From patchwork Wed Oct 7 13:54:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Baryshkov X-Patchwork-Id: 11820651 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 77B056CA for ; Wed, 7 Oct 2020 13:55:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 519A421D24 for ; Wed, 7 Oct 2020 13:55:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="qRbYQiBH" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728567AbgJGNy5 (ORCPT ); Wed, 7 Oct 2020 09:54:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54492 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728550AbgJGNy5 (ORCPT ); Wed, 7 Oct 2020 09:54:57 -0400 Received: from mail-lf1-x144.google.com (mail-lf1-x144.google.com [IPv6:2a00:1450:4864:20::144]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A2112C0613E1 for ; Wed, 7 Oct 2020 06:54:53 -0700 (PDT) Received: by mail-lf1-x144.google.com with SMTP id l2so2418495lfk.0 for ; Wed, 07 Oct 2020 06:54:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=T0dKj6g81Qnwj432BHav6MjrRFfi+Md37xffdodCkkE=; b=qRbYQiBHcjjH2TflXzmSvGVGGeZI54McKn/KZO1JRw6R1Z7IilvB3Zi4PYLFER+FqJ n6b+C6yOjOD70hOX9Qt1mq2Gij0s5P1iy0fBHQ1aIYa81xp/nmfZDevL26nVgIWDybNX JB/iRVp79WI9CyNkbUAWJ0nDgTfQNtC/VP2uFngoygGlcs2h34PqurEL3RmqHYP8NnTf R8cPZeMHkKnVq5UISWwA4jr0AVxuRSYLOysiY4kVqkztJ+OrFSm8U2KIT2hJsFQyegwD FvOQIA7XacxuKhQoIdjQvQfZE3BGuI1mpSBIyFeJeWp2aJ9zmVJUqwuhhVWQ7Bqh61Qz sNJQ== 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:mime-version:content-transfer-encoding; bh=T0dKj6g81Qnwj432BHav6MjrRFfi+Md37xffdodCkkE=; b=GayukOX50mqxH5/gBekCIpFzU9oRh4rizwRfb4Uo5waWSxeK7ZR/FGJPTVJGbeZZgz aaflaEPFqBC1Q6qGpo0g5w3gRpywdZi7VQYvpNtvqisRCOo61QFz7te4vNGcHCzgnjpb GyacQSrChocgqBwLofYhWWBQFnj7mQZrGj99nmnmiFqj/lUA9pEfHpvBOgU1tpnx1fOK EOO2qn5zGKmbgsZmwytgk7/fTbqHl63XSeprbYjoGPgKQumh803MloVsBIF3tPRd1N2N 3YGapccBL7WBnrPyuF4f66RVODC5GxjXwn2NaTleaOtUYodQ5iYaDi8BBuuUF5Qw2cbH /zgQ== X-Gm-Message-State: AOAM532qRHAuJqUdz5BaNHmburu8uO/m43Mj8EH0w0K19nQ9rvqUcqme o9/8JE3SdJ2z/uIOawsmVYDn/Q== X-Google-Smtp-Source: ABdhPJwA9zlaIhqeAMNQDa/8B9h+A8FVQVbLqZXmhGXoTcj+YC3HxhvEknF2hRlIyphz0T01S7Wksw== X-Received: by 2002:a19:6911:: with SMTP id e17mr1026062lfc.479.1602078892050; Wed, 07 Oct 2020 06:54:52 -0700 (PDT) Received: from localhost.localdomain ([188.162.65.250]) by smtp.gmail.com with ESMTPSA id n3sm339768lfq.274.2020.10.07.06.54.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Oct 2020 06:54:51 -0700 (PDT) From: Dmitry Baryshkov To: Andy Gross , Bjorn Andersson , Rob Herring , Zhang Rui , Daniel Lezcano , Amit Kucheria , Jonathan Cameron , Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald-Stadler Cc: linux-arm-msm@vger.kernel.org, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-iio@vger.kernel.org, Manivannan Sadhasivam , Jishnu Prakash , Jonathan Cameron Subject: [PATCH v7 06/10] iio: provide of_iio_channel_get_by_name() and devm_ version it Date: Wed, 7 Oct 2020 16:54:29 +0300 Message-Id: <20201007135433.1041979-7-dmitry.baryshkov@linaro.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201007135433.1041979-1-dmitry.baryshkov@linaro.org> References: <20201007135433.1041979-1-dmitry.baryshkov@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org There might be cases when the IIO channel is attached to the device subnode instead of being attached to the main device node. Allow drivers to query IIO channels by using device tree nodes. Signed-off-by: Dmitry Baryshkov Reviewed-by: Jonathan Cameron --- drivers/iio/inkern.c | 34 ++++++++++++++++++++++++++-------- include/linux/iio/consumer.h | 36 ++++++++++++++++++++++++++++++++++++ 2 files changed, 62 insertions(+), 8 deletions(-) diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c