[PATCH] ARM: mx25: Add basic suspend/resume support
From: festevam@gmail.com (Fabio Estevam)
Date: 2016-02-02 21:18:06
From: Fabio Estevam <redacted> Tested basic suspend/resume on a mx25pdk: $ echo enabled > /sys/class/tty/ttymxc0/power/wakeup $ echo mem > /sys/power/state Then press any key in the serial console and the system wakes up. Signed-off-by: Fabio Estevam <redacted> --- arch/arm/mach-imx/Makefile | 2 +- arch/arm/mach-imx/common.h | 1 + arch/arm/mach-imx/mach-imx25.c | 1 + arch/arm/mach-imx/pm-imx25.c | 41 +++++++++++++++++++++++++++++++++++++++++ 4 files changed, 44 insertions(+), 1 deletion(-) create mode 100644 arch/arm/mach-imx/pm-imx25.c
diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
index fb689d8..9fbe624 100644
--- a/arch/arm/mach-imx/Makefile
+++ b/arch/arm/mach-imx/Makefile@@ -3,7 +3,7 @@ obj-y := cpu.o system.o irq-common.o obj-$(CONFIG_SOC_IMX1) += mm-imx1.o obj-$(CONFIG_SOC_IMX21) += mm-imx21.o -obj-$(CONFIG_SOC_IMX25) += cpu-imx25.o mach-imx25.o +obj-$(CONFIG_SOC_IMX25) += cpu-imx25.o mach-imx25.o pm-imx25.o obj-$(CONFIG_SOC_IMX27) += cpu-imx27.o pm-imx27.o obj-$(CONFIG_SOC_IMX27) += mm-imx27.o ehci-imx27.o
diff --git a/arch/arm/mach-imx/common.h b/arch/arm/mach-imx/common.h
index 32b83f0..58a3846 100644
--- a/arch/arm/mach-imx/common.h
+++ b/arch/arm/mach-imx/common.h@@ -66,6 +66,7 @@ void imx_gpc_check_dt(void); void imx_gpc_set_arm_power_in_lpm(bool power_off); void imx_gpc_set_arm_power_up_timing(u32 sw2iso, u32 sw); void imx_gpc_set_arm_power_down_timing(u32 sw2iso, u32 sw); +void imx25_pm_init(void); enum mxc_cpu_pwr_mode { WAIT_CLOCKED, /* wfi only */
diff --git a/arch/arm/mach-imx/mach-imx25.c b/arch/arm/mach-imx/mach-imx25.c
index 9379fd0..32dcb5e 100644
--- a/arch/arm/mach-imx/mach-imx25.c
+++ b/arch/arm/mach-imx/mach-imx25.c@@ -41,6 +41,7 @@ static const char * const imx25_dt_board_compat[] __initconst = { DT_MACHINE_START(IMX25_DT, "Freescale i.MX25 (Device Tree Support)") .init_early = imx25_init_early, + .init_late = imx25_pm_init, .init_irq = mx25_init_irq, .dt_compat = imx25_dt_board_compat, MACHINE_END
diff --git a/arch/arm/mach-imx/pm-imx25.c b/arch/arm/mach-imx/pm-imx25.c
new file mode 100644
index 0000000..cd27c4c
--- /dev/null
+++ b/arch/arm/mach-imx/pm-imx25.c@@ -0,0 +1,41 @@ +/* + * Copyright 2016 NXP Semiconductors + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/kernel.h> +#include <linux/suspend.h> +#include <linux/io.h> + +#ifdef CONFIG_PM +static int imx25_suspend_enter(suspend_state_t state) +{ + switch (state) { + case PM_SUSPEND_MEM: + cpu_do_idle(); + break; + default: + return -EINVAL; + } + + return 0; +} +#else +static inline int imx25_suspend_enter(suspend_state_t state) +{ + return 0; +} +#endif + +static const struct platform_suspend_ops imx25_suspend_ops = { + .enter = imx25_suspend_enter, + .valid = suspend_valid_only_mem, +}; + +void __init imx25_pm_init(void) +{ + suspend_set_ops(&imx25_suspend_ops); +}
--
1.9.1