The OMAP-L138 has a pre-divider available on PLL0.
Add support to da850_lowlevel.c for configuring PLL0's pre-divider. This is to achieve certain OPP's -- e.g. the 372MHz OPP used also by Linux.
Signed-off-by: Ben Gardiner bengardiner@nanometrics.ca Cc: Christian Riesch christian.riesch@omicron.at CC: Heiko Schocher hs@denx.de Cc: Sandeep Paulraj s-paulraj@ti.com Cc: Tom Rini tom.rini@gmail.com Cc: Albert ARIBAUD albert.u.boot@aribaud.net --- arch/arm/cpu/arm926ejs/davinci/da850_lowlevel.c | 7 +++++++ arch/arm/include/asm/arch-davinci/pll_defs.h | 3 ++- 2 files changed, 9 insertions(+), 1 deletions(-)
diff --git a/arch/arm/cpu/arm926ejs/davinci/da850_lowlevel.c b/arch/arm/cpu/arm926ejs/davinci/da850_lowlevel.c index a532f8a..eec06bc 100644 --- a/arch/arm/cpu/arm926ejs/davinci/da850_lowlevel.c +++ b/arch/arm/cpu/arm926ejs/davinci/da850_lowlevel.c @@ -85,6 +85,13 @@ int da850_pll_init(struct davinci_pllc_regs *reg, unsigned long pllmult) /* Enable the PLL from Disable Mode PLLDIS bit to 0 */ clrbits_le32(®->pllctl, PLLCTL_PLLDIS);
+#if defined(CONFIG_SYS_DA850_PLL0_PREDIV) + /* program the prediv */ + if (reg == davinci_pllc0_regs && CONFIG_SYS_DA850_PLL0_PREDIV) + writel((PLL_DIVEN | CONFIG_SYS_DA850_PLL0_PREDIV), + ®->prediv); +#endif + /* Program the required multiplier value in PLLM */ writel(pllmult, ®->pllm);
diff --git a/arch/arm/include/asm/arch-davinci/pll_defs.h b/arch/arm/include/asm/arch-davinci/pll_defs.h index f1396e3..1c8d83f 100644 --- a/arch/arm/include/asm/arch-davinci/pll_defs.h +++ b/arch/arm/include/asm/arch-davinci/pll_defs.h @@ -68,7 +68,8 @@ struct dv_pll_regs { #define PLLCTL_RES_9 (1 << 8) #define PLLCTL_EXTCLKSRC (1 << 9)
-#define PLL_POSTDEN (1 << 15) +#define PLL_DIVEN (1 << 15) +#define PLL_POSTDEN PLL_DIVEN
#define PLL_SCSCFG3_DIV45PENA (1 << 2) #define PLL_SCSCFG3_EMA_CLKSRC (1 << 1)