On Tue, May 19, 2020 at 02:43:52PM +0200, Jonathan Albrieux wrote: > Add reset-gpio support. > > Without reset's deassertion during ak8975_power_on(), driver's probe fails > on ak8975_who_i_am() while checking for device identity for AK09911 chip. > > AK09911 has an active low reset gpio to handle register's reset. > AK09911 datasheed says that, if not used, reset pin should be connected datasheed -> datasheet > to VID. This patch emulates this situation. > > Signed-off-by: Jonathan Albrieux <jonathan.albrieux@xxxxxxxxx> > --- > .../devicetree/bindings/iio/magnetometer/ak8975.yaml | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/Documentation/devicetree/bindings/iio/magnetometer/ak8975.yaml b/Documentation/devicetree/bindings/iio/magnetometer/ak8975.yaml > index 86e3efa693a8..a82c0ff5d098 100644 > --- a/Documentation/devicetree/bindings/iio/magnetometer/ak8975.yaml > +++ b/Documentation/devicetree/bindings/iio/magnetometer/ak8975.yaml > @@ -37,6 +37,9 @@ properties: > mount-matrix: > description: an optional 3x3 mounting rotation matrix > > + reset-gpio: > + description: an optional pin needed for AK09911 to set the reset state Maybe add a comment that this should be "usually active low". > + > required: > - compatible > - reg > @@ -53,6 +56,7 @@ examples: > reg = <0x0c>; > gpios = <&gpj0 7 0>; > vdd-supply = <&ldo_3v3_gnss>; > + reset-gpio = <&msmgpio 111 1>; Same here, reset-gpio = <&msmgpio 111 GPIO_ACTIVE_LOW>, would be more clear. > mount-matrix = "-0.984807753012208", /* x0 */ > "0", /* y0 */ > "-0.173648177666930", /* z0 */ > -- > 2.17.1
