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Use devm_regulator_get() to obtain the vcc supply and enable it at the start of probe. devm_regulator_get() returns a dummy regulator when the supply is not described in the device tree, so device trees without a vcc-supply property keep working as before. Signed-off-by: Shashank Maurya --- drivers/regulator/rpi-panel-v2-regulator.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/regulator/rpi-panel-v2-regulator.c b/drivers/regulator/rpi-panel-v2-regulator.c index 30b78aa75ee3..e54d675962e7 100644 --- a/drivers/regulator/rpi-panel-v2-regulator.c +++ b/drivers/regulator/rpi-panel-v2-regulator.c @@ -11,6 +11,7 @@ #include #include #include +#include /* I2C registers of the microcontroller. */ #define REG_ID 0x01 @@ -66,10 +67,21 @@ static int rpi_panel_v2_i2c_probe(struct i2c_client *i2c) .parent = &i2c->dev, .reg_set_base = REG_POWERON, }; + struct regulator *vcc; struct regmap *regmap; struct pwm_chip *pc; int ret; + vcc = devm_regulator_get(&i2c->dev, "vcc"); + if (IS_ERR(vcc)) + return dev_err_probe(&i2c->dev, PTR_ERR(vcc), + "Failed to get vcc supply\n"); + + ret = regulator_enable(vcc); + if (ret) + return dev_err_probe(&i2c->dev, ret, + "Failed to enable vcc supply\n"); + pc = devm_pwmchip_alloc(&i2c->dev, 1, 0); if (IS_ERR(pc)) return PTR_ERR(pc); -- 2.34.1