arm: imx8: factor out uart init code
New imx8 boards started adding duplicated UART init code.
Factor out this to common function sc_pm_setup_uart().
Signed-off-by: Anatolij Gustschin <agust@denx.de>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
diff --git a/arch/arm/include/asm/arch-imx8/sys_proto.h b/arch/arm/include/asm/arch-imx8/sys_proto.h
index 73ffaba..3f5bbe9 100644
--- a/arch/arm/include/asm/arch-imx8/sys_proto.h
+++ b/arch/arm/include/asm/arch-imx8/sys_proto.h
@@ -3,6 +3,7 @@
* Copyright 2018 NXP
*/
+#include <asm/arch/sci/sci.h>
#include <asm/mach-imx/sys_proto.h>
#include <linux/types.h>
@@ -17,3 +18,4 @@
enum boot_device get_boot_device(void);
int print_bootinfo(void);
+int sc_pm_setup_uart(sc_rsrc_t uart_rsrc, sc_pm_clock_rate_t clk_rate);
diff --git a/arch/arm/mach-imx/imx8/Makefile b/arch/arm/mach-imx/imx8/Makefile
index 31ad169..92b5c56 100644
--- a/arch/arm/mach-imx/imx8/Makefile
+++ b/arch/arm/mach-imx/imx8/Makefile
@@ -4,4 +4,4 @@
# SPDX-License-Identifier: GPL-2.0+
#
-obj-y += cpu.o iomux.o
+obj-y += cpu.o iomux.o misc.o
diff --git a/arch/arm/mach-imx/imx8/misc.c b/arch/arm/mach-imx/imx8/misc.c
new file mode 100644
index 0000000..fb92362
--- /dev/null
+++ b/arch/arm/mach-imx/imx8/misc.c
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0+
+#include <common.h>
+#include <asm/arch/sci/sci.h>
+
+int sc_pm_setup_uart(sc_rsrc_t uart_rsrc, sc_pm_clock_rate_t clk_rate)
+{
+ sc_pm_clock_rate_t rate = clk_rate;
+ int ret;
+
+ /* Power up UARTn */
+ ret = sc_pm_set_resource_power_mode(-1, uart_rsrc, SC_PM_PW_MODE_ON);
+ if (ret)
+ return ret;
+
+ /* Set UARTn clock root to 'rate' MHz */
+ ret = sc_pm_set_clock_rate(-1, uart_rsrc, SC_PM_CLK_PER, &rate);
+ if (ret)
+ return ret;
+
+ /* Enable UARTn clock root */
+ ret = sc_pm_clock_enable(-1, uart_rsrc, SC_PM_CLK_PER, true, false);
+ if (ret)
+ return ret;
+
+ return 0;
+}