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clk: imx5: 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>
This commit is contained in:
Lucas Stach 2015-09-21 18:54:02 +02:00 committed by Shawn Guo
parent 57d5a4c3ed
commit 89981a6f7b
1 changed files with 16 additions and 0 deletions
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16
drivers/clk/imx/clk-imx51-imx53.c
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@ -130,6 +130,20 @@ static const char *cpu_podf_sels[] = { "pll1_sw", "step_sel" };
static struct clk *clk[IMX5_CLK_END]; static struct clk *clk[IMX5_CLK_END];
static struct clk_onecell_data clk_data; static struct clk_onecell_data clk_data;
static struct clk ** const uart_clks[] __initconst = {
&clk[IMX5_CLK_UART1_IPG_GATE],
&clk[IMX5_CLK_UART1_PER_GATE],
&clk[IMX5_CLK_UART2_IPG_GATE],
&clk[IMX5_CLK_UART2_PER_GATE],
&clk[IMX5_CLK_UART3_IPG_GATE],
&clk[IMX5_CLK_UART3_PER_GATE],
&clk[IMX5_CLK_UART4_IPG_GATE],
&clk[IMX5_CLK_UART4_PER_GATE],
&clk[IMX5_CLK_UART5_IPG_GATE],
&clk[IMX5_CLK_UART5_PER_GATE],
NULL
};
static void __init mx5_clocks_common_init(void __iomem *ccm_base) static void __init mx5_clocks_common_init(void __iomem *ccm_base)
{ {
clk[IMX5_CLK_DUMMY] = imx_clk_fixed("dummy", 0); clk[IMX5_CLK_DUMMY] = imx_clk_fixed("dummy", 0);
@ -310,6 +324,8 @@ static void __init mx5_clocks_common_init(void __iomem *ccm_base)
clk_prepare_enable(clk[IMX5_CLK_TMAX1]); clk_prepare_enable(clk[IMX5_CLK_TMAX1]);
clk_prepare_enable(clk[IMX5_CLK_TMAX2]); /* esdhc2, fec */ clk_prepare_enable(clk[IMX5_CLK_TMAX2]); /* esdhc2, fec */
clk_prepare_enable(clk[IMX5_CLK_TMAX3]); /* esdhc1, esdhc4 */ clk_prepare_enable(clk[IMX5_CLK_TMAX3]); /* esdhc1, esdhc4 */
imx_register_uart_clocks(uart_clks);
} }
static void __init mx50_clocks_init(struct device_node *np) static void __init mx50_clocks_init(struct device_node *np)