[PATCH 12/14] power: regulator: scmi: support SCMI multi-channel

[Jaehoon Chung]

On 5/13/22 15:26, Etienne Carriere wrote:
> Update SCMI regulator controller driver to get its assigned SCMI channel
> during initialization. This change allows SCMI voltage domain protocol
> to use a dedicated channel when defined in the DT. The reference is
> saved in SCMI regulator controller driver private data.
> 
> Cc: Jaehoon Chung <jh80.chung at samsung.com>
> Signed-off-by: Etienne Carriere <etienne.carriere at linaro.org>


Reviewed-by: Jaehoon Chung <jh80.chung at samsung.com>

Best Regards,
Jaehoon Chung

> ---
>  drivers/power/regulator/scmi_regulator.c | 20 +++++++++++++++-----
>  1 file changed, 15 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/power/regulator/scmi_regulator.c b/drivers/power/regulator/scmi_regulator.c
> index 3325ddaf23b..e0343e913f4 100644
> --- a/drivers/power/regulator/scmi_regulator.c
> +++ b/drivers/power/regulator/scmi_regulator.c
> @@ -27,6 +27,7 @@ struct scmi_regulator_platdata {
>  
>  static int scmi_voltd_set_enable(struct udevice *dev, bool enable)
>  {
> +	struct scmi_channel **scmi_channel_ref = dev_get_priv(dev);
>  	struct scmi_regulator_platdata *pdata = dev_get_plat(dev);
>  	struct scmi_voltd_config_set_in in = {
>  		.domain_id = pdata->domain_id,
> @@ -38,7 +39,7 @@ static int scmi_voltd_set_enable(struct udevice *dev, bool enable)
>  					  in, out);
>  	int ret;
>  
> -	ret = devm_scmi_process_msg(dev, NULL, &msg);
> +	ret = devm_scmi_process_msg(dev, *scmi_channel_ref, &msg);
>  	if (ret)
>  		return ret;
>  
> @@ -51,6 +52,7 @@ static int scmi_voltd_set_enable(struct udevice *dev, bool enable)
>  
>  static int scmi_voltd_get_enable(struct udevice *dev)
>  {
> +	struct scmi_channel **scmi_channel_ref = dev_get_priv(dev);
>  	struct scmi_regulator_platdata *pdata = dev_get_plat(dev);
>  	struct scmi_voltd_config_get_in in = {
>  		.domain_id = pdata->domain_id,
> @@ -61,7 +63,7 @@ static int scmi_voltd_get_enable(struct udevice *dev)
>  					  in, out);
>  	int ret;
>  
> -	ret = devm_scmi_process_msg(dev, NULL, &msg);
> +	ret = devm_scmi_process_msg(dev, *scmi_channel_ref, &msg);
>  	if (ret < 0)
>  		return ret;
>  
> @@ -74,6 +76,7 @@ static int scmi_voltd_get_enable(struct udevice *dev)
>  
>  static int scmi_voltd_set_voltage_level(struct udevice *dev, int uV)
>  {
> +	struct scmi_channel **scmi_channel_ref = dev_get_priv(dev);
>  	struct scmi_regulator_platdata *pdata = dev_get_plat(dev);
>  	struct scmi_voltd_level_set_in in = {
>  		.domain_id = pdata->domain_id,
> @@ -85,7 +88,7 @@ static int scmi_voltd_set_voltage_level(struct udevice *dev, int uV)
>  					  in, out);
>  	int ret;
>  
> -	ret = devm_scmi_process_msg(dev, NULL, &msg);
> +	ret = devm_scmi_process_msg(dev, *scmi_channel_ref, &msg);
>  	if (ret < 0)
>  		return ret;
>  
> @@ -94,6 +97,7 @@ static int scmi_voltd_set_voltage_level(struct udevice *dev, int uV)
>  
>  static int scmi_voltd_get_voltage_level(struct udevice *dev)
>  {
> +	struct scmi_channel **scmi_channel_ref = dev_get_priv(dev);
>  	struct scmi_regulator_platdata *pdata = dev_get_plat(dev);
>  	struct scmi_voltd_level_get_in in = {
>  		.domain_id = pdata->domain_id,
> @@ -104,7 +108,7 @@ static int scmi_voltd_get_voltage_level(struct udevice *dev)
>  					  in, out);
>  	int ret;
>  
> -	ret = devm_scmi_process_msg(dev, NULL, &msg);
> +	ret = devm_scmi_process_msg(dev, *scmi_channel_ref, &msg);
>  	if (ret < 0)
>  		return ret;
>  
> @@ -131,6 +135,7 @@ static int scmi_regulator_of_to_plat(struct udevice *dev)
>  
>  static int scmi_regulator_probe(struct udevice *dev)
>  {
> +	struct scmi_channel **scmi_channel_ref = dev_get_priv(dev);
>  	struct scmi_regulator_platdata *pdata = dev_get_plat(dev);
>  	struct scmi_voltd_attr_in in = { 0 };
>  	struct scmi_voltd_attr_out out = { 0 };
> @@ -144,10 +149,14 @@ static int scmi_regulator_probe(struct udevice *dev)
>  	};
>  	int ret;
>  
> +	ret = devm_scmi_of_get_channel(dev->parent, scmi_channel_ref);
> +	if (ret)
> +		return ret;
> +
>  	/* Check voltage domain is known from SCMI server */
>  	in.domain_id = pdata->domain_id;
>  
> -	ret = devm_scmi_process_msg(dev, NULL, &scmi_msg);
> +	ret = devm_scmi_process_msg(dev, *scmi_channel_ref, &scmi_msg);
>  	if (ret) {
>  		dev_err(dev, "Failed to query voltage domain %u: %d\n",
>  			pdata->domain_id, ret);
> @@ -171,6 +180,7 @@ U_BOOT_DRIVER(scmi_regulator) = {
>  	.probe = scmi_regulator_probe,
>  	.of_to_plat = scmi_regulator_of_to_plat,
>  	.plat_auto = sizeof(struct scmi_regulator_platdata),
> +	.priv_auto = sizeof(struct scmi_channel *),
>  };
>  
>  static int scmi_regulator_bind(struct udevice *dev)