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| H A D | omap3_igep00x0.h | dd1e8583ee533a349c03ed4d75446898fe8dbac6 Sat Jan 25 21:52:22 UTC 2014 Enric Balletbo i Serra <eballetbo@gmail.com> OMAP3: igep00x0: Enable required clocks for GPIO that are used.
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@gmail.com>
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