The sysfs device link can only be created after regulator device
registered.
Otherwise, the regulator always have some warning logs.
...
[ 1.033024] DCDC_REG1: supplied by vcc5v0_sys
[ 1.033427] vcc5v0_sys: could not add device link regulator.3 err -2
[ 1.034302] vdd_center: 750 <--> 1350 mV at 900 mV
[ 1.034862] rk808 0-0020: Looking up vcc2-supply from device tree
[ 1.034907] DCDC_REG2: supplied by vcc5v0_sys
[ 1.035298] vcc5v0_sys: could not add device link regulator.4 err -2
[ 1.036301] vdd_cpu_l: 750 <--> 1350 mV at 900 mV
[ 1.036837] rk808 0-0020: Looking up vcc3-supply from device tree
[ 1.036880] DCDC_REG3: supplied by vcc5v0_sys
[ 1.037271] vcc5v0_sys: could not add device link regulator.5 err -2
[ 1.037985] vcc_ddr: at 500 mV
[ 1.038508] rk808 0-0020: Looking up vcc4-supply from device tree
[ 1.038550] DCDC_REG4: supplied by vcc5v0_sys
[ 1.038941] vcc5v0_sys: could not add device link regulator.6 err -2
[ 1.039657] vcc3v3_sys: 3300 mV
[ 1.040179] rk808 0-0020: Looking up vcc9-supply from device tree
[ 1.040223] DCDC_REG5: supplied by vcc5v0_sys
Fixes: c438b9d017 ("regulator: core: Move registration of regulator device")
Change-Id: Ie20421eab45f3f8229a5bedf3fecf99c757160bb
Signed-off-by: Caesar Wang <wxt@rock-chips.com>
bccbbdfc35