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c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1709566576; 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=Nddqbk+pnI5GQTwJOSSeWAzxXi5gSfG5PpAV94Uq5te126mltno/izPKS64YRUTqXKDTnm +Gp5xWr6NztvDTcDfj/s1ytS/ahX7cwiNQoGEGWpS63q9eQpf+MHfqygyMrNH3PPdOVL/U pPvOKKdtZB6sGHKS+T5CM/txXhSuYxu9dXW2fBRF5uDkDiU+bc9fw1EaMRrdboy2C1E+U7 RgnAtiyRcXJiz4keIm/8ucfWJOlRtAqj9V0617CC2uTPY/YIBLj3I4La4veDTPfL+8L4Vz mZ7UDFy88LEfitW8/gzny0fz6MMMuSNKCGpurLDN1rEszy0q2htWNQt8xmeUEg== From: Thomas Richard Date: Mon, 04 Mar 2024 16:35:47 +0100 Subject: [PATCH v4 04/18] mux: add mux_chip_resume() function Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240102-j7200-pcie-s2r-v4-4-6f1f53390c85@bootlin.com> References: <20240102-j7200-pcie-s2r-v4-0-6f1f53390c85@bootlin.com> In-Reply-To: <20240102-j7200-pcie-s2r-v4-0-6f1f53390c85@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=C5=84?= =?utf-8?q?ski?= , 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-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1792610775616646246 X-GMAIL-MSGID: 1792610775616646246 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,