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 CE9E4C54EBD for ; Mon, 9 Jan 2023 19:13:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231830AbjAITNx (ORCPT ); Mon, 9 Jan 2023 14:13:53 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52714 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237592AbjAITNh (ORCPT ); Mon, 9 Jan 2023 14:13:37 -0500 Received: from mail-qt1-x830.google.com (mail-qt1-x830.google.com [IPv6:2607:f8b0:4864:20::830]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8EDE71D3 for ; Mon, 9 Jan 2023 11:13:35 -0800 (PST) Received: by mail-qt1-x830.google.com with SMTP id g7so8741060qts.1 for ; Mon, 09 Jan 2023 11:13:35 -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=Bi3oBptD5jCgR3sTIi7hFKVPfq/8Pnrqb6ZI/5Yc2j4=; b=UF7KzIkEB/fXc3KnAJ6L2rCYApHXJ8CB06AShSQq3Di2GUYTK3nvf6b0RCj6CpJy3r MK6VVRHj2SWz0naODMUrnO6nFPBpyqhQagZY0SCNwZNi+cn5QrIoFJcgJnuy7Qewy1U7 3jLhR08SpSj5pl8DVCnJ/axVrp2QDAYYAx5EQ= 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=Bi3oBptD5jCgR3sTIi7hFKVPfq/8Pnrqb6ZI/5Yc2j4=; b=j7dfjv9zU5rcyGR+8jtfLqAir2cf6F9fTptN3XBOqJgH7wP9GMkxptov5GwrP21gp5 mcNA/MrFPRJjavqVYSYziFh+WInr5jtWEZ7chSp3cwq7wb+yp5Y9ZNhEQxxgXlrGop6Y LyPqSBAy2ViD2jicGj2pW9n7Y2frs4c1Q3PFSjkZqbrFX6clU31d6zoSLaZ+m3B1YyV9 BOnViM8IxLHklnUrypW6LnydjHjT+2MKco5K+A8OziflVEY0QoThwPdyaL0vS9L5HZGy 3uphBXZ7Nou4BVXvIG0eEV+YVcqedjgTkHFn4fZaaWE3eMVUQXgkrQhOGmK06HBZNx2g FNDg== X-Gm-Message-State: AFqh2koHxivcezo2SI5u09e1mX2jzTz07d3FRAezsA7DMKhLE4h6Ynyo T7W3z2WMvqQSPxqe6KHGqEU7COaylOoMvR4sSYvJsf+NbNFMz6eGwlEYefC+yetDATk646+ggt2 ZenIKzXGB9D4tJz8yzuxIITpXnpUlvNum8gjF5JRioZBfCg/Xga5ZzwERDUJf/SdqlBeqeU2xSz p1xp11gtPYEtw= X-Google-Smtp-Source: AMrXdXuFIWS5t0Sn8XEaQ9x45dhkqpM1jcszN6yjhrjcnkzv9JUn2n5JHcRskksky0HKSjY8i70q3g== X-Received: by 2002:ac8:480b:0:b0:3a5:361f:9819 with SMTP id g11-20020ac8480b000000b003a5361f9819mr93702403qtq.18.1673291614081; Mon, 09 Jan 2023 11:13:34 -0800 (PST) Received: from bcacpedev-irv-3.lvn.broadcom.net ([192.19.161.250]) by smtp.gmail.com with ESMTPSA id z26-20020ac8101a000000b003a70a675066sm4926183qti.79.2023.01.09.11.13.31 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 09 Jan 2023 11:13:32 -0800 (PST) Subject: Re: [PATCH 02/16] dt-bindings: spi: Add bcmbca-hsspi controller support To: Krzysztof Kozlowski , Linux SPI List , Broadcom Kernel List Cc: 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 , Mark Brown , Rob Herring , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20230106200809.330769-1-william.zhang@broadcom.com> <20230106200809.330769-3-william.zhang@broadcom.com> <5dfac2d7-3b4b-9ded-0dde-26b289c604d0@broadcom.com> <99b01e96-3b96-6692-c5e1-87db49295e6d@linaro.org> From: William Zhang Message-ID: <49925933-aacc-4f0d-a1ca-e1bd45b05eee@broadcom.com> Date: Mon, 9 Jan 2023 11:13:30 -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: <99b01e96-3b96-6692-c5e1-87db49295e6d@linaro.org> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="0000000000004bc34f05f1d99078" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --0000000000004bc34f05f1d99078 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit On 01/09/2023 12:56 AM, Krzysztof Kozlowski wrote: > On 09/01/2023 09:27, William Zhang wrote: >> Hi Krzysztof, >> >> On 01/08/2023 06:51 AM, Krzysztof Kozlowski wrote: >>> On 06/01/2023 21:07, William Zhang wrote: >>>> The new Broadcom Broadband BCMBCA SoCs includes a updated HSSPI >>>> controller. Add a new compatible string