[PATCH v10 3/3] i2c: muxes: pca954x: Add regulator support

Patrick Rudolph
2023-03-23T11:54:36Z

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

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
---
drivers/i2c/muxes/i2c-mux-pca954x.c | 35 ++++++++++++++++++++++++-----
1 file changed, 30 insertions(+), 5 deletions(-)

diff --git a/drivers/i2c/muxes/i2c-mux-pca954x.c b/drivers/i2c/muxes/i2c-mux-pca954x.c
index 39f313658b18..0d966a55b727 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 */
@@ -440,6 +442,9 @@ static void pca954x_cleanup(struct i2c_mux_core *muxc)
struct pca954x *data = i2c_mux_priv(muxc);
int c, irq;

+ if (data->supply)
+ regulator_disable(data->supply);
+
if (data->irq) {
for (c = 0; c < data->chip->nchans; c++) {
irq = irq_find_mapping(data->irq, c);
@@ -492,10 +497,28 @@ static int pca954x_probe(struct i2c_client *client)
i2c_set_clientdata(client, muxc);
data->client = client;

+ data->supply = devm_regulator_get_optional(dev, "vdd");
+ if (IS_ERR(data->supply)) {
+ ret = PTR_ERR(data->supply);
+ if (ret != -ENODEV)
+ return dev_err_probe(dev, ret,
+ "Failed to request regulator\n");
+ else
+ data->supply = NULL;
+ } else {
+ ret = regulator_enable(data->supply);
+ if (ret) {
+ dev_err(dev, "Failed to enable regulator: %d\n", ret);
+ return ret;
+ }
+ }
+
/* 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);
@@ -512,7 +535,7 @@ 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 ||
@@ -520,7 +543,8 @@ 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;
}
}

@@ -539,7 +563,8 @@ 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);
--
2.39.1