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aspeed: Add P-Bus clock in ast2500 clock driver

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Add P-Bus Clock support to ast2500 clock driver.
This is the clock used by I2C devices.

Signed-off-by: Maxim Sloyko <maxims@google.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
maxims@google.com 2017-04-17 12:00:29 -07:00 committed by Tom Rini
parent 3ef7f12cdd
commit 4999bb06cc
2 changed files with 13 additions and 1 deletions
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3
arch/arm/include/asm/arch-aspeed/scu_ast2500.h
View file

@ -21,7 +21,8 @@
#define SCU_MPLL_NUM_MASK 0xff
#define SCU_MPLL_POST_SHIFT 13
#define SCU_MPLL_POST_MASK 0x3f
#define SCU_PCLK_DIV_SHIFT 23
#define SCU_PCLK_DIV_MASK 7
#define SCU_HPLL_DENUM_SHIFT 0
#define SCU_HPLL_DENUM_MASK 0x1f
#define SCU_HPLL_NUM_SHIFT 5

11
drivers/clk/aspeed/clk_ast2500.c
View file

@ -110,6 +110,17 @@ static ulong ast2500_clk_get_rate(struct clk *clk)
rate = ast2500_get_mpll_rate(clkin,
readl(&priv->scu->m_pll_param));
break;
case BCLK_PCLK:
{
ulong apb_div = 4 + 4 * ((readl(&priv->scu->clk_sel1)
>> SCU_PCLK_DIV_SHIFT) &
SCU_PCLK_DIV_MASK);
rate = ast2500_get_hpll_rate(clkin,
readl(&priv->scu->
h_pll_param));
rate = rate / apb_div;
}
break;
case PCLK_UART1:
rate = ast2500_get_uart_clk_rate(priv->scu, 1);
break;