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clk: imx: keep uart clock on during system boot 

Keep uart clocks enabled when earlyprintk or
earlycon is active.

Signed-off-by: Jacky Bai <ping.bai@nxp.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
This commit is contained in:
Jacky Bai 2019-04-25 08:10:08 +00:00 committed by Stephen Boyd
parent b4a4cb5a04
commit 8cd117e712
1 changed files with 16 additions and 0 deletions
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16
drivers/clk/imx/clk-imx6sll.c
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@ -76,6 +76,20 @@ static u32 share_count_ssi1;
static u32 share_count_ssi2;
static u32 share_count_ssi3;
static struct clk ** const uart_clks[] __initconst = {
&clks[IMX6SLL_CLK_UART1_IPG],
&clks[IMX6SLL_CLK_UART1_SERIAL],
&clks[IMX6SLL_CLK_UART2_IPG],
&clks[IMX6SLL_CLK_UART2_SERIAL],
&clks[IMX6SLL_CLK_UART3_IPG],
&clks[IMX6SLL_CLK_UART3_SERIAL],
&clks[IMX6SLL_CLK_UART4_IPG],
&clks[IMX6SLL_CLK_UART4_SERIAL],
&clks[IMX6SLL_CLK_UART5_IPG],
&clks[IMX6SLL_CLK_UART5_SERIAL],
NULL
};
static void __init imx6sll_clocks_init(struct device_node *ccm_node)
{
struct device_node *np;
@ -334,6 +348,8 @@ static void __init imx6sll_clocks_init(struct device_node *ccm_node)
clk_data.clk_num = ARRAY_SIZE(clks);
of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
imx_register_uart_clocks(uart_clks);
/* Lower the AHB clock rate before changing the clock source. */
clk_set_rate(clks[IMX6SLL_CLK_AHB], 99000000);