[U-Boot] soft-i2c and i2c-gpio issues with at91

[Heiko Schocher]

Hello Matt,

Am 22.05.2015 16:35, schrieb Matt Wood:
> Hi all, I am trying to get a bitbanged i2c port working with u-boot on an
> Atmel SAMA5D3 platform.  I have added DT bindings to support the I2C
> drivers however when I try to select the bus on the u-boot command line I
> consistently get an error in gpio-uclass:

I am not sure, if DM is supported on this plattform yet, I added
Andreas Biesmann (AT91) and Simon Glass (DM) to Cc, maybe one of them
can help you here ...

bye,
Heiko
>
> _gpio_request_by_name_nodev: uclass_get_device_by_of_offset failed
>
> _gpio_request_by_name_nodev: Node 'soft-i2c at 1', property 'gpios', failed to
> request GPIO index 0: -19
>
> Each driver always fails at the get_dev_by_offset routine.
>
> I suspect some issue with the way the GPIO is defined or is not setup
> correctly.  Has anyone seen this or have any advice on where to look?
>
> This is the relevant part of the device tree:
>
> aliases {
>
>                  i2c0 = "/soft-i2c at 1";
>
> };
>
>
> soft-i2c at 1 {
>
>                  #address-cells = <1>;
>
>                  #size-cells = <0>;
>
> /*              compatible = "soft-i2c"; */
>
>                  compatible = "i2c-gpio";
>
> /*              clock-frequency = <100000>; */
>
> /*              pinctrl-names = "default";
>
>                  pinctrl-0 = <&pinctrl_soft_i2c>; */
>
>                  /* Define the proper GPIO pins */
>
>
> /*
>
>
>                  clock-pin = <&pioA 31 0>;
>
>                  data-pin = <&pioA 30 0>; */
>
>                  gpios = <&pioA 30 0     /* SDA */
>
>                           &pioA 31 0>;   /* SCL */
>
>
>                  i2c-gpio,sda-open-drain;
>
>                  i2c-gpio,scl-open-drain;
>
>                  i2c-gpio,delay-us =<3>;
>
>
>          };
>
> };
>
>
> Thanks, Matt.
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