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 D9D49C433FE for ; Tue, 3 May 2022 20:42:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239246AbiECUpw (ORCPT ); Tue, 3 May 2022 16:45:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52268 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238429AbiECUpu (ORCPT ); Tue, 3 May 2022 16:45:50 -0400 Received: from mail-pj1-x1033.google.com (mail-pj1-x1033.google.com [IPv6:2607:f8b0:4864:20::1033]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 099B22B181 for ; Tue, 3 May 2022 13:42:17 -0700 (PDT) Received: by mail-pj1-x1033.google.com with SMTP id o69so14995874pjo.3 for ; Tue, 03 May 2022 13:42:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=enwzkf5ZdXvLdRACYMry17JrbQXYDS1pzt1swgdYs2Y=; b=CDEL5/8UwxNVlA69+9fUSELJuKYF4UfFfTarYqphwV6sDRC2si6CUIWM7xMWqz1HsH xBhp+7l9cRvxg8uQxSEfTKkxomSfAzjhn6dzWMzYTrtiP0rkv+5zSKW+hbKk5WwI1+AF KIeVBvib/aebJEVLRcU4HgkfGl5E19chgZ3hc= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=enwzkf5ZdXvLdRACYMry17JrbQXYDS1pzt1swgdYs2Y=; b=vGYg50Eu5ZPkVCMZSsZMzrCpR8euJoH+JEjsp2TiaWZiz9ZDkwloexIWHNXvnYag/j h+r6r27yt6OvwV2e2i6jiXzp8TLRGr8L0yGbuBi2LMInrlfA7I5LzO5QGh9YvZmIrGul Y7AE/EhhvZQLn6fJrzAQMDYYIC5l/hWYkkkJ+NEkA9ZuaYu1fQeh10yDOqPKDOOnhXaH aaYXPR1+MuHTOuugFtObmiFEsiLcLikwAfQqFcstWH3Cq6Mp0HS8f3cSXI+qJ1nNNi3L wXN2mw8MzgfD9gorzK8HFMuk69NdzL4wPGiXkq3VXJr0oGrK4ErBQeD+7+5fYzvhvOCE LNSA== X-Gm-Message-State: AOAM532MTytCKd2Y3fam6Z0dfecV/EfXF9myJMCzPcPFHuVwTjP/DAcT b1vV2GHUufGW3rcHhFU3v1HAig== X-Google-Smtp-Source: ABdhPJy5Dih4SuPbCN0Hp6Lnj2x+Aa2NSYQ+B9RysQ5ieQjpS5cX7BNB8hdFxfLc3a74JbbP6DSqnA== X-Received: by 2002:a17:902:7006:b0:156:3cbe:6b04 with SMTP id y6-20020a170902700600b001563cbe6b04mr18156451plk.68.1651610536531; Tue, 03 May 2022 13:42:16 -0700 (PDT) Received: from smtp.gmail.com ([2620:15c:202:201:15e:c760:9a04:7fbe]) by smtp.gmail.com with ESMTPSA id x18-20020aa79192000000b0050dc76281e4sm6702081pfa.190.2022.05.03.13.42.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 May 2022 13:42:15 -0700 (PDT) From: Stephen Boyd To: Dmitry Torokhov Cc: linux-kernel@vger.kernel.org, patches@lists.linux.dev, chrome-platform@lists.linux.dev, Krzysztof Kozlowski , Rob Herring , devicetree@vger.kernel.org, Benson Leung , Guenter Roeck , Douglas Anderson , Hsin-Yi Wang , "Joseph S. Barrera III" Subject: [PATCH v4 1/2] dt-bindings: google,cros-ec-keyb: Introduce switches only compatible Date: Tue, 3 May 2022 13:42:11 -0700 Message-Id: <20220503204212.3907925-2-swboyd@chromium.org> X-Mailer: git-send-email 2.36.0.464.gb9c8b46e94-goog In-Reply-To: <20220503204212.3907925-1-swboyd@chromium.org> References: <20220503204212.3907925-1-swboyd@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org If the ChromeOS board is a detachable, this cros-ec-keyb device won't have a matrix keyboard but it may have some button switches, e.g. volume buttons and power buttons. The driver still registers a keyboard though and that leads to userspace confusion around where the keyboard is. We tried to work around this in commit 4352e23a7ff2 ("Input: cros-ec-keyb - only register keyboard if rows/columns exist") but that led to another problem where removing the rows/columns properties breaks the binding[1]. Technically before that commit the rows/columns properties were required, otherwise the driver would fail to probe. Removing the properties from devicetrees makes the driver fail to probe unless the corresponding driver patch is present. Furthermore, this makes requiring matrix keyboard properties for devices that really have a keyboard impossible because the compatible drives the schema and now the properties are optional. Add a more specific compatible for this type of device that indicates to the OS that there are only switches and no matrix keyboard present. If only the switches compatible is present, then the matrix keyboard properties are denied. Otherwise, as long as the "google,cros-ec-keyb" copmatible is present, the matrix keyboard properties are required. This more clearly describes what the driver was expecting, i.e. that the kernel driver would fail to probe if the linux,{rows,cols,keymap} properties are missing and the "google,cros-ec-keyb" compatible is present. If the new "google,cros-ec-keyb-switches" compatible is present then the matrix keyboard properties are likely to be ignored by any modern driver, but they're still allowed per the binding if "google,cros-ec-keyb" is present