On Wed, 25 Mar 2015, Johan Hovold wrote:
> Since commit 6e3f62f0793e ("mfd: core: Fix platform-device id
> generation") we honour PLATFORM_DEVID_AUTO and PLATFORM_DEVID_NONE when
> registering mfd-devices.
>
> Unfortunately, some mfd-drivers rely on the old behaviour of generating
> platform-device ids by adding the cell id also to the special value of
> PLATFORM_DEVID_NONE. The resulting platform ids are not only used to
> generate device-unique names, but are also used instead of the cell id
> to identify cells when probing subdevices.
>
> These drivers should be updated to use PLATFORM_DEVID_AUTO, which would
> also allow more than one device to be registered without resorting to
> hacks (see for example wm831x), but lets fix the regression first by
> partially reverting the above mentioned commit with respect to
> PLATFORM_DEVID_NONE.
>
> Fixes: 6e3f62f0793e ("mfd: core: Fix platform-device id generation")
> Cc: stable <stable@xxxxxxxxxxxxxxx> # v3.19
> Reported-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
> Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
> ---
> drivers/mfd/mfd-core.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
Applied, thanks.
> diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c
> index 2a87f69be53d..1aed3b7b8d9b 100644
> --- a/drivers/mfd/mfd-core.c
> +++ b/drivers/mfd/mfd-core.c
> @@ -128,7 +128,7 @@ static int mfd_add_device(struct device *parent, int id,
> int platform_id;
> int r;
>
> - if (id < 0)
> + if (id == PLATFORM_DEVID_AUTO)
> platform_id = id;
> else
> platform_id = id + cell->id;
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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