[PATCH] regulator: sgm3804: register rails with their DT nodes

[PATCH] regulator: sgm3804: register rails with their DT nodes

[kr494167]

From: surendra <kr494167@gmail.com>

The driver locates the pos and neg child nodes to obtain their enable
GPIOs, but registers both regulators with the parent node. As a result,
the regulator core does not parse per-rail DT constraints or supplies.

Pass each matching child node in regulator_config.of_node.

Fixes: 0c47e1a8cf5d ("regulator: add SGM3804 Dual Output driver")
Signed-off-by: surendra <kr494167@gmail.com>
---
 drivers/regulator/sgm3804-regulator.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/regulator/sgm3804-regulator.c b/drivers/regulator/sgm3804-regulator.c
index c3406cfb73d0..531b98460ee3 100644
--- a/drivers/regulator/sgm3804-regulator.c
+++ b/drivers/regulator/sgm3804-regulator.c
@@ -9,6 +9,7 @@
 #include <linux/err.h>
 #include <linux/i2c.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/regmap.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/of_regulator.h>
@@ -268,14 +269,21 @@ static int sgm3804_probe(struct i2c_client *i2c)
 
 	for (i = 0; i < ARRAY_SIZE(sgm3804_regulator_desc); i++) {
 		struct regulator_config config = { };
+		const struct regulator_desc *reg = &sgm3804_regulator_desc[i];
 		struct regulator_dev *rdev;
+		struct device_node *child;
+
+		child = of_get_child_by_name(dev_of_node(dev), reg->of_match);
+		if (!child)
+			return dev_err_probe(dev, -EINVAL, "missing child '%s'\n",
+					     reg->of_match);
 
 		config.dev = dev;
 		config.regmap = ctx->regmap;
-		config.of_node = dev_of_node(dev);
+		config.of_node = child;
 		config.driver_data = ctx;
-		rdev = devm_regulator_register(dev, &sgm3804_regulator_desc[i],
-					       &config);
+		rdev = devm_regulator_register(dev, reg, &config);
+		of_node_put(child);
 		if (IS_ERR(rdev))
 			return dev_err_probe(dev, PTR_ERR(rdev),
 					     "failed to register regulator %d\n", i);
-- 
2.55.0

Re: [PATCH] regulator: sgm3804: register rails with their DT nodes

[neil.armstrong]

On 7/20/26 12:59, kr494167@gmail.com wrote:
> From: surendra <kr494167@gmail.com>
> 
> The driver locates the pos and neg child nodes to obtain their enable
> GPIOs, but registers both regulators with the parent node. As a result,
> the regulator core does not parse per-rail DT constraints or supplies.

Hmmm, no it does get the constraints properly because the regulator core will
fetch the associated subnodes with the of_match desc property in regulator_of_get_init_node().

This patch solves nothing and duplicates the regulator core behaviour.

Neil

> 
> Pass each matching child node in regulator_config.of_node.
> 
> Fixes: 0c47e1a8cf5d ("regulator: add SGM3804 Dual Output driver")
> Signed-off-by: surendra <kr494167@gmail.com>
> ---
>   drivers/regulator/sgm3804-regulator.c | 14 +++++++++++---
>   1 file changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/regulator/sgm3804-regulator.c b/drivers/regulator/sgm3804-regulator.c
> index c3406cfb73d0..531b98460ee3 100644
> --- a/drivers/regulator/sgm3804-regulator.c
> +++ b/drivers/regulator/sgm3804-regulator.c
> @@ -9,6 +9,7 @@
>   #include <linux/err.h>
>   #include <linux/i2c.h>
>   #include <linux/module.h>
> +#include <linux/of.h>
>   #include <linux/regmap.h>
>   #include <linux/regulator/driver.h>
>   #include <linux/regulator/of_regulator.h>
> @@ -268,14 +269,21 @@ static int sgm3804_probe(struct i2c_client *i2c)
>   
>   	for (i = 0; i < ARRAY_SIZE(sgm3804_regulator_desc); i++) {
>   		struct regulator_config config = { };
> +		const struct regulator_desc *reg = &sgm3804_regulator_desc[i];
>   		struct regulator_dev *rdev;
> +		struct device_node *child;
> +
> +		child = of_get_child_by_name(dev_of_node(dev), reg->of_match);
> +		if (!child)
> +			return dev_err_probe(dev, -EINVAL, "missing child '%s'\n",
> +					     reg->of_match);
>   
>   		config.dev = dev;
>   		config.regmap = ctx->regmap;
> -		config.of_node = dev_of_node(dev);
> +		config.of_node = child;
>   		config.driver_data = ctx;
> -		rdev = devm_regulator_register(dev, &sgm3804_regulator_desc[i],
> -					       &config);
> +		rdev = devm_regulator_register(dev, reg, &config);
> +		of_node_put(child);
>   		if (IS_ERR(rdev))
>   			return dev_err_probe(dev, PTR_ERR(rdev),
>   					     "failed to register regulator %d\n", i);