[U-Boot] [PATCH] OMAP3: igep00x0: Enable required clocks for GPIO that are used.

[Tom Rini]

On Sat, Jan 25, 2014 at 4:52 PM, Enric Balletbo i Serra
<eballetbo at gmail.com> wrote:

> Enable required clocks for GPIO to fix a boot issue introduced by commit
> f33b9bd3984fb11e1d8566a866adc5957b1e1c9d (arm: omap3: Enable clocks for
> peripherals only if they are used).
>
> Without this patch the u-boot freezes after the following messages
>
>   OMAP36XX/37XX-GP ES1.2, CPU-OPP2, L3-200MHz, Max CPU Clock 1 Ghz
>   IGEPv2 + LPDDR/NAND
>   I2C:   ready
>   DRAM:  512 MiB
>   NAND:  512 MiB
>   MMC:   OMAP SD/MMC: 0
>
> Diving into the issue, the sequence that produces the u-boot freezes is
>
>   setup_net_chip
>    |--> gpio_direction_out
>          |--> _set_gpio_dataout
>                |--> __raw_writel
>
> To avoid this we just need enable the clocks for GPIOs that are used, but it
> would be interesting implement a mechanism to protect these situations and
> make sure that the clock is enabled when we request a GPIO.
>
> Signed-off-by: Enric Balletbo i Serra <eballetbo at gmail.com>

Applied to u-boot-ti/master, thanks!

-- 
Tom