[PATCH v1 3/3] xea: config: Disable CONFIG_SPL_OF_PLATDATA_PARENT on XEA (imx28)

[Tom Rini]

On Sat, Dec 26, 2020 at 01:09:02AM +0100, Lukasz Majewski wrote:

> On the XEA board (imx28) one needs in the SPL support for GPIO, MMC and
> SPI. Two last ones are necessary for booting the device. The GPIO support
> allows deciding which medium will be used. For example the GPIO DTS node
> (gpio at 0 at imx28.dtsi) has pinctrl parent (pinctrl at 80018000) for which we
> don't need driver asigned for correct operation.
> In the spl/dts/dt-platdata.c the gpio at 0 has index 4 and its parent -
> pinctrl at 80018000 has index 5.
> 
> In the bind_drivers_pass() function (at drivers/core/lists.c) call to
> device_bind_by_name() for `fsl_imx23_pinctrl` returns -2, which is
> expected.
> 
> With current setup - when the SPL_OF_PLATDATA_PARENT=y
> The gpio at 0 node with index 4 is skipped as its parent with 5 is not yet
> bound. It cannot be as we don't need and provide the driver for it.
> As a result the gpio at 0 is never bound and we end up with bricked board in
> the SPL stage.
> 
> When CONFIG_SPL_OF_PLATDATA_PARENT is NOT set, all entries from
> spl/dts/dt-platdata.c are scanned in ascending index order, so gpio at 0 is
> properly initialized. For `fsl_imx_pinctrl` we simply check 10 times if
> the driver for is available (which is not) and exit.
> 
> As a result the GPIOs are initialized and can be used in early SPL stage.
> This commit fixes XEA regression introduced with e41651fffda7da55f6.
> 
> Signed-off-by: Lukasz Majewski <lukma at denx.de>
> 

Applied to u-boot/master, thanks!

-- 
Tom
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