(adding Przemyslaw who uses the I2C GPIO driver) Hi,
On 25 May 2015 at 22:30, Heiko Schocher <h...@denx.de> wrote: > 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@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@1"; >> >> }; >> >> >> soft-i2c@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>; >> >> >> }; >> >> }; Can you post the output of 'dm tree' and 'dm uclass'? I wonder if your GPIO driver is not connected up properly? Are you using i2c-gpio.c? That driver should work as is on any platform with only device tree additions. Regards, Simon _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot