* Stephen Warren <[email protected]> [130403 09:49]: > On 04/03/2013 03:16 AM, Prabhakar Lad wrote: > > Hi Linus/Stephen, > > > > I am working adding DT nodes for DA850. > > > > Following is the pin control snippet of da850.dtsi:- > > > > pmx_core: pinmux@1c14120 { > ... > > i2c0_pins: pinmux_i2c0_pins { > > pinctrl-single,bits = < > > /* I2C0_SDA,I2C0_SCL */ > > 0x10 0x00002200 0x0000ff00 > > >; > > }; > > mdio_pins: pinmux_mdio_pins { > > pinctrl-single,bits = < > > /* MDIO_CLK, MDIO_D */ > > 0x10 0x00000088 0x000000ff > > >; > > }; > > } > > > > And following is the code snippet for dts:- > > > > i2c0: i2c@1c22000 { > > status = "okay"; > > clock-frequency = <100000>; > > pinctrl-names = "default"; > > pinctrl-0 = <&i2c0_pins>; > > }; > > mdio: mdio@1e24000 { > > status = "okay"; > > bus_freq = <2200000>; > > pinctrl-names = "default"; > > I assume there's also the following there: > > pinctrl-0 = <&mdio_pins>; > > > }; > > > > But while booting I see the following boot log:- > > ... > > cpuidle: using governor menu > > TCP: cubic registered > > NET: Registered protocol family 17 > > pinctrl-single 1c14120.pinmux: pin 1c14130 already requested by > > davinci_mdio.0; cannot claim for i2c_davinci.1 > > pinctrl-single 1c14120.pinmux: pin-4 (i2c_davinci.1) status -22 > > pinctrl-single 1c14120.pinmux: could not request pin 4 on device > > pinctrl-single > > console [netcon0] enabled > > .... > > > > This is because the mdio and i2c are using same pin 0x10, > > How can two devices use the same pin? I mean physically, in hardware? > > Is this because pinctrl-single uses the register address as the pin > number, whereas you have registers which configure multiple pins at > once? If so, your hardware isn't something that can be represented by > pinctrl-single. > > > Is there any > > alternative way to handle if the two node's are using same pins any > > pointers could be very much helpful ?
It could also that the mux register(s) follow the one-mux-per-bit mapping. In that case pinctrl-single,bits option as documented in the Documentation/devicetree/bindings/pinctrl/pinctrl-single.txt. Regards, Tony _______________________________________________ devicetree-discuss mailing list [email protected] https://lists.ozlabs.org/listinfo/devicetree-discuss
