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OMAP3: igep00x0: Enable required clocks for GPIO that are used.

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Enable required clocks for GPIO to fix a boot issue introduced by commit
f33b9bd398 (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>
This commit is contained in:
Enric Balletbo i Serra 2014-01-25 22:52:22 +01:00 committed by Tom Rini
parent 4b75fd5100
commit dd1e8583ee
1 changed files with 5 additions and 0 deletions
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5
include/configs/omap3_igep00x0.h
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@ -37,6 +37,11 @@
#define CONFIG_SHOW_BOOT_PROGRESS
#endif
/* GPIO banks */
#define CONFIG_OMAP3_GPIO_3 /* GPIO64 .. 95 is in GPIO bank 3 */
#define CONFIG_OMAP3_GPIO_5 /* GPIO128..159 is in GPIO bank 5 */
#define CONFIG_OMAP3_GPIO_6 /* GPIO160..191 is in GPIO bank 6 */
/* USB */
#define CONFIG_MUSB_UDC 1
#define CONFIG_USB_OMAP3 1