clk: imx35: retain early UART clocks during kernel init

Make sure to keep UART clocks enabled during kernel init if
earlyprintk or earlycon are active.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/clk/imx/clk-imx35.c b/drivers/clk/imx/clk-imx35.c
index 76c463dcdb1c..a71d24cb4c06 100644
--- a/drivers/clk/imx/clk-imx35.c
+++ b/drivers/clk/imx/clk-imx35.c
@@ -84,6 +84,14 @@ enum mx35_clks {
 
 static struct clk *clk[clk_max];
 
+static struct clk ** const uart_clks[] __initconst = {
+        &clk[ipg],
+        &clk[uart1_gate],
+        &clk[uart2_gate],
+        &clk[uart3_gate],
+        NULL
+};
+
 static void __init _mx35_clocks_init(void)
 {
         void __iomem *base;
@@ -237,6 +245,8 @@ static void __init _mx35_clocks_init(void)
          */
         clk_prepare_enable(clk[scc_gate]);
 
+        imx_register_uart_clocks(uart_clks);
+
         imx_print_silicon_rev("i.MX35", mx35_revision());
 }