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clk: imx27: retain early UART clocks during kernel init

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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 18:53:59 +02:00 committed by Shawn Guo
parent 517c7f9302
commit 6f18713163
1 changed files with 13 additions and 0 deletions
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13
drivers/clk/imx/clk-imx27.c
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@ -47,6 +47,17 @@ static const char *ssi_sel_clks[] = { "spll_gate", "mpll", };
static struct clk *clk[IMX27_CLK_MAX];
static struct clk_onecell_data clk_data;
static struct clk ** const uart_clks[] __initconst = {
&clk[IMX27_CLK_PER1_GATE],
&clk[IMX27_CLK_UART1_IPG_GATE],
&clk[IMX27_CLK_UART2_IPG_GATE],
&clk[IMX27_CLK_UART3_IPG_GATE],
&clk[IMX27_CLK_UART4_IPG_GATE],
&clk[IMX27_CLK_UART5_IPG_GATE],
&clk[IMX27_CLK_UART6_IPG_GATE],
NULL
};
static void __init _mx27_clocks_init(unsigned long fref)
{
BUG_ON(!ccm);
@ -163,6 +174,8 @@ static void __init _mx27_clocks_init(unsigned long fref)
clk_prepare_enable(clk[IMX27_CLK_EMI_AHB_GATE]);
imx_register_uart_clocks(uart_clks);
imx_print_silicon_rev("i.MX27", mx27_revision());
}