[PATCH v1 3/3] drm/bridge: lt8912b: Add power supplies

[Francesco Dolcini]

From: Stefan Eichenberger <stefan.eichenber...@toradex.com>

Add supplies to the driver that can be used to turn the Lontium lt8912b
on and off. It can have up to 7 independent supplies, we add them all
and enable/disable them with bulk_enable/disable.

Signed-off-by: Stefan Eichenberger <stefan.eichenber...@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolc...@toradex.com>
---
 drivers/gpu/drm/bridge/lontium-lt8912b.c | 30 ++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/gpu/drm/bridge/lontium-lt8912b.c 
b/drivers/gpu/drm/bridge/lontium-lt8912b.c
index 097ab04234b7..273157428c82 100644
--- a/drivers/gpu/drm/bridge/lontium-lt8912b.c
+++ b/drivers/gpu/drm/bridge/lontium-lt8912b.c
@@ -43,6 +43,8 @@ struct lt8912 {
 
        struct videomode mode;
 
+       struct regulator_bulk_data supplies[7];
+
        u8 data_lanes;
        bool is_power_on;
 };
@@ -257,6 +259,12 @@ static int lt8912_free_i2c(struct lt8912 *lt)
 
 static int lt8912_hard_power_on(struct lt8912 *lt)
 {
+       int ret;
+
+       ret = regulator_bulk_enable(ARRAY_SIZE(lt->supplies), lt->supplies);
+       if (ret)
+               return ret;
+
        gpiod_set_value_cansleep(lt->gp_reset, 0);
        msleep(20);
 
@@ -267,6 +275,9 @@ static void lt8912_hard_power_off(struct lt8912 *lt)
 {
        gpiod_set_value_cansleep(lt->gp_reset, 1);
        msleep(20);
+
+       regulator_bulk_disable(ARRAY_SIZE(lt->supplies), lt->supplies);
+
        lt->is_power_on = false;
 }
 
@@ -661,6 +672,21 @@ static int lt8912_bridge_suspend(struct device *dev)
 
 static DEFINE_SIMPLE_DEV_PM_OPS(lt8912_bridge_pm_ops, lt8912_bridge_suspend, 
lt8912_bridge_resume);
 
+static int lt8912_get_regulators(struct lt8912 *lt)
+{
+       unsigned int i;
+       const char * const supply_names[] = {
+               "vdd", "vccmipirx", "vccsysclk", "vcclvdstx",
+               "vcchdmitx", "vcclvdspll", "vcchdmipll"
+       };
+
+       for (i = 0; i < ARRAY_SIZE(lt->supplies); i++)
+               lt->supplies[i].supply = supply_names[i];
+
+       return devm_regulator_bulk_get(lt->dev, ARRAY_SIZE(lt->supplies),
+                                      lt->supplies);
+}
+
 static int lt8912_parse_dt(struct lt8912 *lt)
 {
        struct gpio_desc *gp_reset;
@@ -712,6 +738,10 @@ static int lt8912_parse_dt(struct lt8912 *lt)
                goto err_free_host_node;
        }
 
+       ret = lt8912_get_regulators(lt);
+       if (ret)
+               goto err_free_host_node;
+
        of_node_put(port_node);
        return 0;
 
-- 
2.25.1