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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A4C86C433EF for ; Wed, 8 Jun 2022 11:03:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237622AbiFHLDi (ORCPT ); Wed, 8 Jun 2022 07:03:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37250 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237318AbiFHLDS (ORCPT ); Wed, 8 Jun 2022 07:03:18 -0400 Received: from alexa-out.qualcomm.com (alexa-out.qualcomm.com [129.46.98.28]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6DD0F3BBFC; Wed, 8 Jun 2022 04:03:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1654686195; x=1686222195; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=ULqB0ALK4yryKpsKlIUBRMiV9B3k9ExYEunco0gOzrU=; b=e2XbjhxABY0Ftk5mOV28bnpV94hELbAn/NtNK6GymmLNzJytbKDvaD1q SpTtM5aIZGQFRTjzJwLbr3f7YQaQyNgnETupKYhptZavEhNy9XQ9Q8HKC wtpXT0hCr5a1qQMfkYyEHGnHso9wINmw9GYTUATnOviO+3r4/Rde+f/ik s=; Received: from ironmsg07-lv.qualcomm.com ([10.47.202.151]) by alexa-out.qualcomm.com with ESMTP; 08 Jun 2022 04:03:15 -0700 X-QCInternal: smtphost Received: from nasanex01c.na.qualcomm.com ([10.47.97.222]) by ironmsg07-lv.qualcomm.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Jun 2022 04:03:14 -0700 Received: from nalasex01a.na.qualcomm.com (10.47.209.196) by nasanex01c.na.qualcomm.com (10.47.97.222) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.22; Wed, 8 Jun 2022 04:03:14 -0700 Received: from [10.216.33.38] (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.22; Wed, 8 Jun 2022 04:03:07 -0700 Message-ID: <5c4f814e-1e5a-1c82-def6-7aba5d0cfd94@quicinc.com> Date: Wed, 8 Jun 2022 16:33:04 +0530 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.9.0 Subject: Re: [PATCH v8 1/3] dt-bindings: phy: qcom,usb-snps-femto-v2: Add phy override params bindings Content-Language: en-US To: Krzysztof Kozlowski , Krzysztof Kozlowski , Rob Herring , "Andy Gross" , Bjorn Andersson , Greg Kroah-Hartman , Stephen Boyd , Doug Anderson , "Matthias Kaehlcke" , Wesley Cheng CC: , , , , , , , , Sandeep Maheswaram References: <1654066564-20518-1-git-send-email-quic_kriskura@quicinc.com> <1654066564-20518-2-git-send-email-quic_kriskura@quicinc.com> <00cf0a30-46d5-f566-af35-9f7c33ec4182@linaro.org> From: Krishna Kurapati PSSNV In-Reply-To: <00cf0a30-46d5-f566-af35-9f7c33ec4182@linaro.org> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01a.na.qualcomm.com (10.47.209.196) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 6/8/2022 3:06 PM, Krzysztof Kozlowski wrote: > On 01/06/2022 08:56, Krishna Kurapati wrote: >> From: Sandeep Maheswaram >> >> Add device tree bindings for SNPS phy tuning parameters. >> >> Signed-off-by: Sandeep Maheswaram >> Signed-off-by: Krishna Kurapati >> Reviewed-by: Krzysztof Kozlowski >> --- >> .../bindings/phy/qcom,usb-snps-femto-v2.yaml | 96 ++++++++++++++++++++++ >> 1 file changed, 96 insertions(+) >> >> diff --git a/Documentation/devicetree/bindings/phy/qcom,usb-snps-femto-v2.yaml b/Documentation/devicetree/bindings/phy/qcom,usb-snps-femto-v2.yaml >> index 1ce251d..daeeb04 100644 >> --- a/Documentation/devicetree/bindings/phy/qcom,usb-snps-femto-v2.yaml >> +++ b/Documentation/devicetree/bindings/phy/qcom,usb-snps-femto-v2.yaml >> @@ -53,6 +53,102 @@ properties: >> vdda33-supply: >> description: phandle to the regulator 3.3V supply node. >> >> + qcom,hs-disconnect-bp: >> + description: >> + This adjusts the voltage level for the threshold used to >> + detect a disconnect event at the host. Possible values are. >> + The values defined are in multiples of basis points (1bp = 0.01%). >> + The hardware accepts only discrete values. The value closest to the >> + provided input will be chosen as the override value for this param. >> + minimum: -272 >> + maximum: 2156 >> + >> + qcom,squelch-detector-bp: >> + description: >> + This adjusts the voltage level for the threshold used to >> + detect valid high-speed data. >> + The values defined are in multiples of basis points (1bp = 0.01%). >> + The hardware accepts only discrete values. The value closest to the >> + provided input will be chosen as the override value for this param. >> + minimum: -2090 >> + maximum: 1590 >> + >> + qcom,hs-amplitude-bp: >> + description: >> + This adjusts the high-speed DC level voltage. >> + The values defined are in multiples of basis points (1bp = 0.01%). >> + The hardware accepts only discrete values. The value closest to the >> + provided input will be chosen as the override value for this param. >> + minimum: -660 >> + maximum: 2670 >> + >> + qcom,pre-emphasis-duration-bp: >> + description: >> + This signal controls the duration for which the >> + HS pre-emphasis current is sourced onto DP<#> or DM<#>. >> + The HS Transmitter pre-emphasis duration is defined in terms of >> + unit amounts. One unit of pre-emphasis duration is approximately >> + 650 ps and is defined as 1X pre-emphasis duration. >> + The values defined are in multiples of basis points (1bp = 0.01%). >> + The hardware accepts only discrete values. The value closest to the >> + provided input will be chosen as the override value for this param. >> + minimum: 10000 >> + maximum: 20000 >> + >> + qcom,pre-emphasis-amplitude-bp: >> + description: >> + This signal controls the amount of current sourced to >> + DP<#> and DM<#> after a J-to-K or K-to-J transition. >> + The HS Transmitter pre-emphasis current is defined in terms of unit >> + amounts. One unit amount is approximately 2 mA and is defined as >> + 1X pre-emphasis current. >> + The values defined are in multiples of basis points (1bp = 0.01%). >> + The hardware accepts only discrete values. The value closest to the >> + provided input will be chosen as the override value for this param. >> + minimum: 10000 >> + maximum: 40000 >> + >> + qcom,hs-rise-fall-time-bp: >> + description: >> + This adjusts the rise/fall times of the high-speed waveform. >> + The values defined are in multiples of basis points (1bp = 0.01%). >> + The hardware accepts only discrete values. The value closest to the >> + provided input will be chosen as the override value for this param. >> + minimum: -4100 >> + maximum: 5430 >> + >> + qcom,hs-crossover-voltage-microvolt: >> + description: >> + This adjusts the voltage at which the DP<#> and DM<#> >> + signals cross while transmitting in HS mode. >> + The values defined are in milli volts. > It's not accurate anymore - it's microvolt. I propose to skip this one > sentence, because unit is obvious from the type. > >> + maximum: 28000 >> + >> + qcom,hs-output-impedance-micro-ohms: >> + description: >> + In some applications, there can be significant series resistance >> + on the D+ and D- paths between the transceiver and cable. This adjusts >> + the driver source impedance to compensate for added series >> + resistance on the USB. The values defined are in milli ohms. > The same. Other places might need similar change. > > Best regards, > Krzysztof Hi Krzysztof,     Sure, will modify the description for all the params. Regards, Krishna,