From patchwork Wed May 20 16:34:06 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jonathan Albrieux X-Patchwork-Id: 11560741 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 97A6414C0 for ; Wed, 20 May 2020 16:34:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7B84C207D3 for ; Wed, 20 May 2020 16:34:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="qf7BxExE" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726737AbgETQe7 (ORCPT ); Wed, 20 May 2020 12:34:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47580 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726439AbgETQe6 (ORCPT ); Wed, 20 May 2020 12:34:58 -0400 Received: from mail-qt1-x842.google.com (mail-qt1-x842.google.com [IPv6:2607:f8b0:4864:20::842]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4EFC2C061A0E; Wed, 20 May 2020 09:34:58 -0700 (PDT) Received: by mail-qt1-x842.google.com with SMTP id d7so3003315qtn.11; Wed, 20 May 2020 09:34:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=4DcJwL2bU+Q1cyGNmrdNE1LFRPb0Wm0rIUdCoQbv6t8=; b=qf7BxExE0J9oLfvmPOqyphafL+TXfeyhAP1CgcgPqBwFVZx8cJjl+9GrNOOYTaccx9 9zBEsCjMT94/7h+ofxek0485ak8taGeJApSxO9bWCD8aTjIkKZFloHpZyCFiXmCKlQon d09OGbmY1eOvi/Ho9ZCiLx1Rle11XJPO4Wua5ER1hCBt6GRfO2/RSiQ1bLyGRXjOyXfc 3edCaAOT3R+arpPrKmGqKwzTDj8AAf13OFXt/FqntZBON819WsQxec622o4OifICNo51 0JcTe38kzdrnmTVSKmk7EfcVyPiDfpVx06RVtC6leaEV86jADHkGnqcKipBNZbjXDoT+ HmIg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=4DcJwL2bU+Q1cyGNmrdNE1LFRPb0Wm0rIUdCoQbv6t8=; b=hpwZNud1zyw7hty6L8IJcYM0CfDdg8oSPHr8XQo83CAKX5Ovian9E1X7fzQhK3cB7a qe6BQ4jKkPYIrWR+qKqUXlvCDiZNzyCn4atyFKmcvDPDfwLSKbRYYbCj1kgLWw22Smww qF0BW4DlA0lYlcO+Sa6OikZ5SacXMjdoqLyOjYfOb0EfiaT7PDJ9zpW6JcRiRS3d4W7i QNxGHkQEhfnNzcNcAx6c46GkkGyEAhB/6ShAp+2OoawRfUu1Xw2bSIzrTXEYZFW1rlXv eELeERKTX9M/T6NSjZsioL0TnC+3v6o/3LuZ+YsjJfFCvFmQeAAA4PyFkz3rt/C2iRB6 GzNQ== X-Gm-Message-State: AOAM532xWQPv0KCgvyKs6mE9UKaPvrWPllR67eVqLAwdcvrQSd9cMhNS bUomwbwNIF35QSMiPcVwEhGAQlfgZ+g8tQ== X-Google-Smtp-Source: ABdhPJwh18cjMohI6agOjoqojb3Df1BhgY/cyVXPTJDLct010vimClSnkMuQ8lFm7BD8IwPfBhy3Kg== X-Received: by 2002:ac8:3693:: with SMTP id a19mr6233689qtc.226.1589992496704; Wed, 20 May 2020 09:34:56 -0700 (PDT) Received: from ict14-OptiPlex-980.kataweb.it ([178.23.248.46]) by smtp.googlemail.com with ESMTPSA id q59sm2803261qtd.73.2020.05.20.09.34.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 May 2020 09:34:55 -0700 (PDT) From: Jonathan Albrieux To: linux-kernel@vger.kernel.org Cc: ~postmarketos/upstreaming@lists.sr.ht, Jonathan Albrieux , Andy Shevchenko , devicetree@vger.kernel.org (open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS), Greg Kroah-Hartman , Hartmut Knaack , Jilayne Lovejoy , Jonathan Cameron , Kate Stewart , Lars-Peter Clausen , Linus Walleij , linux-iio@vger.kernel.org (open list:IIO SUBSYSTEM AND DRIVERS), Peter Meerwald-Stadler , Steve Winslow , Thomas Gleixner , Jonathan Cameron , Rob Herring Subject: [PATCH v5 1/4] dt-bindings: iio: magnetometer: ak8975: convert format to yaml, add maintainer Date: Wed, 20 May 2020 18:34:06 +0200 Message-Id: <20200520163417.27805-2-jonathan.albrieux@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200520163417.27805-1-jonathan.albrieux@gmail.com> References: <20200520163417.27805-1-jonathan.albrieux@gmail.com> Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Converts documentation from txt format to yaml. Signed-off-by: Jonathan Albrieux --- .../bindings/iio/magnetometer/ak8975.txt | 30 -------- .../bindings/iio/magnetometer/ak8975.yaml | 71 +++++++++++++++++++ 2 files changed, 71 insertions(+), 30 deletions(-) delete mode 100644 Documentation/devicetree/bindings/iio/magnetometer/ak8975.txt create mode 100644 Documentation/devicetree/bindings/iio/magnetometer/ak8975.yaml diff --git a/Documentation/devicetree/bindings/iio/magnetometer/ak8975.txt b/Documentation/devicetree/bindings/iio/magnetometer/ak8975.txt deleted file mode 100644 index aa67ceb0d4e0..000000000000 --- a/Documentation/devicetree/bindings/iio/magnetometer/ak8975.txt +++ /dev/null @@ -1,30 +0,0 @@ -* AsahiKASEI AK8975 magnetometer sensor - -Required properties: - - - compatible : should be "asahi-kasei,ak8975" - - reg : the I2C address of the magnetometer - -Optional properties: - - - gpios : should be device tree identifier of the magnetometer DRDY pin - - vdd-supply: an optional regulator that needs to be on to provide VDD - - mount-matrix: an optional 3x3 mounting rotation matrix - -Example: - -ak8975@c { - compatible = "asahi-kasei,ak8975"; - reg = <0x0c>; - gpios = <&gpj0 7 0>; - vdd-supply = <&ldo_3v3_gnss>; - mount-matrix = "-0.984807753012208", /* x0 */ - "0", /* y0 */ - "-0.173648177666930", /* z0 */ - "0", /* x1 */ - "-1", /* y1 */ - "0", /* z1 */ - "-0.173648177666930", /* x2 */ - "0", /* y2 */ - "0.984807753012208"; /* z2 */ -}; diff --git a/Documentation/devicetree/bindings/iio/magnetometer/ak8975.yaml b/Documentation/devicetree/bindings/iio/magnetometer/ak8975.yaml new file mode 100644 index 000000000000..8bde423a2ffa --- /dev/null +++ b/Documentation/devicetree/bindings/iio/magnetometer/ak8975.yaml @@ -0,0 +1,71 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/iio/magnetometer/ak8975.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: AsahiKASEI AK8975 magnetometer sensor + +maintainers: + - Jonathan Albrieux + +properties: + compatible: + oneOf: + - const: asahi-kasei,ak8975 + - const: asahi-kasei,ak8963 + - const: asahi-kasei,ak09911 + - const: asahi-kasei,ak09912 + - const: ak8975 + deprecated: true + - const: ak8963 + deprecated: true + - const: ak09911 + deprecated: true + - const: ak09912 + deprecated: true + + reg: + maxItems: 1 + description: the I2C address of the magnetometer + + gpios: + description: should be device tree identifier of the magnetometer DRDY pin + + vdd-supply: + maxItems: 1 + description: | + an optional regulator that needs to be on to provide VDD power to + the sensor. + + mount-matrix: + description: an optional 3x3 mounting rotation matrix + +required: + - compatible + - reg + +examples: + - | + #include + i2c@78b7000 { + reg = <0x78b6000 0x600>; + #address-cells = <1>; + #size-cells = <0>; + + magnetometer@c { + compatible = "asahi-kasei,ak8975"; + reg = <0x0c>; + gpios = <&gpj0 7 GPIO_ACTIVE_HIGH>; + vdd-supply = <&ldo_3v3_gnss>; + mount-matrix = "-0.984807753012208", /* x0 */ + "0", /* y0 */ + "-0.173648177666930", /* z0 */ + "0", /* x1 */ + "-1", /* y1 */ + "0", /* z1 */ + "-0.173648177666930", /* x2 */ + "0", /* y2 */ + "0.984807753012208"; /* z2 */ + }; + }; From patchwork Wed May 20 16:34:07 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jonathan Albrieux X-Patchwork-Id: 11560743 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 87E6914C0 for ; Wed, 20 May 2020 16:35:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 70E9A207D4 for ; Wed, 20 May 2020 16:35:04 +0000 (UTC) Authentication-Results: mail.kernel.org; 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Wed, 20 May 2020 09:35:01 -0700 (PDT) From: Jonathan Albrieux To: linux-kernel@vger.kernel.org Cc: ~postmarketos/upstreaming@lists.sr.ht, Jonathan Albrieux , Andy Shevchenko , devicetree@vger.kernel.org (open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS), Greg Kroah-Hartman , Hartmut Knaack , Jilayne Lovejoy , Jonathan Cameron , Kate Stewart , Lars-Peter Clausen , Linus Walleij , linux-iio@vger.kernel.org (open list:IIO SUBSYSTEM AND DRIVERS), Peter Meerwald-Stadler , Steve Winslow , Thomas Gleixner , Jonathan Cameron , Rob Herring Subject: [PATCH v5 2/4] dt-bindings: iio: magnetometer: ak8975: add gpio reset support Date: Wed, 20 May 2020 18:34:07 +0200 Message-Id: <20200520163417.27805-3-jonathan.albrieux@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200520163417.27805-1-jonathan.albrieux@gmail.com> References: <20200520163417.27805-1-jonathan.albrieux@gmail.com> Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Add reset-gpio support. Without reset's deassertion during ak8975_power_on(), driver's probe fails on ak8975_who_i_am() while checking for device identity for AK09911 chip. AK09911 has an active low reset gpio to handle register's reset. AK09911 datasheet says that, if not used, reset pin should be connected to VID. This patch emulates this situation. Signed-off-by: Jonathan Albrieux --- .../devicetree/bindings/iio/magnetometer/ak8975.yaml | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/Documentation/devicetree/bindings/iio/magnetometer/ak8975.yaml b/Documentation/devicetree/bindings/iio/magnetometer/ak8975.yaml index 8bde423a2ffa..aba9ced7b6da 100644 --- a/Documentation/devicetree/bindings/iio/magnetometer/ak8975.yaml +++ b/Documentation/devicetree/bindings/iio/magnetometer/ak8975.yaml @@ -41,6 +41,11 @@ properties: mount-matrix: description: an optional 3x3 mounting rotation matrix + reset-gpio: + description: | + an optional pin needed for AK09911 to set the reset state. This should + be usually active low + required: - compatible - reg @@ -58,6 +63,7 @@ examples: reg = <0x0c>; gpios = <&gpj0 7 GPIO_ACTIVE_HIGH>; vdd-supply = <&ldo_3v3_gnss>; + reset-gpio = <&msmgpio 111 GPIO_ACTIVE_LOW>; mount-matrix = "-0.984807753012208", /* x0 */ "0", /* y0 */ "-0.173648177666930", /* z0 */ From patchwork Wed May 20 16:34:08 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jonathan Albrieux X-Patchwork-Id: 11560745 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3B96814C0 for ; Wed, 20 May 2020 16:35:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2454D207D4 for ; Wed, 20 May 2020 16:35:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="i/NqEwfS" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726439AbgETQfI (ORCPT ); Wed, 20 May 2020 12:35:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47606 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726940AbgETQfI (ORCPT ); Wed, 20 May 2020 12:35:08 -0400 Received: from mail-qk1-x742.google.com (mail-qk1-x742.google.com [IPv6:2607:f8b0:4864:20::742]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D0E41C061A0E; Wed, 20 May 2020 09:35:07 -0700 (PDT) Received: by mail-qk1-x742.google.com with SMTP id f189so4189251qkd.5; Wed, 20 May 2020 09:35:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=hOveqjYBk1+7IoXrKWjzzpmC29NQEFV/46uICdldkHU=; b=i/NqEwfSn6fny5bwdxssM+Tj1jdR5N7IBdteCHjKjC/cx2IzKd2f8sGIPabD1oIiYp Ub32TAdMo7Eb003px2GOSSOK/42DvkP04s2F+2Hv4JBYH+3fEO3putFlHqU8KGgD8pcO 2IhTb0OVamoawZLXJKIBQV/vcYccljzTmVHEXPYrrks8z24FPWAIwGOzmttnN27Agwf1 EVQUkYAjsmbhQSzSW5owi4KG3MbJZ+ziN8KnYIHP4029XuDQ8tCl7pTVGAHtDRdA5iuy wAtZA6rvLfoxwAXSW4TeKJDs2O2C7vTRvtEMU4qiKtD9YBrJygF4OkNMQm3ypW2wtoXe jg1Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=hOveqjYBk1+7IoXrKWjzzpmC29NQEFV/46uICdldkHU=; b=nXnF3XgUMlkIFRYfi6WoOH6t5yTYbDA12mMGdZJUSIAwx2Ty7GcIVr17IBeOBXUTHA Olw/mSIYXgCZlNy3sephnOx4PXxPoWFDRQ/k2ndNVvumcILIDSomgvcTKqd7LBLxDkAv APM6unVNE/OXmQOWlnye1Tbpk2BeBzkA9FuYl7a7CEKKzKRsBEAG+Nk7BFqFxZRBS1Y3 mvbrHtDakj011yRe3Hb8/6h1Pe4I3H3tVFthTv8X247wpN/uDG6YkukJ0+Suh/f46DTA VpY94TY7+YQPFV3o/5gdIxITIjffzk7jQ99ktrvVQYKtlK61xwzomu/yGNGkwGW+J8sl Fy+g== X-Gm-Message-State: AOAM533s+X0ZcDiFwf1271kaTzE/Iov2NXFG9FZgKDfITYCiiZYKFwYs AlyT/A6/XkakBUqvpdc9ShA+5ERiZolddg== X-Google-Smtp-Source: ABdhPJwRnGZRJIwG0Sp+0NdyDkVdX/R0Q6oPPIkz8JETiXQXbMpPcOx1in9Yli7akkKArDW242u2Iw== X-Received: by 2002:a37:943:: with SMTP id 64mr5435261qkj.14.1589992506670; Wed, 20 May 2020 09:35:06 -0700 (PDT) Received: from ict14-OptiPlex-980.kataweb.it ([178.23.248.46]) by smtp.googlemail.com with ESMTPSA id q59sm2803261qtd.73.2020.05.20.09.35.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 May 2020 09:35:06 -0700 (PDT) From: Jonathan Albrieux To: linux-kernel@vger.kernel.org Cc: ~postmarketos/upstreaming@lists.sr.ht, Jonathan Albrieux , Andy Shevchenko , devicetree@vger.kernel.org (open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS), Greg Kroah-Hartman , Hartmut Knaack , Jilayne Lovejoy , Jonathan Cameron , Kate Stewart , Lars-Peter Clausen , Linus Walleij , linux-iio@vger.kernel.org (open list:IIO SUBSYSTEM AND DRIVERS), Peter Meerwald-Stadler , Steve Winslow , Thomas Gleixner , Jonathan Cameron , Allison Randal Subject: [PATCH v5 3/4] iio: magnetometer: ak8975: Fix typo, uniform measurement unit style Date: Wed, 20 May 2020 18:34:08 +0200 Message-Id: <20200520163417.27805-4-jonathan.albrieux@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200520163417.27805-1-jonathan.albrieux@gmail.com> References: <20200520163417.27805-1-jonathan.albrieux@gmail.com> Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Minor comment style edits. Signed-off-by: Jonathan Albrieux Reviewed-by: Andy Shevchenko --- drivers/iio/magnetometer/ak8975.