From d652a344a009854b72d7df97c11d2582b9e11c9a Mon Sep 17 00:00:00 2001 From: Ben Gardiner Date: Mon, 16 Jan 2012 07:43:15 +0000 Subject: [PATCH] arm, davinci: add PLL0 prediv to da850 lowlevel setup 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 Cc: Christian Riesch CC: Heiko Schocher Cc: Sandeep Paulraj Cc: Tom Rini Cc: Albert ARIBAUD Acked-by: Heiko Schocher Acked-by: Christian Riesch --- 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 deletion(-) diff --git a/arch/arm/cpu/arm926ejs/davinci/da850_lowlevel.c b/arch/arm/cpu/arm926ejs/davinci/da850_lowlevel.c index a532f8ab60..eec06bc54d 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 f1396e3194..1c8d83fb5b 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) -- 2.30.2