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arm: omap3: Enable clocks for peripherals only if they are used 

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>
Acked-by: Igor Grinberg <grinberg@compulab.co.il>
This commit is contained in:
Michael Trimarchi 2013-11-30 07:59:58 +01:00 committed by Tom Rini
parent 74007b8519
commit f33b9bd398
2 changed files with 0 additions and 4 deletions
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2
arch/arm/cpu/armv7/omap3/clock.c
View File

@ -730,8 +730,6 @@ void per_clocks_enable(void)
sr32(&prcm_base->fclken_cam, 0, 32, FCK_CAM_ON); sr32(&prcm_base->fclken_cam, 0, 32, FCK_CAM_ON);
sr32(&prcm_base->iclken_cam, 0, 32, ICK_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); sdelay(1000);
} }

2
arch/arm/include/asm/arch-omap3/clock.h
View File

@ -27,8 +27,6 @@
#define ICK_DSS_ON 0x00000001 #define ICK_DSS_ON 0x00000001
#define FCK_CAM_ON 0x00000001 #define FCK_CAM_ON 0x00000001
#define ICK_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 */ /* Used to index into DPLL parameter tables */
typedef struct { typedef struct {