[PATCH v3] ARM: dts: bcm2711-rpi-cm4-io: Add rtc on a pinctrl-muxed i2c bus

[Florian Fainelli]

On 1/18/22 11:45 AM, Jean-Michel Hautbois wrote:
> Hi Uwe,
> 
> Thanks for the patch !
> 
> On 31/12/2021 12:51, Uwe Kleine-König wrote:
>> The cm4-io board comes with an PCF85063. Add it to the device tree to
>> make
>> it usable. The i2c0 bus can use two different pinmux settings to use
>> different pins. To keep the bus appearing on the usual pin pair (gpio0 +
>> gpio1) use a pinctrl-muxed setting as the vendor dts does.
>>
>> Note that if you modified the dts before to add devices to the i2c bus
>> appearing on pins gpio0 + gpio1 (either directly in the dts or using an
>> overlay), you have to put these into the i2c at 0 node introduced here now.
>>
>> Reviewed-by: Maxime Ripard <maxime at cerno.tech>
>> Signed-off-by: Uwe Kleine-König <uwe at kleine-koenig.org>
>> ---
>> Hello,
>>
>> changes since v2 (20211216212948.nrfmm4jpbhoknfr5 at pengutronix.de):
>>
>>   - add Maxime's R-b tag
>>   - change the commit log wording to say vendor dts instead of upstream
>>     dts
>>   - Add a paragraph to the commit log about breakage this commits
>>     introduces.
>>
>> Best regards
>> Uwe
>>
>>   arch/arm/boot/dts/bcm2711-rpi-cm4-io.dts | 35 ++++++++++++++++++++++++
>>   1 file changed, 35 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/bcm2711-rpi-cm4-io.dts
>> b/arch/arm/boot/dts/bcm2711-rpi-cm4-io.dts
>> index 19600b629be5..5ddad146b541 100644
>> --- a/arch/arm/boot/dts/bcm2711-rpi-cm4-io.dts
>> +++ b/arch/arm/boot/dts/bcm2711-rpi-cm4-io.dts
>> @@ -18,6 +18,41 @@ led-pwr {
>>               linux,default-trigger = "default-on";
>>           };
>>       };
>> +
>> +    i2c0mux {
>> +        compatible = "i2c-mux-pinctrl";
>> +        #address-cells = <1>;
>> +        #size-cells = <0>;
>> +
>> +        i2c-parent = <&i2c0>;
>> +
>> +        pinctrl-names = "i2c0", "i2c0-vc";
>> +        pinctrl-0 = <&i2c0_gpio0>;
>> +        pinctrl-1 = <&i2c0_gpio44>;
>> +
>> +        i2c at 0 {
>> +            reg = <0>;
>> +            #address-cells = <1>;
>> +            #size-cells = <0>;
>> +        };
>> +
>> +        i2c at 1 {
>> +            reg = <1>;
>> +            #address-cells = <1>;
>> +            #size-cells = <0>;
>> +
>> +            rtc at 51 {
>> +                /* Attention: An alarm resets the machine */
>> +                compatible = "nxp,pcf85063";
>> +                reg = <0x51>;
>> +            };
>> +        };
>> +    };
>> +};
> 
> This is also needed for camera and display support.
> I tested it successfully with imx219 + unicam on mainline.

Thanks for testing, can you reply with a Tested-by tag so it could be
applied to the commit message when this gets picked up?
-- 
Florian