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: NAnatolij Gustschin <agust@denx.de>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: NPeng Fan <peng.fan@nxp.com>
Reviewed-by: NPeng Fan <peng.fan@nxp.com>

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 @@ struct pass_over_info_t {
 
 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);

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

arch/arm/mach-imx/imx8/misc.c

+// 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;
+}

board/freescale/imx8qm_mek/imx8qm_mek.c

@@ -34,21 +34,11 @@ static void setup_iomux_uart(void)
 
 int board_early_init_f(void)
 {
+	sc_pm_clock_rate_t rate = SC_80MHZ;
 	int ret;
-	/* Set UART0 clock root to 80 MHz */
-	sc_pm_clock_rate_t rate = 80000000;
-
-	/* Power up UART0 */
-	ret = sc_pm_set_resource_power_mode(-1, SC_R_UART_0, SC_PM_PW_MODE_ON);
-	if (ret)
-		return ret;
 
-	ret = sc_pm_set_clock_rate(-1, SC_R_UART_0, 2, &rate);
-	if (ret)
-		return ret;
-
-	/* Enable UART0 clock root */
-	ret = sc_pm_clock_enable(-1, SC_R_UART_0, 2, true, false);
+	/* Set UART0 clock root to 80 MHz */
+	ret = sc_pm_setup_uart(SC_R_UART_0, rate);
 	if (ret)
 		return ret;
 

board/freescale/imx8qxp_mek/imx8qxp_mek.c

@@ -40,21 +40,11 @@ static void setup_iomux_uart(void)
 
 int board_early_init_f(void)
 {
+	sc_pm_clock_rate_t rate = SC_80MHZ;
 	int ret;
-	/* Set UART0 clock root to 80 MHz */
-	sc_pm_clock_rate_t rate = 80000000;
-
-	/* Power up UART0 */
-	ret = sc_pm_set_resource_power_mode(-1, SC_R_UART_0, SC_PM_PW_MODE_ON);
-	if (ret)
-		return ret;
 
-	ret = sc_pm_set_clock_rate(-1, SC_R_UART_0, 2, &rate);
-	if (ret)
-		return ret;
-
-	/* Enable UART0 clock root */
-	ret = sc_pm_clock_enable(-1, SC_R_UART_0, 2, true, false);
+	/* Set UART0 clock root to 80 MHz */
+	ret = sc_pm_setup_uart(SC_R_UART_0, rate);
 	if (ret)
 		return ret;
 

board/toradex/apalis-imx8/apalis-imx8.c

@@ -37,22 +37,11 @@ static void setup_iomux_uart(void)
 
 int board_early_init_f(void)
 {
-	sc_pm_clock_rate_t rate;
+	sc_pm_clock_rate_t rate = SC_80MHZ;
 	sc_err_t err = 0;
 
-	/* Power up UART1 */
-	err = sc_pm_set_resource_power_mode(-1, SC_R_UART_1, SC_PM_PW_MODE_ON);
-	if (err != SC_ERR_NONE)
-		return 0;
-
-	/* Set UART3 clock root to 80 MHz */
-	rate = 80000000;
-	err = sc_pm_set_clock_rate(-1, SC_R_UART_1, SC_PM_CLK_PER, &rate);
-	if (err != SC_ERR_NONE)
-		return 0;
-
-	/* Enable UART1 clock root */
-	err = sc_pm_clock_enable(-1, SC_R_UART_1, SC_PM_CLK_PER, true, false);
+	/* Set UART1 clock root to 80 MHz and enable it */
+	err = sc_pm_setup_uart(SC_R_UART_1, rate);
 	if (err != SC_ERR_NONE)
 		return 0;
 

board/toradex/colibri-imx8x/colibri-imx8x.c

@@ -51,19 +51,9 @@ int board_early_init_f(void)
 	if (err != SC_ERR_NONE)
 		return 0;
 
-	/* Power up UART3 */
-	err = sc_pm_set_resource_power_mode(-1, SC_R_UART_3, SC_PM_PW_MODE_ON);
-	if (err != SC_ERR_NONE)
-		return 0;
-
-	/* Set UART3 clock root to 80 MHz */
-	rate = 80000000;
-	err = sc_pm_set_clock_rate(-1, SC_R_UART_3, SC_PM_CLK_PER, &rate);
-	if (err != SC_ERR_NONE)
-		return 0;
-
-	/* Enable UART3 clock root */
-	err = sc_pm_clock_enable(-1, SC_R_UART_3, SC_PM_CLK_PER, true, false);
+	/* Set UART3 clock root to 80 MHz and enable it */
+	rate = SC_80MHZ;
+	err = sc_pm_setup_uart(SC_R_UART_3, rate);
 	if (err != SC_ERR_NONE)
 		return 0;