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clk: imx6: 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 18:54:03 +02:00 committed by Shawn Guo
parent 89981a6f7b
commit 0822f93373
3 changed files with 24 additions and 0 deletions
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8
drivers/clk/imx/clk-imx6q.c
View File

@ -130,6 +130,12 @@ static inline int clk_on_imx6dl(void)
return of_machine_is_compatible("fsl,imx6dl");
}
static struct clk ** const uart_clks[] __initconst = {
&clk[IMX6QDL_CLK_UART_IPG],
&clk[IMX6QDL_CLK_UART_SERIAL],
NULL
};
static void __init imx6q_clocks_init(struct device_node *ccm_node)
{
struct device_node *np;
@ -541,5 +547,7 @@ static void __init imx6q_clocks_init(struct device_node *ccm_node)
/* All existing boards with PCIe use LVDS1 */
if (IS_ENABLED(CONFIG_PCI_IMX6))
clk_set_parent(clk[IMX6QDL_CLK_LVDS1_SEL], clk[IMX6QDL_CLK_SATA_REF_100M]);
imx_register_uart_clocks(uart_clks);
}
CLK_OF_DECLARE(imx6q, "fsl,imx6q-ccm", imx6q_clocks_init);

8
drivers/clk/imx/clk-imx6sl.c
View File

@ -184,6 +184,12 @@ void imx6sl_set_wait_clk(bool enter)
imx6sl_enable_pll_arm(false);
}
static struct clk ** const uart_clks[] __initconst = {
&clks[IMX6SL_CLK_UART],
&clks[IMX6SL_CLK_UART_SERIAL],
NULL
};
static void __init imx6sl_clocks_init(struct device_node *ccm_node)
{
struct device_node *np;
@ -439,5 +445,7 @@ static void __init imx6sl_clocks_init(struct device_node *ccm_node)
clk_set_parent(clks[IMX6SL_CLK_LCDIF_AXI_SEL],
clks[IMX6SL_CLK_PLL2_PFD2]);
imx_register_uart_clocks(uart_clks);
}
CLK_OF_DECLARE(imx6sl, "fsl,imx6sl-ccm", imx6sl_clocks_init);

8
drivers/clk/imx/clk-imx6sx.c
View File

@ -135,6 +135,12 @@ static u32 share_count_ssi1;
static u32 share_count_ssi2;
static u32 share_count_ssi3;
static struct clk ** const uart_clks[] __initconst = {
&clks[IMX6SX_CLK_UART_IPG],
&clks[IMX6SX_CLK_UART_SERIAL],
NULL
};
static void __init imx6sx_clocks_init(struct device_node *ccm_node)
{
struct device_node *np;
@ -557,5 +563,7 @@ static void __init imx6sx_clocks_init(struct device_node *ccm_node)
clk_set_parent(clks[IMX6SX_CLK_QSPI1_SEL], clks[IMX6SX_CLK_PLL2_BUS]);
clk_set_parent(clks[IMX6SX_CLK_QSPI2_SEL], clks[IMX6SX_CLK_PLL2_BUS]);
imx_register_uart_clocks(uart_clks);
}
CLK_OF_DECLARE(imx6sx, "fsl,imx6sx-ccm", imx6sx_clocks_init);