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From: Thomas Richard <thomas.richard@bootlin.com>
Date: Thu, 13 Jun 2024 15:07:31 +0200
Subject: [PATCH 2/2] mux: mmio: add resume support
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Message-Id: <20240613-mux-mmio-resume-support-v1-2-4525bf56024a@bootlin.com>
References: <20240613-mux-mmio-resume-support-v1-0-4525bf56024a@bootlin.com>
In-Reply-To: <20240613-mux-mmio-resume-support-v1-0-4525bf56024a@bootlin.com>
To: Peter Rosin <peda@axentia.se>
Cc: linux-kernel@vger.kernel.org, gregory.clement@bootlin.com, 
 theo.lebrun@bootlin.com, thomas.petazzoni@bootlin.com, u-kumar1@ti.com, 
 Thomas Richard <thomas.richard@bootlin.com>

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

No need to save something during the suspend stage, as the mux core has an
internal cache to store the state of muxes.

This cache is used by mux_chip_resume() to restore all muxes.

Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com>
Signed-off-by: Thomas Richard <thomas.richard@bootlin.com>
---
 drivers/mux/mmio.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/mux/mmio.c b/drivers/mux/mmio.c
index 30a952c34365..00405abe3ce3 100644
--- a/drivers/mux/mmio.c
+++ b/drivers/mux/mmio.c
@@ -130,13 +130,25 @@ 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);
 }
 
+static int mux_mmio_resume_noirq(struct device *dev)
+{
+	struct mux_chip *mux_chip = dev_get_drvdata(dev);
+
+	return mux_chip_resume(mux_chip);
+}
+
+static DEFINE_NOIRQ_DEV_PM_OPS(mux_mmio_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 = pm_sleep_ptr(&mux_mmio_pm_ops),
 	},
 	.probe = mux_mmio_probe,
 };

-- 
2.39.2