On Fri, 18 Nov 2022, at 5:05 AM, Lin, Meng-Bo wrote: > The Samsung touchscreen controllers are often used with external pull-up > for the interrupt line and the I2C lines, so we might need to enable > a regulator to bring the lines into usable state. Otherwise, this might > cause spurious interrupts and reading from I2C will fail. > > Document support for a "vddio-supply" that is enabled by the cyttsp5 > driver so that the regulator gets enabled when needed. > > Signed-off-by: Lin, Meng-Bo <linmengbo0689@xxxxxxxxxxxxxx> Reviewed-by: Alistair Francis <alistair@xxxxxxxxxxxxx> > --- > .../devicetree/bindings/input/touchscreen/cypress,tt21000.yaml | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml b/Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml > index 1959ec394768..869a9bdd962f 100644 > --- a/Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml > +++ b/Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml > @@ -34,6 +34,9 @@ properties: > vdd-supply: > description: Regulator for voltage. > > + vddio-supply: > + description: Optional Regulator for I/O voltage. > + > reset-gpios: > maxItems: 1 > > -- > 2.30.2 > > >
