[U-Boot] Device tree for Atmel SAMA5D31

[U-Boot] Device tree for Atmel SAMA5D31

[Bo Shen]

Hi Andy,
   I suggest this question go to linux arm kernel mailing list.

On 10/09/2014 08:24 PM, Andy Pont wrote:
> This isn't strictly a U-Boot issue but I am hoping that there are
> appropriately knowledgeable people here who will be able to help!
>
> I am working on a Linux driver for an I2C RTC device and need to add the
> correct definitions into the device tree for the SAMA5D31 to be passed to
> the kernel at boot time.  I have added:
>
> i2c0: i2c at f0014000 {
>          status = "okay";
>
>          rv8523c3 at 68 {
>                  compatible = "mc,rv8523c3";
>                  reg = <0x68>;
>          };
> };
>
> This sets up enough to allow the basic clock functions within the RTC to
> work correctly and the hwclock command within Busybox to work correctly.  I
> need to add in the definitions for a GPIO (PE31) to be used as the alarm
> interrupt pin and can't get my head around the definitions needed within the
> device tree.  I have tried adding the following
>
> interrupt-parent = <&pioE>;
> interrupts = <31>;
>
> When the RTC driver is loaded by Linux the client->irq variable in the probe
> function doesn't contain a value > 0 and so doesn't setup an interrupt.
>
> Any ideas on the correct definitions needed?

Please take this file <arch/arm/boot/dts/sama5d3xdm.dtsi> as a 
reference, qt1070 use GPIO PIOE 31 as interrupt. it conflict with your 
setting.

> Thanks (and apologies for the noise),
>
> Andy.

Best Regards,
Bo Shen

[U-Boot] Device tree for Atmel SAMA5D31

[Andy Pont]

This isn't strictly a U-Boot issue but I am hoping that there are
appropriately knowledgeable people here who will be able to help!
 
I am working on a Linux driver for an I2C RTC device and need to add the
correct definitions into the device tree for the SAMA5D31 to be passed to
the kernel at boot time.  I have added:

i2c0: i2c at f0014000 {
        status = "okay";

        rv8523c3 at 68 {
                compatible = "mc,rv8523c3";
                reg = <0x68>;
        };
};

This sets up enough to allow the basic clock functions within the RTC to
work correctly and the hwclock command within Busybox to work correctly.  I
need to add in the definitions for a GPIO (PE31) to be used as the alarm
interrupt pin and can't get my head around the definitions needed within the
device tree.  I have tried adding the following

interrupt-parent = <&pioE>;
interrupts = <31>;

When the RTC driver is loaded by Linux the client->irq variable in the probe
function doesn't contain a value > 0 and so doesn't setup an interrupt.

Any ideas on the correct definitions needed?

Thanks (and apologies for the noise),

Andy.