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: 13558635 Received: from relay1-d.mail.gandi.net (relay1-d.mail.gandi.net [217.70.183.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BF179132C01; Thu, 15 Feb 2024 15:18:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.193 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708010289; cv=none; b=BPlSfYHVCa/1LRYpJfcWjgz5yI6s8PgIkWiKqS2fGZwANFGwPtwRCzZLY7cUPBrLpnd8CT4AtTtr7e660LEkojYL/hMBHZz4mEBnuKMab42u5GA8FZm5eu3Py7qqKRvOt1tes5OmDsP9Og8DpkLgG5iNQzEIyueZR0QUUH+rkFY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708010289; c=relaxed/simple; bh=/7nB9yFoEPjkjgmvlVF2TD3aOLwcM3Gr0Gyc2U7/mrg=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=HoYDLUdVjbEKKkdzpyJW0G3BKVIPsOmGq6zCDWLWJnmcp48cy33gOKZGQJCGlNTqEUrIQHNDOhQI7zpI5GxX9B5A6pxLyNs6yhrCW1jb5KSuFEDLwLVh5JRUI5ORSEhX/PxpuznxU0TWZqghgYjs2lv8vedEdKV9/LopU9ZyhOI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=h2c3O0R+; arc=none smtp.client-ip=217.70.183.193 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="h2c3O0R+" 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 Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 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,