On Fri, 27 Jan 2017, Peter Rosin wrote: comments below, picking on typos > On 2017-01-27 20:50, Rob Herring wrote: > > On Wed, Jan 18, 2017 at 04:57:12PM +0100, Peter Rosin wrote: > >> Analog Devices ADG792A/G is a triple 4:1 mux. > >> > >> Acked-by: Jonathan Cameron <jic23@xxxxxxxxxx> > >> Signed-off-by: Peter Rosin <peda@xxxxxxxxxx> > >> --- > >> .../devicetree/bindings/mux/mux-adg792a.txt | 79 ++++++++++++++++++++++ > >> 1 file changed, 79 insertions(+) > >> create mode 100644 Documentation/devicetree/bindings/mux/mux-adg792a.txt > >> > >> diff --git a/Documentation/devicetree/bindings/mux/mux-adg792a.txt b/Documentation/devicetree/bindings/mux/mux-adg792a.txt > >> new file mode 100644 > >> index 000000000000..0b26dd11f070 > >> --- /dev/null > >> +++ b/Documentation/devicetree/bindings/mux/mux-adg792a.txt > >> @@ -0,0 +1,79 @@ > >> +Bindings for Analog Devices ADG792A/G Triple 4:1 Multiplexers > >> + > >> +Required properties: > >> +- compatible : "adi,adg792a" or "adi,adg792g" > >> +- #mux-control-cells : <0> if parallel, or <1> if not. > >> +* Standard mux-controller bindings as decribed in mux-controller.txt described > >> + > >> +Optional properties for ADG792G: > >> +- gpio-controller : if present, #gpio-cells below is required. > >> +- #gpio-cells : should be <2> > >> + - First cell is the GPO line number, i.e. 0 or 1 > >> + - Second cell is used to specify active high (0) > >> + or active low (1) > >> + > >> +Optional properties: > >> +- adi,parallel : if present, the three muxes are bound together with a single > >> + mux controller, controlling all three muxes in parallel. > > > > Can't this be implied by #mux-control-cells == 0? > > Right, good point! I'll drop adi,parallel. > > >> +- adi,idle-state : if present, array of 2-tuples with mux controller number > >> + and state that mux controllers will have when idle. States 0 through 3 > >> + correspond to signals A through D in the datasheet. > >> +- adi,idle-high-impedance : if present, array of mux controller numbers that > >> + should be in the disconnected high-impedance state when idle. > > > > Perhaps combine these 2 to a common idle-state with the index being the > > mux controller number and a value of -1 (or 4) being hi-Z. > > At one point [1] I had a straight array for the mux controllers with state 4 > being hi-Z and state 5 being the default "leave mux as-is on release", but > Jonathan didn't like magic numbers. Can you please read the follow-ups to the > referenced mail for some background, and then pick out the most suitable color > for me to paint with? :-) > > [1] https://lkml.org/lkml/2016/11/30/110 > > >> + > >> +Mux controller states 0 through 3 correspond to signals A through D in the > >> +datasheet. If a mux controller is mentioned in neither adi,idle-state nor that is already being said under 'adi,idle-state' > >> +adi,idle-high-impedance it is left in its previously selected state when idle. > >> + > >> +Example: > >> + > >> + /* > >> + * Three independent mux controllers (of which one is used). > >> + * Mux 0 is disconnected when idle, mux 1 idles with signal C > >> + * and mux 2 idles with signal A. > >> + */ > >> + &i2c0 { > >> + mux: adg792a@50 { > > > > mux-controller@50 > > Yep. Hmm, where have I seen that before? :-) > > Cheers, > peda > > >> + compatible = "adi,adg792a"; > >> + reg = <0x50>; > >> + #mux-control-cells = <1>; > >> + > >> + adi,idle-high-impedance = <0>; > >> + adi,idle-state = <1 2>, <2 0>; > >> + }; > >> + }; > >> + > >> + adc-mux { > >> + compatible = "io-channel-mux"; > >> + io-channels = <&adc 0>; > >> + io-channel-names = "parent"; > >> + > >> + mux-controls = <&mux 1>; > >> + > >> + channels = "sync-1", "", "out"; > >> + }; > >> + > >> + > >> + /* > >> + * Three parallel muxes with one mux controller, useful e.g. if > >> + * the adc is differential, thus needing two signals to be muxed > >> + * simultaneously for correct operation. > >> + */ > >> + &i2c0 { > >> + pmux: adg792a@50 { > >> + compatible = "adi,adg792a"; > >> + reg = <0x50>; > >> + #mux-control-cells = <0>; > >> + adi,parallel; > >> + }; > >> + }; > >> + > >> + diff-adc-mux { > >> + compatible = "io-channel-mux"; > >> + io-channels = <&adc 0>; > >> + io-channel-names = "parent"; > >> + > >> + mux-controls = <&pmux>; > >> + > >> + channels = "sync-1", "", "out"; > >> + }; > >> -- > >> 2.1.4 > >> > >> -- > >> 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 > -- Peter Meerwald-Stadler +43-664-2444418 (mobile) -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
