From patchwork Mon Sep 14 15:48:06 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Baryshkov X-Patchwork-Id: 11774351 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 B341C618 for ; Mon, 14 Sep 2020 15:50:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 969CA20E65 for ; Mon, 14 Sep 2020 15:50:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="DvEdx7uD" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726035AbgINPtx (ORCPT ); Mon, 14 Sep 2020 11:49:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49926 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726573AbgINPtQ (ORCPT ); Mon, 14 Sep 2020 11:49:16 -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 733CEC0611C1 for ; Mon, 14 Sep 2020 08:48:39 -0700 (PDT) Received: by mail-lf1-x144.google.com with SMTP id y2so13946247lfy.10 for ; Mon, 14 Sep 2020 08:48:39 -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=DvEdx7uD1/Zm3rie/uQ6tlufOEMmdWvcII2jHXVVel4u2swQZFQSMvH6BqNLhvfD9+ 5+6yCk7Z1zPLfj4pjx3x0WSitD+lB0ZySJw0mufbyM7v7C+JfVgHvS0esu59ICNHzuhQ nDSLHSeSpsIZxjWRPGeeLlUdBFeWQxSs4Z/6DyBd9rMGt4VmiXw2591CAp6h++6E6msB L90gSFQ0g1lBouovnGPDpAOecxNoDCKqhL00hf0SIxVcm890ghJFpjLo60gPV4UvI+SI YI79imbUY6rDDEfcxKd47KravGlMLrRZhyOumMe7z9KdNJd7D1CZuYsZs7vHO5vbq5nB jOxQ== 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=uiIGdWG/GkAFrUN3UL0T80eJI0k9xjT1tLajHd9i07tV8dhDOiOipDEy5FNO3PH6d2 2Ghd0LZNDzJd2AxTkBeyLj1Ld6pkDn1n385HqQ4KMZwE256dFjiILqIgDC/qngHLwjy7 ZpCQdnsLYYcQwr0iRNNapjXPRhCFtWIBwLVlS5N21Uarscs0P/VQuvfV0cN7YAKLmRgC QLU/BXScNfypm0187KMZN+GlmRnHi2K95nXkys0dVprjlNobzwLQxl3C9+Qq2pfwlYVR qkP/5KzlfMEocg5gRP4qM2Ygsv0enZ++wisbOVOqe5w6j4ofKytI/F91U5kCiyBqef7z ga/Q== X-Gm-Message-State: AOAM532dM8H6F7Yiw52vbBe8LHfCDYQ/6MxrzcF/BMU5QEcMX7Cbcgpm wt0ue5iQYfJWcUTt/YdVEp49qA== X-Google-Smtp-Source: ABdhPJxpreMtAjyot/Y1yFq/EFSN298wN9LEBfZrtPeSJ5Df+KCkBFo+mxAaspxhUPh+O8mvCi7GUw== X-Received: by 2002:ac2:5586:: with SMTP id v6mr5523469lfg.71.1600098517844; Mon, 14 Sep 2020 08:48:37 -0700 (PDT) Received: from eriador.lan ([188.162.64.187]) by smtp.gmail.com with ESMTPSA id f19sm3834650lfs.85.2020.09.14.08.48.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 14 Sep 2020 08:48:37 -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 , Jonathan Cameron Subject: [PATCH v5 6/9] iio: provide of_iio_channel_get_by_name() and devm_ version it Date: Mon, 14 Sep 2020 18:48:06 +0300 Message-Id: <20200914154809.192174-7-dmitry.baryshkov@linaro.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200914154809.192174-1-dmitry.baryshkov@linaro.org> References: <20200914154809.192174-1-dmitry.baryshkov@linaro.org> MIME-Version: 1.0 Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@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