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

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Message-ID: <CAOCHtYiYwx_bEsyqkbUTTAbhBYESzvfBOOYeVuFXPS1dDy0ZKA@mail.gmail.com>
Date:	Mon, 12 May 2014 14:59:18 -0500
From:	Robert Nelson <robertcnelson@...il.com>
To:	Tony Lindgren <tony@...mide.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

>>
>> +     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.

Regards,

-- 
Robert Nelson
http://www.rcn-ee.com/
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