[U-Boot] [PATCH V2] arm: omap3: Enable clocks for peripherals only if they are used

[Michael Trimarchi <michael@amarulasolutions.com>]

This patch change the per_clocks_enable() function used in OMAP3
code to enable peripherals clocks. Only required clock should be
activated. So if the board use the uart(x) as a console we need
to activate it. The Board's config should include define to enable
every subsystem that the board use. For a complete list
of affected peripherals, registers CM_FCLKEN_PER and CM_ICLKEN_PER
should be checked.
Right now the bootloader can enable and disable clocks for:
uart(x) using CONFIG_SYS_NS16550
gpio bank (x) using CONFIG_OMAP3_GPIO_X with X = { 2, 3, 4, 5, 6 }
i2c bus using CONFIG_DRIVER_OMAP34XX_I2C.

Not required gptimer(x) and mcbsp(x) for booting are disabled by default and
are not supported by any define.
Their activation need to included in the per_clocks_enable if the
peripheral is included. Not booting board should enable the peripheral
clock connected to their driver

Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Cc: Igor Grinberg <grinberg@compulab.co.il>
Cc: Tom Rini <trini@ti.com>
---
Changes in V2:
	add a better comment for describe the problems that could
	be raised on some boards

 arch/arm/cpu/armv7/omap3/clock.c        | 2 --
 arch/arm/include/asm/arch-omap3/clock.h | 2 --
 2 files changed, 4 deletions(-)

diff --git a/arch/arm/cpu/armv7/omap3/clock.c b/arch/arm/cpu/armv7/omap3/clock.c
index 14fc7e8..1bc27bd 100644
--- a/arch/arm/cpu/armv7/omap3/clock.c
+++ b/arch/arm/cpu/armv7/omap3/clock.c
@@ -730,8 +730,6 @@ void per_clocks_enable(void)
 		sr32(&prcm_base->fclken_cam, 0, 32, FCK_CAM_ON);
 		sr32(&prcm_base->iclken_cam, 0, 32, ICK_CAM_ON);
 	}
-	sr32(&prcm_base->fclken_per, 0, 32, FCK_PER_ON);
-	sr32(&prcm_base->iclken_per, 0, 32, ICK_PER_ON);
 
 	sdelay(1000);
 }
diff --git a/arch/arm/include/asm/arch-omap3/clock.h b/arch/arm/include/asm/arch-omap3/clock.h
index be669c1..1912cc9 100644
--- a/arch/arm/include/asm/arch-omap3/clock.h
+++ b/arch/arm/include/asm/arch-omap3/clock.h
@@ -27,8 +27,6 @@
 #define ICK_DSS_ON	0x00000001
 #define FCK_CAM_ON	0x00000001
 #define ICK_CAM_ON	0x00000001
-#define FCK_PER_ON	0x0003ffff
-#define ICK_PER_ON	0x0003ffff
 
 /* Used to index into DPLL parameter tables */
 typedef struct {
-- 
1.8.1.2