From patchwork Wed May 15 10:01:05 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Richard X-Patchwork-Id: 13665041 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 12522C25B7A for ; Wed, 15 May 2024 10:02:00 +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=RH130CNrhC7ByQ3gsrKp1KgJ4juaChIbBR5P54BtLBQ=; b=F8HYkFIEujmB3z TADZS1eR0xPRmO7DEvXsNYrM77mJpLZ5kLZAuZz3Hc89/DUHVjLvW77xK0voonIu3wJ1FD+sjAdVO 5GmhbU1Z/DvAXnFyiI+VcSWYYuPJxyPYV2RiE/5zkkOxxeE9egaSb+qlWGiFyjEH/qVQxz6sTRjbn S4NQLDgCAKcwPxOEFlKSldAmd4lniL1g0tD2nKoW8emWBZ63Jq8QpgAd5AFD8W/M1jU69EM7dWjCE 8/uQKyRzAKcgGKQDApjmC8xvdtDJbRK+Vhwh/a0dL8GI+x5mGubDFLuOJD25n7qzmhBZScRCAIZlP nVfITGprJmGfMgNV3bxg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1s7BS8-00000001AM1-3dLr; Wed, 15 May 2024 10:01:40 +0000 Received: from relay8-d.mail.gandi.net ([2001:4b98:dc4:8::228]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1s7BS0-00000001AFE-0yss for linux-arm-kernel@lists.infradead.org; Wed, 15 May 2024 10:01:34 +0000 Received: by mail.gandi.net (Postfix) with ESMTPSA id B6D1D1BF210; Wed, 15 May 2024 10:01:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1715767290; 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=cNBRb8zBe+JjMEZF6FT1jsL9U4lBNAlJGwJ8GS5VMrImE4s0mjD0BJKL7wretuCqvmeNi0 pd1TNX1ChQG0UrHj3htbepPRSyXAiKWpO4VX6FGZDy/iEhA5aQBZLvAfGKtg/YKF0O18vC +H5zg1Zb8yCBDdAqBr7DvDZHtFdlxGSsC7o3nwqN0m4B3eWtzpazkj/CANyenJss7M4iT1 sEL/05ypLF5l4uoAXFXnWn3xY8hnV1UbM0YFOiE4yYOqhfpVJ6kfKtQbBdLJc4/BVwDzRN xkSZN8+Q10U6mn7dNxUKjf65IbSZZgXc5l2rEnYA4jQiac+hm/HUy+QzWyOELQ== From: Thomas Richard Date: Wed, 15 May 2024 12:01:05 +0200 Subject: [PATCH v6 04/12] mux: add mux_chip_resume() function MIME-Version: 1.0 Message-Id: <20240102-j7200-pcie-s2r-v6-4-4656ef6e6d66@bootlin.com> References: <20240102-j7200-pcie-s2r-v6-0-4656ef6e6d66@bootlin.com> In-Reply-To: <20240102-j7200-pcie-s2r-v6-0-4656ef6e6d66@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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240515_030132_722740_B1A4EEB7 X-CRM114-Status: GOOD ( 13.63 ) 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 | 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,