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c index 3c881541ae72..fd368455cd7b 100644 --- a/drivers/iio/magnetometer/ak8975.c +++ b/drivers/iio/magnetometer/ak8975.c @@ -385,9 +385,9 @@ static int ak8975_power_on(const struct ak8975_data *data) return ret; } /* - * According to the datasheet the power supply rise time i 200us + * According to the datasheet the power supply rise time is 200us * and the minimum wait time before mode setting is 100us, in - * total 300 us. Add some margin and say minimum 500us here. + * total 300us. Add some margin and say minimum 500us here. */ usleep_range(500, 1000); return 0; From patchwork Wed May 20 16:34:09 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jonathan Albrieux X-Patchwork-Id: 11560747 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id F0AF4159A for ; Wed, 20 May 2020 16:35:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D9C6A207F9 for ; Wed, 20 May 2020 16:35:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Nlq5nfjd" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726959AbgETQfN (ORCPT ); Wed, 20 May 2020 12:35:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47620 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726939AbgETQfM (ORCPT ); Wed, 20 May 2020 12:35:12 -0400 Received: from mail-qk1-x743.google.com (mail-qk1-x743.google.com [IPv6:2607:f8b0:4864:20::743]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 53E4FC061A0E; Wed, 20 May 2020 09:35:12 -0700 (PDT) Received: by mail-qk1-x743.google.com with SMTP id f189so4189491qkd.5; Wed, 20 May 2020 09:35:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=ru/VedSe7R+1+BFX/X1C1fyozp4gv15sJxfe6kqv7eI=; b=Nlq5nfjdQYcHX7zuihr1ObqPMAidDgxveeyFHIQQ7O9LGWYgpBFhwvwsgqqYMjwc5s RA2apLZKDvKsPMKXMg/AE4qFdbrEI1TZw96L5ME1jwd6CcnN/YvSgi4ZcyXxpvrftE2D 9FKSV7VtZ9Wm5bliE6BjuHB97TJzdramHadvRcVHq9FXeo+KPe5OZVByx3eJJGg2kVEa sJbJNSAzopb/Rzy9cTjpnFAbe/r3b6Huh7UwSS1YvOZjsAFj55pZNHF0J9eXbJP6b5Vr 3j5xaZc+CSPb4DE1rbqFVNtgiqHcwPzDj3fYw5riUITT8pwaYauKrjLcGRE6Ht99+O8q RilA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=ru/VedSe7R+1+BFX/X1C1fyozp4gv15sJxfe6kqv7eI=; b=tGhRy7GmU0pPP2QRdOQVFbhcZ9Imp3YhwcC96pwFMP1aD2M3xiUTehsqdrimnI0s41 MsnuRG7VJ1V4whTlw0cm5uFHyLrujHseIluTxsQ7ne2jEs1IEKZ1EGJb6wvo3poj8wzd pPO5vted8y/QIb27iE7nQbnZOKwt/w7PbQF2y9tFskdim1RNLltH6MG5+xDWCG7a019T EOOPMo1XHuarWzWIqXLk7gmAXqrOhglTUKISXN8UsRmU9ss3hw/4dLGJiF7gR5kvKIzq kV1GQkZysSNQ0295WLcAvnbk6gVwHlOujVYafu0j+FQeOBdVHpbbGGgTfX/KDBg+JAeA I9Bg== X-Gm-Message-State: AOAM5306kIRX629nX1luGrczYAFz3B5KPTkrXK1Po/wQlgv/1N/aDXN9 NeW6PIIzDu03mO/HJ0UhNG6yq84KDiQ+cQ== X-Google-Smtp-Source: ABdhPJwgqPZSyTS3lDP8SPde5lXqTuj9YJ2uc8noId+dOCF8OR+0eN0IGtVc5ore5UFo4ycYXVwv0A== X-Received: by 2002:ae9:e854:: with SMTP id a81mr5759199qkg.396.1589992511156; Wed, 20 May 2020 09:35:11 -0700 (PDT) Received: from ict14-OptiPlex-980.kataweb.it ([178.23.248.46]) by smtp.googlemail.com with ESMTPSA id q59sm2803261qtd.73.2020.05.20.09.35.