and required fields for the new >>>> driver. Also add myself and Kursad as the maintainers. >>>> >>>> Signed-off-by: William Zhang >>>> --- >>>> >>>> .../bindings/spi/brcm,bcm63xx-hsspi.yaml | 84 +++++++++++++++++-- >>>> 1 file changed, 78 insertions(+), 6 deletions(-) >>>> >>>> diff --git a/Documentation/devicetree/bindings/spi/brcm,bcm63xx-hsspi.yaml b/Documentation/devicetree/bindings/spi/brcm,bcm63xx-hsspi.yaml >>>> index 45f1417b1213..56e69d4a1faf 100644 >>>> --- a/Documentation/devicetree/bindings/spi/brcm,bcm63xx-hsspi.yaml >>>> +++ b/Documentation/devicetree/bindings/spi/brcm,bcm63xx-hsspi.yaml >>>> @@ -4,22 +4,51 @@ >>>> $id: http://devicetree.org/schemas/spi/brcm,bcm63xx-hsspi.yaml# >>>> $schema: http://devicetree.org/meta-schemas/core.yaml# >>>> >>>> -title: Broadcom BCM6328 High Speed SPI controller >>>> +title: Broadcom Broadband SoC High Speed SPI controller >>>> >>>> maintainers: >>>> + >>> >>> Drop blank line. >> will fix in v2. >> >>> >>>> + - William Zhang >>>> + - Kursad Oney >>>> - Jonas Gorski >>> >>>> >>>> +description: | >>>> + Broadcom Broadband SoC supports High Speed SPI master controller since the >>>> + early MIPS based chips such as BCM6328 and BCM63268. This controller was >>>> + carried over to recent ARM based chips, such as BCM63138, BCM4908 and BCM6858. >>>> + >>>> + It has a limitation that can not keep the chip select line active between >>>> + the SPI transfers within the same SPI message. This can terminate the >>>> + transaction to some SPI devices prematurely. The issue can be worked around by >>>> + either the controller's prepend mode or using the dummy chip select >>>> + workaround. This controller uses the compatible string brcm,bcm6328-hsspi. >>>> + >>>> + The newer SoCs such as BCM6756, BCM4912 and BCM6855 include an updated SPI >>>> + controller that add the capability to allow the driver to control chip select >>>> + explicitly. This solves the issue in the old controller. This new controller >>>> + uses the compatible string brcm,bcmbca-hsspi. >>>> + >>>> properties: >>>> compatible: >>>> - const: brcm,bcm6328-hsspi >>>> + enum: >>>> + - brcm,bcm6328-hsspi >>>> + - brcm,bcmbca-hsspi >>> >>> bca seems quite unspecific. Your description above mentions several >>> model numbers and "bca" is not listed as model. Compatibles cannot be >>> generic. >> "bca" is not model number, rather it is a group (broadband carrier >> access) of chip that share the same spi host controller IP. Agree it is >> not particularly specific but it differentiate from other broadcom spi >> controller ip used by other groups. We just don't have a specific name >> for this spi host controller but can we treat bcmbca as the ip name? > > No, it is discouraged in such forms. Family or IP block compatibles > should be prepended with a specific compatible. There were many issues > when people insisted on generic or family compatibles... > >> Otherwise we will have to have a compatible string with chip model for >> each SoC even they share the same IP. We already have more than ten of >> SoCs and the list will increase. I don't see this is a good solution too. > > You will have to do it anyway even with generic fallback, so I don't get > what is here to gain... I also don't get why Broadcom should be here > special, different than others. Why it is not a good solution for > Broadcom SoCs but it is for others? > I saw a few other vendors like these qcom ones: