clk: socfpga: Add a second parent option for the dbg_base_clk

The debug base clock can be bypassed from the main PLL to the OSC1 clock.
The bypass register is the staysoc1(0x10) register that is in the clock
manager.

This patch adds the option to get the correct parent for the debug base
clock.

Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

diff --git a/drivers/clk/socfpga/clk-periph.c b/drivers/clk/socfpga/clk-periph.c
index 0c66863314933179413b87a2e004c6dbce72cc49..52c883ea7706715d18b9ec8dc676fbc98060acd7 100644 (file)
--- a/drivers/clk/socfpga/clk-periph.c
+++ b/drivers/clk/socfpga/clk-periph.c
@@ -44,8 +44,17 @@ static unsigned long clk_periclk_recalc_rate(struct clk_hw *hwclk,
        return parent_rate / div;
 }
 
+static u8 clk_periclk_get_parent(struct clk_hw *hwclk)
+{
+       u32 clk_src;
+
+       clk_src = readl(clk_mgr_base_addr + CLKMGR_DBCTRL);
+       return clk_src & 0x1;
+}
+
 static const struct clk_ops periclk_ops = {
        .recalc_rate = clk_periclk_recalc_rate,
+       .get_parent = clk_periclk_get_parent,
 };
 
 static __init void __socfpga_periph_init(struct device_node *node,
@@ -55,7 +64,7 @@ static __init void __socfpga_periph_init(struct device_node *node,
        struct clk *clk;
        struct socfpga_periph_clk *periph_clk;
        const char *clk_name = node->name;
-       const char *parent_name;
+       const char *parent_name[SOCFPGA_MAX_PARENTS];
        struct clk_init_data init;
        int rc;
        u32 fixed_div;
@@ -89,9 +98,10 @@ static __init void __socfpga_periph_init(struct device_node *node,
        init.name = clk_name;
        init.ops = ops;
        init.flags = 0;
-       parent_name = of_clk_get_parent_name(node, 0);
-       init.parent_names = &parent_name;
-       init.num_parents = 1;
+
+       init.num_parents = of_clk_parent_fill(node, parent_name,
+                                             SOCFPGA_MAX_PARENTS);
+       init.parent_names = parent_name;
 
        periph_clk->hw.hw.init = &init;
 

diff --git a/drivers/clk/socfpga/clk.h b/drivers/clk/socfpga/clk.h
index aa2741dbe81abb4704ef357ef5fcbed48842ff1a..814c7247bf73b071fcc2f19770a005425b404294 100644 (file)
--- a/drivers/clk/socfpga/clk.h
+++ b/drivers/clk/socfpga/clk.h
@@ -22,6 +22,7 @@
 /* Clock Manager offsets */
 #define CLKMGR_CTRL            0x0
 #define CLKMGR_BYPASS          0x4
+#define CLKMGR_DBCTRL          0x10
 #define CLKMGR_L4SRC           0x70
 #define CLKMGR_PERPLL_SRC      0xAC