[PATCH v2 10/15] aspeed: Add P-Bus clock in ast2500 clock driver

[Maxim Sloyko <maxims@google.com>]

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>
---

Changes in v2: None
Changes in v1: None

 arch/arm/include/asm/arch-aspeed/scu_ast2500.h |  3 ++-
 drivers/clk/aspeed/clk_ast2500.c               | 11 +++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/arch/arm/include/asm/arch-aspeed/scu_ast2500.h b/arch/arm/include/asm/arch-aspeed/scu_ast2500.h
index 1cdd3b9198..319d75e05c 100644
--- a/arch/arm/include/asm/arch-aspeed/scu_ast2500.h
+++ b/arch/arm/include/asm/arch-aspeed/scu_ast2500.h
@@ -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
diff --git a/drivers/clk/aspeed/clk_ast2500.c b/drivers/clk/aspeed/clk_ast2500.c
index 504731271c..9e4c66ea85 100644
--- a/drivers/clk/aspeed/clk_ast2500.c
+++ b/drivers/clk/aspeed/clk_ast2500.c
@@ -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;
-- 
2.13.0.rc1.294.g07d810a77f-goog