On Fri, Feb 12, 2016 at 11:15 AM, Robert Nelson <[email protected]> wrote: > On Fri, Feb 12, 2016 at 11:11 AM, Rafael Vega <[email protected]> wrote: >> Hi. >> >> I have the following DTO that I've been using successfully in kernel 3.8 to >> use pin P9_41 as an input: >> >> ... >> P9_41A_i: P9_41A_in{pinctrl-single,pins = <0x1B4 0x37>;}; >> P9_41A_o: P9_41A_out{pinctrl-single,pins = <0x1B4 0x0F 0x1A8 >> 0x37>;}; >> ... >> P9_41A_mux { >> compatible = "bone-pinmux-helper"; >> status = "okay"; >> pinctrl-names = "input", "output"; >> pinctrl-0 = <&P9_41A_i>; >> pinctrl-1 = <&P9_41A_o>; >> }; >> >> >> After compiling and loading the DTO in kernel 3.8, the >> /sys/devices/ocp.4/P9_41_mux/status file is created and if I echo "input" >> into it, I can read the pin as an input. However, in kernel 4.1, the >> /sys/devices/platform/ocp/P9_41_mux/status file is created but when I echo >> "input" to it, nothing happens and I can't read the value of the pin. >> >> What am I missing? What else do I need to use to enable P9_42 as an input? > > P9_41 is used by audio, so make sure you are using the > *-nhdmi-overlay.dtb, *-emmc-overlay.dtb or *-overlay.dtb
ah p9_41.. so on mainline it's setup as clkout2_pin: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/arch/arm/boot/dts/am335x-bone-common.dtsi#n98 I left it enabled for our 4.1.x branch: https://github.com/beagleboard/linux/blob/4.1/arch/arm/boot/dts/am335x-bone-common.dtsi#L98-L102 It was first introduced here: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/arch/arm/boot/dts/am335x-bone-common.dtsi?id=2ba3549352277514a8e4790adff77a783ee1b9e2 anyone have a hint/reason why it should/shouldn't be enabled by default.. Regards, -- Robert Nelson https://rcn-ee.com/ -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
