linux-kernel - [PATCH v14 4/4] i2c: muxes: pca954x: Add regulator support

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Message-Id: <20230501091552.847240-5-patrick.rudolph@9elements.com>
Date:   Mon,  1 May 2023 11:15:51 +0200
From:   Patrick Rudolph <patrick.rudolph@...ements.com>
To:     Peter Rosin <peda@...ntia.se>
Cc:     Patrick Rudolph <patrick.rudolph@...ements.com>,
        Andi Shyti <andi.shyti@...nel.org>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v14 4/4] i2c: muxes: pca954x: Add regulator support

Add a vdd regulator and enable it for boards that have the
mux powered off by default.

Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>
Reviewed-by: Andi Shyti <andi.shyti@...nel.org>
---
 drivers/i2c/muxes/i2c-mux-pca954x.c | 28 +++++++++++++++++++++++-----
 1 file changed, 23 insertions(+), 5 deletions(-)

diff --git a/drivers/i2c/muxes/i2c-mux-pca954x.c b/drivers/i2c/muxes/i2c-mux-pca954x.c
index 968111442625..b863f7b18190 100644
--- a/drivers/i2c/muxes/i2c-mux-pca954x.c
+++ b/drivers/i2c/muxes/i2c-mux-pca954x.c
@@ -49,6 +49,7 @@
 #include <linux/module.h>
 #include <linux/pm.h>
 #include <linux/property.h>
+#include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <dt-bindings/mux/mux.h>
@@ -101,6 +102,7 @@ struct pca954x {
 	struct irq_domain *irq;
 	unsigned int irq_mask;
 	raw_spinlock_t lock;
+	struct regulator *supply;
 };
 
 /* Provide specs for the MAX735x, PCA954x and PCA984x types we know about */
@@ -444,6 +446,8 @@ static void pca954x_cleanup(struct i2c_mux_core *muxc)
 	struct pca954x *data = i2c_mux_priv(muxc);
 	int c, irq;
 
+	regulator_disable(data->supply);
+
 	if (data->irq) {
 		for (c = 0; c < data->chip->nchans; c++) {
 			irq = irq_find_mapping(data->irq, c);
@@ -496,10 +500,22 @@ static int pca954x_probe(struct i2c_client *client)
 	i2c_set_clientdata(client, muxc);
 	data->client = client;
 
+	data->supply = devm_regulator_get(dev, "vdd");
+	if (IS_ERR(data->supply))
+		return dev_err_probe(dev, PTR_ERR(data->supply),
+				"Failed to request regulator\n");
+
+	ret = regulator_enable(data->supply);
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "Failed to enable vdd supply\n");
+
 	/* Reset the mux if a reset GPIO is specified. */
 	gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
-	if (IS_ERR(gpio))
-		return PTR_ERR(gpio);
+	if (IS_ERR(gpio)) {
+		ret = PTR_ERR(gpio);
+		goto fail_cleanup;
+	}
 	if (gpio) {
 		udelay(1);
 		gpiod_set_value_cansleep(gpio, 0);
@@ -516,7 +532,7 @@ static int pca954x_probe(struct i2c_client *client)
 
 		ret = i2c_get_device_id(client, &id);
 		if (ret && ret != -EOPNOTSUPP)
-			return ret;
+			goto fail_cleanup;
 
 		if (!ret &&
 		    (id.manufacturer_id != data->chip->id.manufacturer_id ||
@@ -524,7 +540,8 @@ static int pca954x_probe(struct i2c_client *client)
 			dev_warn(dev, "unexpected device id %03x-%03x-%x\n",
 				 id.manufacturer_id, id.part_id,
 				 id.die_revision);
-			return -ENODEV;
+			ret = -ENODEV;
+			goto fail_cleanup;
 		}
 	}
 
@@ -543,7 +560,8 @@ static int pca954x_probe(struct i2c_client *client)
 	ret = pca954x_init(client, data);
 	if (ret < 0) {
 		dev_warn(dev, "probe failed\n");
-		return -ENODEV;
+		ret = -ENODEV;
+		goto fail_cleanup;
 	}
 
 	ret = pca954x_irq_setup(muxc);
-- 
2.39.2