[PATCH v5] soc: fsl: enable acpi support in RCPM driver

[Ran Wang]

From: Peng Ma <peng.ma at nxp.com>

This patch enables ACPI support in RCPM driver.

Signed-off-by: Peng Ma <peng.ma at nxp.com>
Signed-off-by: Ran Wang <ran.wang_1 at nxp.com>
---
Change in v5:
 - Fix panic when dev->of_node is null

Change in v4:
 - Make commit subject more accurate
 - Remove unrelated new blank line

Change in v3:
 - Add #ifdef CONFIG_ACPI for acpi_device_id
 - Rename rcpm_acpi_imx_ids to rcpm_acpi_ids

Change in v2:
 - Update acpi_device_id to fix conflict with other driver

 drivers/soc/fsl/rcpm.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/drivers/soc/fsl/rcpm.c b/drivers/soc/fsl/rcpm.c
index a093dbe..58870f4 100644
--- a/drivers/soc/fsl/rcpm.c
+++ b/drivers/soc/fsl/rcpm.c
@@ -2,7 +2,7 @@
 //
 // rcpm.c - Freescale QorIQ RCPM driver
 //
-// Copyright 2019 NXP
+// Copyright 2019-2020 NXP
 //
 // Author: Ran Wang <ran.wang_1 at nxp.com>
 
@@ -13,6 +13,7 @@
 #include <linux/slab.h>
 #include <linux/suspend.h>
 #include <linux/kernel.h>
+#include <linux/acpi.h>
 
 #define RCPM_WAKEUP_CELL_MAX_SIZE	7
 
@@ -56,10 +57,14 @@ static int rcpm_pm_prepare(struct device *dev)
 				"fsl,rcpm-wakeup", value,
 				rcpm->wakeup_cells + 1);
 
-		/*  Wakeup source should refer to current rcpm device */
-		if (ret || (np->phandle != value[0]))
+		if (ret)
 			continue;
 
+		if (is_of_node(dev->fwnode))
+			/*  Should refer to current rcpm device */
+			if (np->phandle != value[0])
+				continue;
+
 		/* Property "#fsl,rcpm-wakeup-cells" of rcpm node defines the
 		 * number of IPPDEXPCR register cells, and "fsl,rcpm-wakeup"
 		 * of wakeup source IP contains an integer array: <phandle to
@@ -139,10 +144,19 @@ static const struct of_device_id rcpm_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, rcpm_of_match);
 
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id rcpm_acpi_ids[] = {
+	{"NXP0015",},
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, rcpm_acpi_ids);
+#endif
+
 static struct platform_driver rcpm_driver = {
 	.driver = {
 		.name = "rcpm",
 		.of_match_table = rcpm_of_match,
+		.acpi_match_table = ACPI_PTR(rcpm_acpi_ids),
 		.pm	= &rcpm_pm_ops,
 	},
 	.probe = rcpm_probe,
-- 
2.7.4