index ede99e0d5371..8ff0ac472de3 100644 --- a/drivers/iio/inkern.c +++ b/drivers/iio/inkern.c @@ -180,8 +180,8 @@ static struct iio_channel *of_iio_channel_get(struct device_node *np, int index) return ERR_PTR(err); } -static struct iio_channel *of_iio_channel_get_by_name(struct device_node *np, - const char *name) +struct iio_channel *of_iio_channel_get_by_name(struct device_node *np, + const char *name) { struct iio_channel *chan = NULL; @@ -219,6 +219,7 @@ static struct iio_channel *of_iio_channel_get_by_name(struct device_node *np, return chan; } +EXPORT_SYMBOL_GPL(of_iio_channel_get_by_name); static struct iio_channel *of_iio_channel_get_all(struct device *dev) { @@ -261,12 +262,6 @@ static struct iio_channel *of_iio_channel_get_all(struct device *dev) #else /* CONFIG_OF */ -static inline struct iio_channel * -of_iio_channel_get_by_name(struct device_node *np, const char *name) -{ - return NULL; -} - static inline struct iio_channel *of_iio_channel_get_all(struct device *dev) { return NULL; @@ -382,6 +377,29 @@ struct iio_channel *devm_iio_channel_get(struct device *dev, } EXPORT_SYMBOL_GPL(devm_iio_channel_get); +struct iio_channel *devm_of_iio_channel_get_by_name(struct device *dev, + struct device_node *np, + const char *channel_name) +{ + struct iio_channel **ptr, *channel; + + ptr = devres_alloc(devm_iio_channel_free, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return ERR_PTR(-ENOMEM); + + channel = of_iio_channel_get_by_name(np, channel_name); + if (IS_ERR(channel)) { + devres_free(ptr); + return channel; + } + + *ptr = channel; + devres_add(dev, ptr); + + return channel; +} +EXPORT_SYMBOL_GPL(devm_of_iio_channel_get_by_name); + struct iio_channel *iio_channel_get_all(struct device *dev) { const char *name; diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h index c4118dcb8e05..0a90ba8fa1bb 100644 --- a/include/linux/iio/consumer.h +++ b/include/linux/iio/consumer.h @@ -13,6 +13,7 @@ struct iio_dev; struct iio_chan_spec; struct device; +struct device_node; /** * struct iio_channel - everything needed for a consumer to use a channel @@ -97,6 +98,41 @@ void iio_channel_release_all(struct iio_channel *chan); */ struct iio_channel *devm_iio_channel_get_all(struct device *dev); +/** + * of_iio_channel_get_by_name() - get description of all that is needed to access channel. + * @np: Pointer to consumer device tree node + * @consumer_channel: Unique name to identify the channel on the consumer + * side. This typically describes the channels use within + * the consumer. E.g. 'battery_voltage' + */ +#ifdef CONFIG_OF +struct iio_channel *of_iio_channel_get_by_name(struct device_node *np, const char *name); +#else +static inline struct iio_channel * +of_iio_channel_get_by_name(struct device_node *np, const char *name) +{ + return NULL; +} +#endif + +/** + * devm_of_iio_channel_get_by_name() - Resource managed version of of_iio_channel_get_by_name(). + * @dev: Pointer to consumer device. + * @np: Pointer to consumer device tree node + * @consumer_channel: Unique name to identify the channel on the consumer + * side. This typically describes the channels use within + * the consumer. E.g. 'battery_voltage' + * + * Returns a pointer to negative errno if it is not able to get the iio channel + * otherwise returns valid pointer for iio channel. + * + * The allocated iio channel is automatically released when the device is + * unbound. + */ +struct iio_channel *devm_of_iio_channel_get_by_name(struct device *dev, + struct device_node *np, + const char *consumer_channel); + struct iio_cb_buffer; /** * iio_channel_get_all_cb() - register callback for triggered capture