RE: [PATCH v6 3/3] soc: fsl: add RCPM driver

The NXP's QorIQ Processors based on ARM Core have RCPM module (Run
Control and Power Management), which performs system level tasks associated
with power management such as wakeup source control.

This driver depends on PM wakeup source framework which help to collect wake
information.

Signed-off-by: Ran Wang <redacted>
---
Change in v6:
	- Adjust related API usage to meet wakeup.c's update in patch 1/3.
Change in v5:
	- Fix v4 regression of the return value of wakeup_source_get_next()
	didn't pass to ws in while loop.
	- Rename wakeup_source member 'attached_dev' to 'dev'.
	- Rename property 'fsl,#rcpm-wakeup-cells' to '#fsl,rcpm-wakeup-cells'.
	please see
https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.kern
el.org%2Fpatchwork%2Fpatch%2F1101022%2F&amp;data=02%7C01%7Cran.wa
ng_1%40nxp.com%7C27cff523c0a54ce89afe08d725e5987b%7C686ea1d3bc2b4
c6fa92cd99c5c301635%7C0%7C0%7C637019540358555022&amp;sdata=4YYGD
lwvB%2B4Y1436c1bOUzFyjYEqTU5HbiUFv5%2FCxi0%3D&amp;reserved=0

Change in v4:
	- Remove extra ',' in author line of rcpm.c
	- Update usage of wakeup_source_get_next() to be less confusing to
the reader, code logic remain the same.

Change in v3:
	- Some whitespace ajdustment.

Change in v2:
	- Rebase Kconfig and Makefile update to latest mainline.

 drivers/soc/fsl/Kconfig  |   8 +++
 drivers/soc/fsl/Makefile |   2 +
 drivers/soc/fsl/rcpm.c   | 128
+++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 138 insertions(+)
 create mode 100644 drivers/soc/fsl/rcpm.c

diff --git a/drivers/soc/fsl/Kconfig b/drivers/soc/fsl/Kconfig index

f9ad8ad..4918856 100644

--- a/drivers/soc/fsl/Kconfig
+++ b/drivers/soc/fsl/Kconfig

@@ -40,4 +40,12 @@ config DPAA2_CONSOLE
 	  /dev/dpaa2_mc_console and /dev/dpaa2_aiop_console,
 	  which can be used to dump the Management Complex and AIOP
 	  firmware logs.
+
+config FSL_RCPM
+	bool "Freescale RCPM support"
+	depends on PM_SLEEP
+	help
+	  The NXP QorIQ Processors based on ARM Core have RCPM module
+	  (Run Control and Power Management), which performs all device-level
+	  tasks associated with power management, such as wakeup source

control.
 endmenu

diff --git a/drivers/soc/fsl/Makefile b/drivers/soc/fsl/Makefile index

71dee8d..28c6dac 100644

--- a/drivers/soc/fsl/Makefile
+++ b/drivers/soc/fsl/Makefile

@@ -6,6 +6,8 @@
 obj-$(CONFIG_FSL_DPAA)                 += qbman/
 obj-$(CONFIG_QUICC_ENGINE)		+= qe/
 obj-$(CONFIG_CPM)			+= qe/
+obj-$(CONFIG_FSL_RCPM)			+= rcpm.o
 obj-$(CONFIG_FSL_GUTS)			+= guts.o
 obj-$(CONFIG_FSL_MC_DPIO) 		+= dpio/
 obj-$(CONFIG_DPAA2_CONSOLE)		+= dpaa2-console.o
+obj-y += ftm_alarm.o

diff --git a/drivers/soc/fsl/rcpm.c b/drivers/soc/fsl/rcpm.c new file mode

100644 index 0000000..82c0ad5

--- /dev/null
+++ b/drivers/soc/fsl/rcpm.c

@@ -0,0 +1,128 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// rcpm.c - Freescale QorIQ RCPM driver // // Copyright 2019 NXP // //
+Author: Ran Wang <ran.wang_1@nxp.com>
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of_address.h>
+#include <linux/slab.h>
+#include <linux/suspend.h>
+#include <linux/kernel.h>
+
+#define RCPM_WAKEUP_CELL_MAX_SIZE	7
+
+struct rcpm {
+	unsigned int	wakeup_cells;
+	void __iomem	*ippdexpcr_base;
+	bool		little_endian;
+};
+
+static int rcpm_pm_prepare(struct device *dev) {
+	struct device_node	*np = dev->of_node;
+	struct wakeup_source	*ws;
+	struct rcpm		*rcpm;
+	u32 value[RCPM_WAKEUP_CELL_MAX_SIZE + 1], tmp;
+	int i, ret, idx;
+
+	rcpm = dev_get_drvdata(dev);
+	if (!rcpm)
+		return -EINVAL;
+
+	/* Begin with first registered wakeup source */
+	ws = wakeup_source_get_start(&idx);