From patchwork Thu Feb 15 15:17:50 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Richard X-Patchwork-Id: 13558812 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1599DC48BEB for ; Thu, 15 Feb 2024 16:31:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References:Message-Id :MIME-Version:Subject:Date:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=A9umfGIJTpPKgfZCeERZ9997R5h8ZvY9j0bmEDYsjA4=; b=uEhCcZAugHNu0j sHYYJZnu083Ko+7cvilt5FOlOuWojzncLFT6XsbUzy9F2yPXQsRV0sksdHmehM+I+AdkMRtvS3rOL zbRfM6Rk3OiGv53/qm9Jk42iT2errjTpORyx16BLMS6ho3sdJ1ESOTrsBFEDhWf7k9IPqMjuADOSd AbS6mdsi+oMZiUBLMTw9IBJ22vmDy+UNihg1vvWLV6Ja6cJXf/D/8pNdbqy6ciETxBVb6gL/7Mpxs nrNhOnt2B4EzIR7ghBtZtbGznj4x8GkiBkL+nM+lINu4ABHErIeswi3C2cvRkjUE/m33sBm69nZGm kC6tTDRxV9O/hEMc2X/A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1raedV-0000000Gyqh-1M5t; Thu, 15 Feb 2024 16:30:57 +0000 Received: from relay1-d.mail.gandi.net ([2001:4b98:dc4:8::221]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1radV1-0000000GgpK-2Na0; Thu, 15 Feb 2024 15:18:09 +0000 Received: by mail.gandi.net (Postfix) with ESMTPSA id 1CEBA24000F; Thu, 15 Feb 2024 15:18:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1708010285; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=R9wanZgvZg9ml7GqR5bBizFjTTL8Y7tpLwMVbRWiGTQ=; b=h2c3O0R+H0aCNoaovxhZxz4fVFJgW/NkDJL4iE9MA9Bz5bB4Q8VUtl+qcZNa1VkafuNCvG Nh2QWFaXefaOXRuJwA1HeepNj94AJ5PRbtA5XvajB96K8R6+iEDM+Eua9YE9Ry7Iye7X4u Ec83gQy1b/PELMMhtjR8ynHlH9HaanPxGx4KfuDnTvSHlQ+bLIKxoFwKsVjb/2xmTkp+gh G0qRYloGTPFpOywJdOMsviEGR+p1ktX0l7KhCK+ZJYyBSBw56F87l6sgyFk0v+JehhmYXQ O90Sg5w+vvRoktD0MEwuP7eeBpOVjN1azXxru/XFZELdZ9L7jN4/MwooN/BlaQ== From: Thomas Richard Date: Thu, 15 Feb 2024 16:17:50 +0100 Subject: [PATCH v3 05/18] mux: add mux_chip_resume() function MIME-Version: 1.0 Message-Id: <20240102-j7200-pcie-s2r-v3-5-5c2e4a3fac1f@bootlin.com> References: <20240102-j7200-pcie-s2r-v3-0-5c2e4a3fac1f@bootlin.com> In-Reply-To: <20240102-j7200-pcie-s2r-v3-0-5c2e4a3fac1f@bootlin.com> To: Linus Walleij , Bartosz Golaszewski , Andy Shevchenko , Tony Lindgren , Haojian Zhuang , Vignesh R , Aaro Koskinen , Janusz Krzysztofik , Andi Shyti , Peter Rosin , Vinod Koul , Kishon Vijay Abraham I , Philipp Zabel , Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy?= =?utf-8?q?=C5=84ski?= , Rob Herring , Bjorn Helgaas Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-omap@vger.kernel.org, linux-i2c@vger.kernel.org, linux-phy@lists.infradead.org, linux-pci@vger.kernel.org, gregory.clement@bootlin.com, theo.lebrun@bootlin.com, thomas.petazzoni@bootlin.com, u-kumar1@ti.com, Thomas Richard X-Mailer: b4 0.12.0 X-GND-Sasl: thomas.richard@bootlin.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240215_071807_978988_9AE8F49E X-CRM114-Status: GOOD ( 13.27 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The mux_chip_resume() function restores a mux_chip using the cached state of each mux. Signed-off-by: Thomas Richard --- drivers/mux/core.c | 30 ++++++++++++++++++++++++++++++ include/linux/mux/driver.h | 1 + 2 files changed, 31 insertions(+) diff --git a/drivers/mux/core.c b/drivers/mux/core.c index 775816112932..5db5a7698ad1 100644 --- a/drivers/mux/core.c +++ b/drivers/mux/core.c @@ -215,6 +215,36 @@ void mux_chip_free(struct mux_chip *mux_chip) } EXPORT_SYMBOL_GPL(mux_chip_free); +/** + * mux_chip_resume() - restores the mux-chip state + * @mux_chip: The mux-chip to resume. + * + * Restores the mux-chip state. + * + * Return: Zero on success or a negative errno on error. + */ +int mux_chip_resume(struct mux_chip *mux_chip) +{ + int global_ret = 0; + int ret, i; + + for (i = 0; i < mux_chip->controllers; ++i) { + struct mux_control *mux = &mux_chip->mux[i]; + + if (mux->cached_state == MUX_CACHE_UNKNOWN) + continue; + + ret = mux_control_set(mux, mux->cached_state); + if (ret < 0) { + dev_err(&mux_chip->dev, "unable to restore state\n"); + if (!global_ret) + global_ret = ret; + } + } + return global_ret; +} +EXPORT_SYMBOL_GPL(mux_chip_resume); + static void devm_mux_chip_release(struct device *dev, void *res) { struct mux_chip *mux_chip = *(struct mux_chip **)res; diff --git a/include/linux/mux/driver.h b/include/linux/mux/driver.h index 18824064f8c0..2a7e5ec5d540 100644 --- a/include/linux/mux/driver.h +++ b/include/linux/mux/driver.h @@ -88,6 +88,7 @@ struct mux_chip *mux_chip_alloc(struct device *dev, int mux_chip_register(struct mux_chip *mux_chip); void mux_chip_unregister(struct mux_chip *mux_chip); void mux_chip_free(struct mux_chip *mux_chip); +int mux_chip_resume(struct mux_chip *mux_chip); struct mux_chip *devm_mux_chip_alloc(struct device *dev, unsigned int controllers,