linux-kernel - Re: [PATCH v2] ARM: dts: am335x-bone-common: Add i2c2 definition

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Date:	Mon, 12 May 2014 13:15:17 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Robert Nelson <robertcnelson@...il.com>
Cc:	Matt Ranostay <mranostay@...il.com>, robh+dt@...nel.org,
	mark.rutland@....com, Russell King <linux@....linux.org.uk>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	devicetree <devicetree@...r.kernel.org>,
	linux kernel <linux-kernel@...r.kernel.org>,
	pantelis.antoniou@...il.com, matt.porter@...aro.org
Subject: Re: [PATCH v2] ARM: dts: am335x-bone-common: Add i2c2 definition

* Robert Nelson <robertcnelson@...il.com> [140512 13:00]:
> >>
> >> +     i2c2_pins: pinmux_i2c2_pins {
> >> +             pinctrl-single,pins = <
> >> +                     0x178 (PIN_INPUT_PULLUP | MUX_MODE3)    /* uart1_ctsn.i2c2_sda */
> >> +                     0x17c (PIN_INPUT_PULLUP | MUX_MODE3)    /* uart1_rtsn.i2c2_scl */
> >> +             >;
> >> +     };
> >> +
> >>       uart0_pins: pinmux_uart0_pins {
> >>               pinctrl-single,pins = <
> >>                       0x170 (PIN_INPUT_PULLUP | MUX_MODE0)    /* uart0_rxd.uart0_rxd */
> >>
> >> @@ -222,6 +229,15 @@
> >>
> >>  };
> >>
> >> +
> >> +&i2c2 {
> >> +     pinctrl-names = "default";
> >> +     pinctrl-0 = <&i2c2_pins>;
> >> +
> >> +     status = "okay";
> >> +     clock-frequency = <100000>;
> >> +};
> >> +
> >
> > If these pins are not used for i2c2 on some capes, this device
> > should be set to status = "disabled" state by default. Then
> > u-boot could re-enable it on the boards that have i2c2 in use.
> 
> To-date, this is the i2c bus that all capes have placed an at24 eeprom
> for cape identification.

And how many capes actually implement the eeprom cape identification
out of the available capes? :)

Tony
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