[PATCH 1/3] misc: eeprom: at24: add optional dovdd-supply

zoie.lin
2024-04-26T10:30:48Z

From: Zoie Lin <zoie.lin@mediatek.com>

Incorporate support for the dovdd regulator, which supplies an
additional power source to the EEPROM.

Signed-off-by: Zoie Lin <zoie.lin@mediatek.com>
---
drivers/misc/eeprom/at24.c | 37 +++++++++++++++++++++++++++++++++++--
1 file changed, 35 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
index 572333ead5fb..b96f6eda3ad2 100644
--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -86,6 +86,7 @@ struct at24_data {

struct nvmem_device *nvmem;
struct regulator *vcc_reg;
+ struct regulator *dovdd_reg;
void (*read_post)(unsigned int off, char *buf, size_t count);

/*
@@ -697,6 +698,14 @@ static int at24_probe(struct i2c_client *client)
if (IS_ERR(at24->vcc_reg))
return PTR_ERR(at24->vcc_reg);

+ at24->dovdd_reg = devm_regulator_get_optional(dev, "dovdd");
+ if (IS_ERR(at24->dovdd_reg)) {
+ if (PTR_ERR(at24->dovdd_reg) == -ENODEV)
+ at24->dovdd_reg = NULL;
+ else
+ return PTR_ERR(at24->dovdd_reg);
+ }
+
writable = !(flags & AT24_FLAG_READONLY);
if (writable) {
at24->write_max = min_t(unsigned int,
@@ -754,6 +763,14 @@ static int at24_probe(struct i2c_client *client)
return err;
}

+ if (at24->dovdd_reg != NULL) {
+ err = regulator_enable(at24->dovdd_reg);
+ if (err) {
+ dev_err(dev, "Failed to enable dovdd regulator\n");
+ return err;
+ }
+ }
+
pm_runtime_set_active(dev);
}
pm_runtime_enable(dev);
@@ -761,8 +778,11 @@ static int at24_probe(struct i2c_client *client)
at24->nvmem = devm_nvmem_register(dev, &nvmem_config);
if (IS_ERR(at24->nvmem)) {
pm_runtime_disable(dev);
- if (!pm_runtime_status_suspended(dev))
+ if (!pm_runtime_status_suspended(dev)) {
regulator_disable(at24->vcc_reg);
+ if (at24->dovdd_reg != NULL)
+ regulator_disable(at24->dovdd_reg);
+ }
return dev_err_probe(dev, PTR_ERR(at24->nvmem),
"failed to register nvmem\n");
}
@@ -804,8 +824,11 @@ static void at24_remove(struct i2c_client *client)

pm_runtime_disable(&client->dev);
if (acpi_dev_state_d0(&client->dev)) {
- if (!pm_runtime_status_suspended(&client->dev))
+ if (!pm_runtime_status_suspended(&client->dev)) {
regulator_disable(at24->vcc_reg);
+ if (at24->dovdd_reg != NULL)
+ regulator_disable(at24->dovdd_reg);
+ }
pm_runtime_set_suspended(&client->dev);
}
}
@@ -815,14 +838,24 @@ static int __maybe_unused at24_suspend(struct device *dev)
struct i2c_client *client = to_i2c_client(dev);
struct at24_data *at24 = i2c_get_clientdata(client);

+ if (at24->dovdd_reg != NULL)
+ regulator_disable(at24->dovdd_reg);
+
return regulator_disable(at24->vcc_reg);
}

static int __maybe_unused at24_resume(struct device *dev)
{
+ int err;
struct i2c_client *client = to_i2c_client(dev);
struct at24_data *at24 = i2c_get_clientdata(client);

+ if (at24->dovdd_reg != NULL) {
+ err = regulator_enable(at24->dovdd_reg);
+ if (err)
+ return err;
+ }
+
return regulator_enable(at24->vcc_reg);
}

--
2.18.0