On Thu, Aug 28, 2014 at 01:59:15PM +0100, Mark Rutland wrote: > On Thu, Aug 28, 2014 at 01:42:44PM +0100, Matti Vaittinen wrote: > > Patch adding support for specifying trickle charger setup from device > > tree. Patch is based on linux-next tree. > > > > > > Some DS13XX devices have "trickle chargers". Introduce a device tree binding > > for specifying the setup and register values. > > > > Signed-off-by: Matti Vaittinen <matti.vaittinen@xxxxxxx> > > --- > > .../devicetree/bindings/i2c/trivial-devices.txt | 1 - > > .../devicetree/bindings/rtc/dallas,ds1339.txt | 19 ++++++++++ > > drivers/rtc/rtc-ds1307.c | 44 ++++++++++++++++++++-- > > 3 files changed, 59 insertions(+), 5 deletions(-) > > create mode 100644 Documentation/devicetree/bindings/rtc/dallas,ds1339.txt > > > > diff --git a/Documentation/devicetree/bindings/i2c/trivial-devices.txt b/Documentation/devicetree/bindings/i2c/trivial-devices.txt > > index 6af570e..e9206a4 100644 > > --- a/Documentation/devicetree/bindings/i2c/trivial-devices.txt > > +++ b/Documentation/devicetree/bindings/i2c/trivial-devices.txt > > @@ -35,7 +35,6 @@ catalyst,24c32 i2c serial eeprom > > cirrus,cs42l51 Cirrus Logic CS42L51 audio codec > > dallas,ds1307 64 x 8, Serial, I2C Real-Time Clock > > dallas,ds1338 I2C RTC with 56-Byte NV RAM > > -dallas,ds1339 I2C Serial Real-Time Clock > > dallas,ds1340 I2C RTC with Trickle Charger > > dallas,ds1374 I2C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output > > dallas,ds1631 High-Precision Digital Thermometer > > diff --git a/Documentation/devicetree/bindings/rtc/dallas,ds1339.txt b/Documentation/devicetree/bindings/rtc/dallas,ds1339.txt > > new file mode 100644 > > index 0000000..9faf40e > > --- /dev/null > > +++ b/Documentation/devicetree/bindings/rtc/dallas,ds1339.txt > > @@ -0,0 +1,19 @@ > > +* Dallas DS1339 I2C Serial Real-Time Clock > > + > > +Required properties: > > +- compatible: Should contain "dallas,ds1339". > > +- reg: I2C address for chip > > + > > +Optional properties: > > +- trickle_setup : Used Trickle Charger configuration, > > + corresponding to 5 lowest bits in trickle charger register. > The value is provided via platform data, so it is platform specific and presumably needs to be configurable. I did, however, not find a single in-kernel driver which is actually setting it. So this is a good question. > s/_/-/ in property names please. > > What do these bits do? is there any documentation available? > > Why do they need to be in the DT? > > Why do we not have a higher-level description? > > > +- trickle_reg : Trickle charger register address. Defaults to 0x10 for ds1339. > > Is this expected to change? Why does this need to be in the DT? > A quick look into the code suggests that this is a chip specific register, and the register address is set by the driver depending on the chip type. I don't think it should be configurable via dt. Guenter -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