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 May 2020 09:35:10 -0700 (PDT) From: Jonathan Albrieux To: linux-kernel@vger.kernel.org Cc: ~postmarketos/upstreaming@lists.sr.ht, Jonathan Albrieux , Andy Shevchenko , devicetree@vger.kernel.org (open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS), Greg Kroah-Hartman , Hartmut Knaack , Jilayne Lovejoy , Jonathan Cameron , Kate Stewart , Lars-Peter Clausen , Linus Walleij , linux-iio@vger.kernel.org (open list:IIO SUBSYSTEM AND DRIVERS), Peter Meerwald-Stadler , Steve Winslow , Thomas Gleixner , Jonathan Cameron Subject: [PATCH v5 4/4] iio: magnetometer: ak8975: Add gpio reset support Date: Wed, 20 May 2020 18:34:09 +0200 Message-Id: <20200520163417.27805-5-jonathan.albrieux@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200520163417.27805-1-jonathan.albrieux@gmail.com> References: <20200520163417.27805-1-jonathan.albrieux@gmail.com> Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org According to AK09911 datasheet, if reset gpio is provided then deassert reset on ak8975_power_on() and assert reset on ak8975_power_off(). Without reset's deassertion during ak8975_power_on(), driver's probe fails on ak8975_who_i_am() while checking for device identity for AK09911 chip. AK09911 has an active low reset gpio to handle register's reset. AK09911 datasheet says that, if not used, reset pin should be connected to VID. This patch emulates this situation. Signed-off-by: Jonathan Albrieux Reviewed-by: Andy Shevchenko Reviewed-by: Stephan Gerhold --- drivers/iio/magnetometer/ak8975.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c index fd368455cd7b..a23422aad97d 100644 --- a/drivers/iio/magnetometer/ak8975.c +++ b/drivers/iio/magnetometer/ak8975.c @@ -358,6 +358,7 @@ struct ak8975_data { u8 asa[3]; long raw_to_gauss[3]; struct gpio_desc *eoc_gpiod; + struct gpio_desc *reset_gpiod; int eoc_irq; wait_queue_head_t data_ready_queue; unsigned long flags; @@ -384,6 +385,9 @@ static int ak8975_power_on(const struct ak8975_data *data) "Failed to enable specified Vid supply\n"); return ret; } + + gpiod_set_value_cansleep(data->reset_gpiod, 0); + /* * According to the datasheet the power supply rise time is 200us * and the minimum wait time before mode setting is 100us, in @@ -396,6 +400,8 @@ static int ak8975_power_on(const struct ak8975_data *data) /* Disable attached power regulator if any. */ static void ak8975_power_off(const struct ak8975_data *data) { + gpiod_set_value_cansleep(data->reset_gpiod, 1); + regulator_disable(data->vid); regulator_disable(data->vdd); } @@ -839,6 +845,7 @@ static int ak8975_probe(struct i2c_client *client, struct ak8975_data *data; struct iio_dev *indio_dev; struct gpio_desc *eoc_gpiod; + struct gpio_desc *reset_gpiod; const void *match; unsigned int i; int err; @@ -856,6 +863,16 @@ static int ak8975_probe(struct i2c_client *client, if (eoc_gpiod) gpiod_set_consumer_name(eoc_gpiod, "ak_8975"); + /* + * According to AK09911 datasheet, if reset GPIO is provided then + * deassert reset on ak8975_power_on() and assert reset on + * ak8975_power_off(). + */ + reset_gpiod = devm_gpiod_get_optional(&client->dev, + "reset", GPIOD_OUT_HIGH); + if (IS_ERR(reset_gpiod)) + return PTR_ERR(reset_gpiod); + /* Register with IIO */ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); if (indio_dev == NULL) @@ -866,6 +883,7 @@ static int ak8975_probe(struct i2c_client *client, data->client = client; data->eoc_gpiod = eoc_gpiod; + data->reset_gpiod = reset_gpiod; data->eoc_irq = 0; err = iio_read_mount_matrix(&client->dev, "mount-matrix", &data->orientation);