From: Shiraz Hashim shiraz.hashim@st.com
UART in u-boot intends to run on 48MHz clock supplied by USB PLL. Explicitly select the intended clock source.
Signed-off-by: Shiraz Hashim shiraz.hashim@st.com Signed-off-by: Amit Virdi amit.virdi@st.com --- arch/arm/cpu/arm926ejs/spear/cpu.c | 7 ++++++- arch/arm/include/asm/arch-spear/spr_misc.h | 2 ++ 2 files changed, 8 insertions(+), 1 deletions(-)
diff --git a/arch/arm/cpu/arm926ejs/spear/cpu.c b/arch/arm/cpu/arm926ejs/spear/cpu.c index 4dc7d69..8f34aed 100644 --- a/arch/arm/cpu/arm926ejs/spear/cpu.c +++ b/arch/arm/cpu/arm926ejs/spear/cpu.c @@ -31,7 +31,7 @@ int arch_cpu_init(void) { struct misc_regs *const misc_p = (struct misc_regs *)CONFIG_SPEAR_MISCBASE; - u32 periph1_clken; + u32 periph1_clken, periph_clk_cfg;
periph1_clken = readl(&misc_p->periph1_clken);
@@ -43,6 +43,11 @@ int arch_cpu_init(void)
#if defined(CONFIG_PL011_SERIAL) periph1_clken |= MISC_UART0ENB; + + periph_clk_cfg = readl(&misc_p->periph_clk_cfg); + periph_clk_cfg &= ~CONFIG_SPEAR_UARTCLKMSK; + periph_clk_cfg |= CONFIG_SPEAR_UART48M; + writel(periph_clk_cfg, &misc_p->periph_clk_cfg); #endif #if defined(CONFIG_DESIGNWARE_ETH) periph1_clken |= MISC_ETHENB; diff --git a/arch/arm/include/asm/arch-spear/spr_misc.h b/arch/arm/include/asm/arch-spear/spr_misc.h index b10c726..384944d 100644 --- a/arch/arm/include/asm/arch-spear/spr_misc.h +++ b/arch/arm/include/asm/arch-spear/spr_misc.h @@ -110,6 +110,8 @@ struct misc_regs { /* PERIPH_CLK_CFG value */ #define MISC_GPT3SYNTH 0x00000400 #define MISC_GPT4SYNTH 0x00000800 +#define CONFIG_SPEAR_UART48M 0 +#define CONFIG_SPEAR_UARTCLKMSK (0x1 << 4)
/* PRSC_CLK_CFG value */ /*