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| author | Mike Turquette <mturquette@ti.com> | 2011-10-07 00:52:58 -0600 |
|---|---|---|
| committer | Paul Walmsley <paul@pwsan.com> | 2011-10-07 00:52:58 -0600 |
| commit | a1900f2efe2d75e0fe5b871421a2f2de2fa68b4e (patch) | |
| tree | ec96f1f2a34d81bc0fa561d3ff404fbd9059531d /arch/arm/mach-omap2/clock44xx.h | |
| parent | be73246058737beec52ae232bcab7776332a9e06 (diff) | |
| download | blackbird-op-linux-a1900f2efe2d75e0fe5b871421a2f2de2fa68b4e.tar.gz blackbird-op-linux-a1900f2efe2d75e0fe5b871421a2f2de2fa68b4e.zip | |
ARM: OMAP4: clock: round_rate and recalc functions for DPLL_ABE
OMAP4 DPLL_ABE can enable a 4X multipler on top of the normal MN multipler
and divider. This is achieved by setting CM_CLKMODE_DPLL_ABE.DPLL_REGM4XEN
bit in CKGEN module of CM1. From the OMAP4 TRM:
Fdpll = Fref x 2 x (4 x M/(N+1)) in case REGM4XEN bit field is set (only
applicable to DPLL_ABE).
Add new round_rate() and recalc() functions for OMAP4, that check the
setting of REGM4XEN bit and handle this appropriately. The new functions
are a simple wrapper on top of the existing omap2_dpll_round_rate() and
omap2_dpll_get_rate() functions to handle the REGM4XEN bit.
The REGM4XEN bit is only implemented for the ABE DPLL on OMAP4 and so
only dpll_abe_ck uses omap4_dpll_regm4xen_round_rate() and
omap4_dpll_regm4xen_recalc() functions.
Signed-off-by: Mike Turquette <mturquette@ti.com>
Tested-by: Jon Hunter <jon-hunter@ti.com>
Signed-off-by: Jon Hunter <jon-hunter@ti.com>
[paul@pwsan.com: fixed attempt to return a negative from a fn returning
unsigned; pass along errors from omap2_dpll_round_rate();
added documentation; added Jon's S-o-b]
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Diffstat (limited to 'arch/arm/mach-omap2/clock44xx.h')
| -rw-r--r-- | arch/arm/mach-omap2/clock44xx.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/clock44xx.h b/arch/arm/mach-omap2/clock44xx.h index 7ceb870e7ab8..287a46f78d97 100644 --- a/arch/arm/mach-omap2/clock44xx.h +++ b/arch/arm/mach-omap2/clock44xx.h @@ -8,6 +8,13 @@ #ifndef __ARCH_ARM_MACH_OMAP2_CLOCK44XX_H #define __ARCH_ARM_MACH_OMAP2_CLOCK44XX_H +/* + * OMAP4430_REGM4XEN_MULT: If the CM_CLKMODE_DPLL_ABE.DPLL_REGM4XEN bit is + * set, then the DPLL's lock frequency is multiplied by 4 (OMAP4430 TRM + * vV Section 3.6.3.3.1 "DPLLs Output Clocks Parameters") + */ +#define OMAP4430_REGM4XEN_MULT 4 + int omap4xxx_clk_init(void); #endif |
