Hi Bibby, On Mon, Oct 28, 2019 at 11:36 AM Bibby Hsieh <bibby.hsieh@xxxxxxxxxxxx> wrote: > > On Sat, 2019-10-26 at 14:05 +0200, Bartosz Golaszewski wrote: > > pt., 25 paź 2019 o 23:10 Rob Herring <robh@xxxxxxxxxx> napisał(a): > > > > > > On Thu, Oct 24, 2019 at 06:32:38PM +0900, Tomasz Figa wrote: > > > > On Thu, Oct 24, 2019 at 5:40 PM Bartosz Golaszewski > > > > <bgolaszewski@xxxxxxxxxxxx> wrote: > > > > > > > > > > czw., 24 paź 2019 o 09:02 Tomasz Figa <tfiga@xxxxxxxxxxxx> napisał(a): > > > > > > > > > > > > On Thu, Oct 24, 2019 at 3:22 PM Bartosz Golaszewski > > > > > > <bgolaszewski@xxxxxxxxxxxx> wrote: > > > > > > > > > > > > > > pt., 18 paź 2019 o 10:26 Bibby Hsieh <bibby.hsieh@xxxxxxxxxxxx> napisał(a): > > > > > > > > > > > > > > > > In some platforms, they disable the power-supply of eeprom and i2c due > > > > > > > > to power consumption reduction. > > > > > > > > > > > > > > > > This patch add two supply properties: vcc-supply, i2c-supply. > > > > > > > > > > > > > > > > Changes since v1: > > > > > > > > - change supply name > > > > > > > > - rebase to next > > > > > > > > > > > > > > > > Signed-off-by: Bibby Hsieh <bibby.hsieh@xxxxxxxxxxxx> > > > > > > > > --- > > > > > > > > Documentation/devicetree/bindings/eeprom/at24.yaml | 8 ++++++++ > > > > > > > > 1 file changed, 8 insertions(+) > > > > > > > > > > > > > > > > diff --git a/Documentation/devicetree/bindings/eeprom/at24.yaml b/Documentation/devicetree/bindings/eeprom/at24.yaml > > > > > > > > index e8778560d966..578487a5d9b7 100644 > > > > > > > > --- a/Documentation/devicetree/bindings/eeprom/at24.yaml > > > > > > > > +++ b/Documentation/devicetree/bindings/eeprom/at24.yaml > > > > > > > > @@ -167,6 +167,14 @@ properties: > > > > > > > > minimum: 1 > > > > > > > > maximum: 8 > > > > > > > > > > > > > > > > + vcc-supply: > > > > > > > > + description: > > > > > > > > + phandle of the regulator that provides the supply voltage. > > > > > > > > + > > > > > > > > + i2c-sypply: > > > > > > > > + description: > > > > > > > > + phandle to the regulator that provides power to i2c. > > > > > > > > + > > > > > > > > > > > > > > Something was bothering me about this patch so I came back to take a > > > > > > > look. Can you explain what i2c actually stands for in this doc? I hope > > > > > > > I'm misinterpreting something and it isn't that the driver disables > > > > > > > the regulator powering the i2c bus controller? > > > > > > > > > > > > In our case it's the regulator that the I2C bus is pulled up to. > > > > > > > > > > > > > > > > Then it has nothing to do with a generic EEPROM driver IMO. I think > > > > > you need to add the control for this regulator to your i2c controller > > > > > driver and create a power domain where the EEPROM would be lower in > > > > > hierarchy. > > > > > > > > While I agree that the generic EEPROM driver may not be the best place > > > > to do it, neither is a driver for a specific SoC i2c controller. The > > > > hardware design is not specific to any particular i2c controller. > > > > > > > > Perhaps we need the generic i2c core to take into account an > > > > i2c-supply? Wolfram, any thoughts on this? > > > > > > Sounds good to me. Maybe 'bus-supply' instead to indicate it's supposed > > > to be for the bus and not other things. It should reside in the I2C > > > controller's node (or mux ports) though. > > > > > > Rob > > > > Thanks, > > > > in that case Bibby: please just use a single regulator for vcc-supply in at24. > > To my understanding, there are something I need to do. > 1. remove i2c-supply property from DT. > 2. just control vcc-supply in at24 driver. > 3. add i2c-supply control in i2c and i2c-supply property in DT? > > Is there any mistakes? Sorry for the late reply, just came back from a trip. With the replacement of i2c-supply to bus-supply in 3), as suggested by Rob, sounds good to me. Best regards, Tomasz
