On Sat, 21 Apr 2018, Javier Arteaga wrote:
> The UP2 board features a Raspberry Pi compatible pin header (HAT) and a
> board-specific expansion connector (EXHAT). Both expose assorted
> functions from either the SoC (such as GPIO, I2C, SPI, UART...) or other
> on-board devices (ADC, FPGA IP blocks...).
>
> These lines are routed through an on-board FPGA. The platform controller
> in its stock firmware provides register fields to change:
>
> - Line enable (FPGA pins enabled / high impedance)
> - Line direction (SoC driven / FPGA driven)
>
> To enable using SoC GPIOs on the pin header, this arrangement requires
> both configuring the platform controller, and updating the SoC pad
> registers in sync.
>
> Add a frontend pinctrl/GPIO driver that registers a new set of GPIO
> lines for the header pins. When these are requested, the driver
> propagates this request to the backend SoC pinctrl/GPIO driver by
> grabbing a GPIO descriptor for the matching SoC GPIO line. The needed
> mapping for this is retrieved via ACPI properties.
>
> Signed-off-by: Javier Arteaga <javier@xxxxxxxxxx>
> ---
[...]
>
> drivers/mfd/upboard.c | 1 +
> drivers/pinctrl/Kconfig | 13 +
> drivers/pinctrl/Makefile | 1 +
> drivers/pinctrl/pinctrl-upboard.c | 523 ++++++++++++++++++++++++++++++
> 4 files changed, 538 insertions(+)
> create mode 100644 drivers/pinctrl/pinctrl-upboard.c
>
> diff --git a/drivers/mfd/upboard.c b/drivers/mfd/upboard.c
> index 6e4767e4dc41..35111981dfdf 100644
> --- a/drivers/mfd/upboard.c
> +++ b/drivers/mfd/upboard.c
> @@ -132,6 +132,7 @@ static struct upboard_led_data upboard_up2_led_data[] = {
> };
>
> static const struct mfd_cell upboard_up2_mfd_cells[] = {
> + { .name = "upboard-pinctrl" },
> UPBOARD_LED_CELL(upboard_up2_led_data, 0),
> UPBOARD_LED_CELL(upboard_up2_led_data, 1),
> UPBOARD_LED_CELL(upboard_up2_led_data, 2),
Please made this a separate patch.
There aren't any build dependencies between the files.
--
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
