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 <[email protected]>
---
include/configs/omap3_igep00x0.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/include/configs/omap3_igep00x0.h b/include/configs/omap3_igep00x0.h
index 20fbbec..8cc23c1 100644
--- a/include/configs/omap3_igep00x0.h
+++ b/include/configs/omap3_igep00x0.h
@@ -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
--
1.8.3.2
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