qcom,spi-qup.yaml - qcom,spi-qup-v1.1.1 # for 8660, 8960 and 8064 - qcom,spi-qup-v2.1.1 # for 8974 and later - qcom,spi-qup-v2.2.1 # for 8974 v2 and later qcom,spi-qup.yaml const: qcom,geni-spi I guess when individual who only has one particular board/chip and is not aware of the IP family, it is understandable to use the chip specific compatible string. But when company works on it, we have the visibility and access to all the chips and ip blocks in the family and IMHO it is very reasonable to use the IP family name for the same IP as these examples shows. Are you saying these are not good example to follow? What are the issues with generic or family compatibles? Could you please elaborate? > > >> >>> >>>> >>>> reg: >>>> - maxItems: 1 >>>> + items: >>>> + - description: main registers >>>> + - description: miscellaneous control registers >>>> + minItems: 1 >>>> + >>>> + reg-names: >>>> + items: >>>> + - const: hsspi >>>> + - const: spim-ctrl >>> >>> This does not match reg >> Do you mean it does not match the description? > > No. reg can be 1 item but you state reg-names cannot. These are always > the same. If one is 1 item, second is as well. > I'll drop the "minItems: 1" from the reg property then. >>> >>>> >>>> clocks: >>>> items: >>>> - - description: spi master reference clock >>>> - - description: spi master pll clock >>>> + - description: SPI master reference clock >>>> + - description: SPI master pll clock >>> >>> Really? You just added it in previous patch, didn't you? >> The previous patch was just word to word conversion of the text file. I >> will update that patch to include this change. >> >>> >>>> >>>> clock-names: >>>> items: >>>> @@ -29,12 +58,43 @@ properties: >>>> interrupts: >>>> maxItems: 1 >>>> >>>> + brcm,use-cs-workaround: >>>> + $ref: /schemas/types.yaml#/definitions/flag >>>> + description: | >>>> + Enable dummy chip select workaround for SPI transfers that can not be >>>> + supported by the default controller's prepend mode, i.e. delay or cs >>>> + change needed between SPI transfers. >>> >>> You need to describe what is the workaround. >> Will do. >>> >>>> + >>>> required: >>>> - compatible >>>> - reg >>>> - clocks >>>> - clock-names >>>> - - interrupts >>>> + >>>> +allOf: >>>> + - $ref: "spi-controller.yaml#" >>> >>> No quotes. How this is related to this patch? >> Will remove quote and put it in patch 1. >>> >>>> + - if: >>>> + properties: >>>> + compatible: >>>> + contains: >>>> + enum: >>>> + - brcm,bcm6328-hsspi >>>> + then: >>>> + properties: >>>> + reg: >>>> + minItems: 1 >>> >>> Drop. >>> >>> reg-names now do not match. >> Don't quite understand your comment. What do I need to drop and what is >> not matched? > > You need to add constraints for reg-names, same way as for reg. > Disallowing the reg-names also could work, but there won't be benefit in > it. Better to have uniform DTS. > I agree it is better to have the uniform DTS but the situation here is that the brcm,bcm6328-hsspi does not require reg name since there is only one register needed and it was already used in many chip dts for long time. If I enforce it to have the corresponding reg name, that could potentially break the compatibility of those old device if the driver change to use reg name, right? >> > Best regards, > Krzysztof > --0000000000004bc34f05f1d99078 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 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