clk: imx25: 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, 12 insertions, 0 deletions

diff --git a/drivers/clk/imx/clk-imx25.c b/drivers/clk/imx/clk-imx25.c
index ec1a4c1dacf1..c4c141cab444 100644
--- a/drivers/clk/imx/clk-imx25.c
+++ b/drivers/clk/imx/clk-imx25.c
@@ -86,6 +86,16 @@ enum mx25_clks {
 
 static struct clk *clk[clk_max];
 
+static struct clk ** const uart_clks[] __initconst = {
+        &clk[uart_ipg_per],
+        &clk[uart1_ipg],
+        &clk[uart2_ipg],
+        &clk[uart3_ipg],
+        &clk[uart4_ipg],
+        &clk[uart5_ipg],
+        NULL
+};
+
 static int __init __mx25_clocks_init(unsigned long osc_rate,
                                      void __iomem *ccm_base)
 {
@@ -233,6 +243,8 @@ static int __init __mx25_clocks_init(unsigned long osc_rate,
          */
         clk_set_parent(clk[cko_sel], clk[ipg]);
 
+        imx_register_uart_clocks(uart_clks);
+
         return 0;
 }