03:08:42 -0700 (PDT) Message-ID: <0a82842d-283c-e266-84f4-6306f29b61da@linaro.org> Date: Tue, 30 Aug 2022 13:08:40 +0300 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.13.0 Subject: Re: [PATCH 2/7] dt-bindings: phy: mediatek,tphy: add property to set pre-emphasis Content-Language: en-US To: Chunfeng Yun , Vinod Koul , Rob Herring Cc: Kishon Vijay Abraham I , Krzysztof Kozlowski , Matthias Brugger , linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-phy@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Eddie Hung 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> <114c357f8d7f049d21ede789a292a8e2d45f4c61.camel@mediatek.com> From: Krzysztof Kozlowski In-Reply-To: <114c357f8d7f049d21ede789a292a8e2d45f4c61.camel@mediatek.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220830_030844_454023_94DD838D X-CRM114-Status: GOOD ( 13.08 ) 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 29/08/2022 05:37, Chunfeng Yun wrote: > 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. Better use logical value, e.g. https://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/property-units.yaml#L38 Best regards, Krzysztof _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel