linux-kernel - [PATCH 04/14] mux: mmio: Add resume support

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Date: Mon, 15 Jan 2024 17:14:45 +0100
From: Thomas Richard <thomas.richard@...tlin.com>
To: Linus Walleij <linus.walleij@...aro.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>, Andy Shevchenko <andy@...nel.org>, 
 Tony Lindgren <tony@...mide.com>, 
 Haojian Zhuang <haojian.zhuang@...aro.org>, Vignesh R <vigneshr@...com>, 
 Aaro Koskinen <aaro.koskinen@....fi>, 
 Janusz Krzysztofik <jmkrzyszt@...il.com>, 
 Andi Shyti <andi.shyti@...nel.org>, Peter Rosin <peda@...ntia.se>, 
 Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>, 
 Philipp Zabel <p.zabel@...gutronix.de>, Tom Joseph <tjoseph@...ence.com>, 
 Lorenzo Pieralisi <lpieralisi@...nel.org>, 
 Krzysztof Wilczyński <kw@...ux.com>, 
 Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org, 
 linux-i2c@...r.kernel.org, linux-phy@...ts.infradead.org, 
 linux-pci@...r.kernel.org, gregory.clement@...tlin.com, 
 theo.lebrun@...tlin.com, thomas.petazzoni@...tlin.com, u-kumar1@...com, 
 Thomas Richard <thomas.richard@...tlin.com>
Subject: [PATCH 04/14] mux: mmio: Add resume support

From: Théo Lebrun <theo.lebrun@...tlin.com>

Implement resume support

Signed-off-by: Théo Lebrun <theo.lebrun@...tlin.com>
Signed-off-by: Thomas Richard <thomas.richard@...tlin.com>
---
 drivers/mux/mmio.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/drivers/mux/mmio.c b/drivers/mux/mmio.c
index fd1d121a584b..ab4ef195fc0d 100644
--- a/drivers/mux/mmio.c
+++ b/drivers/mux/mmio.c
@@ -125,13 +125,47 @@ static int mux_mmio_probe(struct platform_device *pdev)
 
 	mux_chip->ops = &mux_mmio_ops;
 
+	dev_set_drvdata(dev, mux_chip);
+
 	return devm_mux_chip_register(dev, mux_chip);
 }
 
+#ifdef CONFIG_PM
+static int mux_mmio_resume_noirq(struct device *dev)
+{
+	struct mux_chip *mux_chip = dev_get_drvdata(dev);
+	int global_ret = 0;
+	unsigned int i;
+
+	for (i = 0; i < mux_chip->controllers; i++) {
+		struct mux_control *mux = &mux_chip->mux[i];
+		int val = mux->cached_state;
+		int ret;
+
+		if (val == MUX_IDLE_AS_IS)
+			continue;
+
+		ret = mux_mmio_set(mux, val);
+		if (ret) {
+			dev_err(dev, "control %u: error restoring mux: %d\n", i, ret);
+			if (!global_ret)
+				global_ret = ret;
+		}
+	}
+
+	return global_ret;
+}
+#endif
+
+static const struct dev_pm_ops mux_mmio_pm_ops = {
+	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(NULL, mux_mmio_resume_noirq)
+};
+
 static struct platform_driver mux_mmio_driver = {
 	.driver = {
 		.name = "mmio-mux",
 		.of_match_table	= mux_mmio_dt_ids,
+		.pm = &mux_mmio_pm_ops,
 	},
 	.probe = mux_mmio_probe,
 };

-- 
2.39.2