to conform to the original binding and to keep the driver probing when used with newer DTBs. This lets us gracefully migrate devices that only have switches over to the new compatible string and properly enforce the "google,cros-ec-keyb" binding at the same time. Eventually we'll be able to use only "google,cros-ec-keyb-switches" or "google,cros-ec-keyb" when the driver support has baked for a release or two, but we'll always support the combined compatible list so that DTBs can be mixed and matched with kernels, no dependency between the two binaries is required. Link: https://lore.kernel.org/r/CAD=FV=Wey2P_=3Lp6M8GEaoyCn1XcYFhfJwfx43a5f_8H0obwg@mail.gmail.com [1] Reviewed-by: Krzysztof Kozlowski Cc: Rob Herring Cc: Cc: Benson Leung Cc: Guenter Roeck Reviewed-by: Douglas Anderson Cc: Hsin-Yi Wang Cc: "Joseph S. Barrera III" Signed-off-by: Stephen Boyd --- .../bindings/input/google,cros-ec-keyb.yaml | 87 +++++++++++++++++-- 1 file changed, 81 insertions(+), 6 deletions(-) diff --git a/Documentation/devicetree/bindings/input/google,cros-ec-keyb.yaml b/Documentation/devicetree/bindings/input/google,cros-ec-keyb.yaml index e8f137abb03c..00a88c4234d1 100644 --- a/Documentation/devicetree/bindings/input/google,cros-ec-keyb.yaml +++ b/Documentation/devicetree/bindings/input/google,cros-ec-keyb.yaml @@ -15,14 +15,19 @@ description: | Google's ChromeOS EC Keyboard is a simple matrix keyboard implemented on a separate EC (Embedded Controller) device. It provides a message for reading key scans from the EC. These are then converted - into keycodes for processing by the kernel. - -allOf: - - $ref: "/schemas/input/matrix-keymap.yaml#" + into keycodes for processing by the kernel. This device also supports + switches/buttons like power and volume buttons. properties: compatible: - const: google,cros-ec-keyb + oneOf: + - items: + - const: google,cros-ec-keyb-switches + - items: + - const: google,cros-ec-keyb-switches + - const: google,cros-ec-keyb + - items: + - const: google,cros-ec-keyb google,needs-ghost-filter: description: @@ -41,15 +46,32 @@ properties: where the lower 16 bits are reserved. This property is specified only when the keyboard has a custom design for the top row keys. +dependencies: + function-row-phsymap: [ 'linux,keymap' ] + google,needs-ghost-filter: [ 'linux,keymap' ] + required: - compatible +if: + properties: + compatible: + contains: + const: google,cros-ec-keyb +then: + allOf: + - $ref: "/schemas/input/matrix-keymap.yaml#" + required: + - keypad,num-rows + - keypad,num-columns + - linux,keymap + unevaluatedProperties: false examples: - | #include - cros-ec-keyb { + keyboard-controller { compatible = "google,cros-ec-keyb"; keypad,num-rows = <8>; keypad,num-columns = <13>; @@ -113,3 +135,56 @@ examples: /* UP LEFT */ 0x070b0067 0x070c0069>; }; + + - | + keyboard-controller { + compatible = "google,cros-ec-keyb-switches", "google,cros-ec-keyb"; + /* Matrix keymap properties are required but ignored */ + keypad,num-rows = <8>; + keypad,num-columns = <13>; + linux,keymap = < + /* CAPSLCK F1 B F10 */ + 0x0001003a 0x0002003b 0x00030030 0x00040044 + /* N = R_ALT ESC */ + 0x00060031 0x0008000d 0x000a0064 0x01010001 + /* F4 G F7 H */ + 0x0102003e 0x01030022 0x01040041 0x01060023 + /* ' F9 BKSPACE L_CTRL */ + 0x01080028 0x01090043 0x010b000e 0x0200001d + /* TAB F3 T F6 */ + 0x0201000f 0x0202003d 0x02030014 0x02040040 + /* ] Y 102ND [ */ + 0x0205001b 0x02060015 0x02070056 0x0208001a + /* F8 GRAVE F2 5 */ + 0x02090042 0x03010029 0x0302003c 0x03030006 + /* F5 6 - \ */ + 0x0304003f 0x03060007 0x0308000c 0x030b002b + /* R_CTRL A D F */ + 0x04000061 0x0401001e 0x04020020 0x04030021 + /* S K J ; */ + 0x0404001f 0x04050025 0x04060024 0x04080027 + /* L ENTER Z C */ + 0x04090026 0x040b001c 0x0501002c 0x0502002e + /* V X , M */ + 0x0503002f 0x0504002d 0x05050033 0x05060032 + /* L_SHIFT / . SPACE */ + 0x0507002a 0x05080035 0x05090034 0x050B0039 + /* 1 3 4 2 */ + 0x06010002 0x06020004 0x06030005 0x06040003 + /* 8 7 0 9 */ + 0x06050009 0x06060008 0x0608000b 0x0609000a + /* L_ALT DOWN RIGHT Q */ + 0x060a0038 0x060b006c 0x060c006a 0x07010010 + /* E R W I */ + 0x07020012 0x07030013 0x07040011 0x07050017 + /* U R_SHIFT P O */ + 0x07060016 0x07070036 0x07080019 0x07090018 + /* UP LEFT */ + 0x070b0067 0x070c0069>; + }; + - | + /* No matrix keyboard, just buttons/switches */ + keyboard-controller { + compatible = "google,cros-ec-keyb-switches"; + }; +... -- https://chromeos.dev