[PATCH 4/4] clk: agilex/stratix10/n5x: fix how the bypass_reg is handled

[Dinh Nguyen <dinguyen@kernel.org>]

If the bypass_reg is set, then we can return the bypass parent, however,
if there is not a bypass_reg, we need to figure what the correct parent
mux is.

The previous code never handled the parent mux if there was a
bypass_reg.

Fixes: 80c6b7a0894f ("clk: socfpga: agilex: add clock driver for the Agilex platform")
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
---
 drivers/clk/socfpga/clk-periph-s10.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/socfpga/clk-periph-s10.c b/drivers/clk/socfpga/clk-periph-s10.c
index e5a5fef76df7..e2aad5d37611 100644
--- a/drivers/clk/socfpga/clk-periph-s10.c
+++ b/drivers/clk/socfpga/clk-periph-s10.c
@@ -66,14 +66,19 @@ static u8 clk_periclk_get_parent(struct clk_hw *hwclk)
 	u32 clk_src, mask;
 	u8 parent;
 
+	/* handle the bypass first */
 	if (socfpgaclk->bypass_reg) {
 		mask = (0x1 << socfpgaclk->bypass_shift);
 		parent = ((readl(socfpgaclk->bypass_reg) & mask) >>
 			   socfpgaclk->bypass_shift);
-	} else {
+		if (parent)
+			return parent;
+	}
+
+	if (socfpgaclk->hw.reg) {
 		clk_src = readl(socfpgaclk->hw.reg);
 		parent = (clk_src >> CLK_MGR_FREE_SHIFT) &
-			CLK_MGR_FREE_MASK;
+			  CLK_MGR_FREE_MASK;
 	}
 	return parent;
 }
-- 
2.25.1