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

[Etienne Carriere]

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.ch...@samsung.com>
Signed-off-by: Etienne Carriere <etienne.carri...@linaro.org>
---
 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)
-- 
2.25.1