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 95AC2C54EBE for ; Sat, 7 Jan 2023 03:27:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229686AbjAGD1k (ORCPT ); Fri, 6 Jan 2023 22:27:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36906 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229985AbjAGD1i (ORCPT ); Fri, 6 Jan 2023 22:27:38 -0500 Received: from mail-pl1-x634.google.com (mail-pl1-x634.google.com [IPv6:2607:f8b0:4864:20::634]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A144B8CD08 for ; Fri, 6 Jan 2023 19:27:37 -0800 (PST) Received: by mail-pl1-x634.google.com with SMTP id jn22so3670991plb.13 for ; Fri, 06 Jan 2023 19:27:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=in-reply-to:mime-version:user-agent:date:message-id:from:references :cc:to:subject:from:to:cc:subject:date:message-id:reply-to; bh=jYZzb0U4OU6XLkvH3Qcfc1mhz0esmobByJdUsz5/DYk=; b=GhLcULY+XaMSgL7f8GZviMNr9vfCZVeTnuY53uFfBrEvqIqbXwYk39TBMOi3FIaqr9 sgv0cOUlQnlPhwjrJrQoKhWWcZ1ZaTAm5CfHfGMX9QobzIgTfs8nTEljtXzbRapt5bNp 6WUfajueUcEa88KmC07f5u83DPvPeB7PmStww= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:mime-version:user-agent:date:message-id:from:references :cc:to:subject:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=jYZzb0U4OU6XLkvH3Qcfc1mhz0esmobByJdUsz5/DYk=; b=Xdm45Q2MeIi+o5vCDY6v3nUbOb+yN8qusFShCSljMR4tKAWHdbMyPv3wNlv06/PIik tvuWtYaEElqDHUw/TmnF4w5O6MU8CU/YwEsh9JsHOY8wnfSzes4W5krLUTMPMk9hjTYt vdjYf3LXuOvSjilcqJstqQHWb9g32hLRQpWrBTb09aAPS9ATHJtzBwMl5ZeAQ/VN8P3Y KO9WEQTxpSA81dxWXrIUV4rsw/n8pjwDsv086j5KZa9O5ICdu3lgROeTY+caM2+k3K6h rEimMvPUwYTKa+CgqZnTVA7/83Hnmnlj2ZhLF7XtVoxZ3BcUb9q+1I29t977FFChvPOL qOeQ== X-Gm-Message-State: AFqh2krq44iaOW+4KwMJUajRRaGPvUQ8qU05sGejQLkYJzINr+EfSm2+ 4y7Vb6PcS/+WHLRzn+m+4VMVPdbldQoN2rzC1vX9ULFOEwJeP85vjWt13tGZket19jJhMsV09+Y YeJBKmOOppxJjQe9ScDsYvq5Y5bxNrBTwYB12hm6vBlrCd16hyci6OkKREgnnXmTDGDmLgIgMkw R3N9/uzylCt9s= X-Google-Smtp-Source: AMrXdXuMz/toCYDKKdI5MtIQJXNm+5g1RMBs6R8uEWATXi6Z4DruBn6icDBxwIojuxvEfVSW6Icuxw== X-Received: by 2002:a05:6a20:4904:b0:9d:efbf:8156 with SMTP id ft4-20020a056a20490400b0009defbf8156mr76255830pzb.31.1673062056738; Fri, 06 Jan 2023 19:27:36 -0800 (PST) Received: from bcacpedev-irv-3.lvn.broadcom.net ([192.19.161.250]) by smtp.gmail.com with ESMTPSA id d7-20020a631d47000000b004a849d3d9c2sm1492646pgm.22.2023.01.06.19.27.34 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 06 Jan 2023 19:27:35 -0800 (PST) Subject: Re: [PATCH 03/16] dt-bindings: spi: Add spi peripheral specific property To: Mark Brown Cc: Linux SPI List , Broadcom Kernel List , anand.gore@broadcom.com, tomer.yacoby@broadcom.com, dan.beygelman@broadcom.com, joel.peshkin@broadcom.com, f.fainelli@gmail.com, jonas.gorski@gmail.com, kursad.oney@broadcom.com, dregan@mail.com, Krzysztof Kozlowski , Rob Herring , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20230106200809.330769-1-william.zhang@broadcom.com> <20230106200809.330769-4-william.zhang@broadcom.com> From: William Zhang Message-ID: <3ff9a7fa-25dd-701c-078e-03e47bd3c08b@broadcom.com> Date: Fri, 6 Jan 2023 19:27:34 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="0000000000009aef2c05f1a41dad" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --0000000000009aef2c05f1a41dad Content-Type: text/plain; charset=windows-1252; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Hi Mark, On 01/06/2023 01:14 PM, Mark Brown wrote: > On Fri, Jan 06, 2023 at 12:07:55PM -0800, William Zhang wrote: > >> brcm,no-clk-gate is a Broadcom Broadband HS SPI controller specific >> property for certain SPI device such as Broadcom ISI voice daughtercard >> to work properly. It disables the clock gating feature when the chip >> select is deasserted for any device that wants to keep the clock >> running. > > Why would this property be Broadcom specific? Other devices could in > theory implement this. > It does not need to be Broadcom specific if other SoC's SPI bus controller support such function. I am not aware of such case but certainly I am no expert on other chips. I can put it in the generic spi-peripheral-props.yaml if that is what you suggest. >> +properties: >> + brcm,no-clk-gate: >> + $ref: /schemas/types.yaml#/definitions/flag >> + description: >> + Some SPI device such as Broadcom ISI based voice daughtercard requires SPI >> + clock running even when chip select is deasserted. By default the >> + controller turns off or gate the clock when cs is not active to save >> + power. This flag tells the controller driver to keep the clock running >> + when chip select is not active. > > This seems problematic with any host controlled chip select support... > Yes those ISI chip based voice cards do need such strange requirement and will not work with other controller. That is one of the reason I put this as Broadcom specific option. --0000000000009aef2c05f1a41dad Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQcAYJKoZIhvcNAQcCoIIQYTCCEF0CAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg3HMIIFDTCCA/WgAwIBAgIQeEqpED+lv77edQixNJMdADANBgkqhkiG9w0BAQsFADBMMSAwHgYD VQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEGA1UEChMKR2xvYmFsU2lnbjETMBEGA1UE AxMKR2xvYmFsU2lnbjAeFw0yMDA5MTYwMDAwMDBaFw0yODA5MTYwMDAwMDBaMFsxCzAJBgNVBAYT AkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMTEwLwYDVQQDEyhHbG9iYWxTaWduIEdDQyBS MyBQZXJzb25hbFNpZ24gMiBDQSAyMDIwMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA vbCmXCcsbZ/a0fRIQMBxp4gJnnyeneFYpEtNydrZZ+GeKSMdHiDgXD1UnRSIudKo+moQ6YlCOu4t rVWO/EiXfYnK7zeop26ry1RpKtogB7/O115zultAz64ydQYLe+a1e/czkALg3sgTcOOcFZTXk38e aqsXsipoX1vsNurqPtnC27TWsA7pk4uKXscFjkeUE8JZu9BDKaswZygxBOPBQBwrA5+20Wxlk6k1 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