From patchwork Tue Apr 16 13:29:52 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Richard X-Patchwork-Id: 789515 Received: from relay2-d.mail.gandi.net (relay2-d.mail.gandi.net [217.70.183.194]) (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 851AC12D219; Tue, 16 Apr 2024 13:30:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.194 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713274224; cv=none; b=YQnjjM7BHY0IEw18Lh3q3bKts3LUTd2nfchil+YIlSxPwGJKjILcnCJ7ix4FYR76mDLTEf/yFeA/9T4dxrYs7ryUh3Vnid+jhHAth2FMDZLgWXujETLnm10IeCRBFjDCBh/y3gv7o09Wpol5j/kSR7e8vOc3BHBKdKMpqSGbz/k= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713274224; c=relaxed/simple; bh=bhAcdQhNVtJ/WY7T35xnlNhq8WgY2YmZ/UU091QPnqA=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=SWDUqJzqUvcxm1pnyCtvygp0/K5p/qG0tXmYC6bongln0GhrlmdvKiIZGorLKGJc5FQ7dTChBuP/4VeidzEl9wasq3YJFjmZ+3A2RdYd9D6QAlQNV/UipS7Gen327lnptMNdZxq2410qJnE2HCFHo7KssMefKBJhXzGgaSzttAs= 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=kzUh70Vr; arc=none smtp.client-ip=217.70.183.194 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="kzUh70Vr" Received: by mail.gandi.net (Postfix) with ESMTPSA id CFF0A40003; Tue, 16 Apr 2024 13:30:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1713274214; 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=N+wkZZoLT0Vq8kTdRlFm+WcHMzeYn9ukxLpZ0zVifpE=; b=kzUh70Vrr4eagnn1vKXVoieorCICcHWLdjzCIVFkuVcRjIywXs6GpVRYI21bGiut28ZERY plMS5KQD7MEEFWSz9A9Hs2rXj0mr4EQDx4XXuihwHXv+xn/5bFVdka3/q0E6kHlgNVJtZw TYwk13IUo79YaWs/1dWzCr5Du4tTPccdaTdc7ZIqXhI4LhI5KyKdyVUaRz/pxEKKEG7Vmu i7SN3aogCjZ/IllAYWg0m+Vkg8lBvz35dRyOBRdN2AJHxxbiVvk0q7Xo7Sc0iW0j33uSu+ npMeqIvd62V9pOCv7yRvabfumVQCXgNCSSj1HCTRIR5lqUDjsuxSA/wEhBuwqA== From: Thomas Richard Date: Tue, 16 Apr 2024 15:29:52 +0200 Subject: [PATCH v5 03/11] mux: add mux_chip_resume() function Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240102-j7200-pcie-s2r-v5-3-4b8c46711ded@bootlin.com> References: <20240102-j7200-pcie-s2r-v5-0-4b8c46711ded@bootlin.com> In-Reply-To: <20240102-j7200-pcie-s2r-v5-0-4b8c46711ded@bootlin.com> To: Linus Walleij , Bartosz Golaszewski , Tony Lindgren , Aaro Koskinen , Janusz Krzysztofik , Vignesh R , Andi Shyti , Peter Rosin , Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy?= =?utf-8?q?=C5=84ski?= , Rob Herring , Bjorn Helgaas , Siddharth Vadapalli Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, linux-i2c@vger.kernel.org, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.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 | 29 +++++++++++++++++++++++++++++ include/linux/mux/driver.h | 1 + 2 files changed, 30 insertions(+) diff --git a/drivers/mux/core.c b/drivers/mux/core.c index 775816112932..0742aa2a7c73 100644 --- a/drivers/mux/core.c +++ b/drivers/mux/core.c @@ -215,6 +215,35 @@ 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) + continue; + + 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,