From patchwork Fri Jan 26 14:36:46 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Richard X-Patchwork-Id: 13532721 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 748A1C47DDF for ; Fri, 26 Jan 2024 14:38:14 +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=GhgSx0+f1uwebP1fDJqFbcLqhg5V6v2mQoAKBxWwz+8=; b=bFYoNTadSzsnUG qPMQrOQRfBIh1OkmyRUA1tG0K6JcyLcYYiElQ+oiRl50Q7irn5U8ssb4DmpiTnxPgl5ztDyXDxD3M 0339Naekdu/B8j5oDbf5QYEa6NZYm//7ogAEsgEKFfsR2P8fVrT4Fe9w40SamsfwewTG08tV3cyzD 7zVDGLxozfclA4AcG7+JzJnvymo2Y/AIVSS4Kcv8LT5Y1/E2MbwJZVEMuWrzs6mfpGKN6w/KOZupq AtDzotx8UmHular6GiyaRXPnqDKMA26n/+mo2nsTFAwXev9ZbDczmHULSnvqZu0EJeH5bSalhUee4 mD6kldM/73uFbBFPS4Pw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rTNLE-00000004N9V-2RJJ; Fri, 26 Jan 2024 14:38:00 +0000 Received: from relay2-d.mail.gandi.net ([2001:4b98:dc4:8::222]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rTNKz-00000004MxN-3tIi; Fri, 26 Jan 2024 14:37:47 +0000 Received: by mail.gandi.net (Postfix) with ESMTPSA id 564F440014; Fri, 26 Jan 2024 14:37:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1706279863; 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=Cbw3dfSNoiflIv8mn1Y7eM6xBgXjeUJCd/7i0kUTDu4=; b=HIsJspISmq9+z03H8FRmqs/PxBEH2bY6w4YjXjpYjf84eeKJKyfRd8h7X97Ckfs/vM3MN8 ajG8doZk8ZKGo0M0j2VzYTFIybcYp+s+vCjyP/8oxsw2XTGpgO2xoXsDHyJFC72xsmtC4f AXZsPD7frToR88bXP3aSHZaNt/l/vagv9KnKtzOiWYuEwG3tAnhnHslb77YNE1AKgWGWWX qNQ9WKUME2rM1gjPiHlGBxFadl0hJzjDgSgSdsUbR93+dFkFXzMl7gwvUWiR/Qv1nMJAGk 37288DOuqlcr95ZCxnsxf3sZcdeb0yMzaNJhmrcILe74lVQjnNpKzbZiaQEOvw== From: Thomas Richard Date: Fri, 26 Jan 2024 15:36:46 +0100 Subject: [PATCH v2 04/15] mux: add mux_chip_resume() function MIME-Version: 1.0 Message-Id: <20240102-j7200-pcie-s2r-v2-4-8e4f7d228ec2@bootlin.com> References: <20240102-j7200-pcie-s2r-v2-0-8e4f7d228ec2@bootlin.com> In-Reply-To: <20240102-j7200-pcie-s2r-v2-0-8e4f7d228ec2@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 , Tom Joseph , 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-20240126_063746_355307_1B38D5A0 X-CRM114-Status: GOOD ( 13.33 ) 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 | 27 +++++++++++++++++++++++++++ include/linux/mux/driver.h | 1 + 2 files changed, 28 insertions(+) diff --git a/drivers/mux/core.c b/drivers/mux/core.c index 775816112932..896f74b34eb8 100644 --- a/drivers/mux/core.c +++ b/drivers/mux/core.c @@ -215,6 +215,33 @@ 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 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) { + ret = mux_control_set(mux, mux->cached_state); + if (ret < 0) { + dev_err(&mux_chip->dev, "unable to restore state\n"); + return ret; + } + } + } + return 0; +} +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,