[Skiboot] [PATCH v2 2/2] FSP/EPOW: Add device tree entries to export EPOW event timeouts

[Vipin K Parashar]

This patch adds device tree entries to export timeout values for
various EPOW events. A separate node is created for each EPOW class
under EPOW device tree node. Under each EPOW class, property files
are created containing timeout values for various EPOW events for
that class. Timeout values are reported in seconds.
	Host kernel should parse these device tree entries under
EPOW node to know various EPOW event timeout values on various
platforms. Entries under EPOW device tree node look as below:

epow
├── compatible
├── epow-classes
├── linux,phandle
├── name
├── phandle
├── power
│   ├── linux,phandle
│   ├── name
│   ├── phandle
│   ├── ups-low-timeout
│   └── ups-timeout
└── temp
    ├── crit-ambient-temp-timeout
    ├── crit-internal-temp-timeout
    ├── high-ambient-temp-timeout
    ├── high-internal-temp-timeout
    ├── linux,phandle
    ├── name
    └── phandle

Signed-off-by: Vipin K Parashar <vipin at linux.vnet.ibm.com>
---
 hw/fsp/fsp-epow.c | 62 +++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 49 insertions(+), 13 deletions(-)

diff --git a/hw/fsp/fsp-epow.c b/hw/fsp/fsp-epow.c
index 97b082a..1ecb6fc 100644
--- a/hw/fsp/fsp-epow.c
+++ b/hw/fsp/fsp-epow.c
@@ -273,31 +273,67 @@ static bool fsp_epow_message(u32 cmd_sub_mod, struct fsp_msg *msg)
 	return false;
 }
 
+/* Create EPOW device tree */
+static void create_epow_dt_entries(void)
+{
+	struct dt_node *node_epow;
+	struct dt_node *node_epow_power, *node_epow_temp;
+
+	/* Create EPOW node */
+	node_epow = dt_new(opal_node, "epow");
+	if (!node_epow) {
+		prerror(PREFIX "Failed to create epow device tree node\n");
+		return;
+	}
+
+	/* Add EPOW node properties */
+	dt_add_property_strings(node_epow, "compatible", "ibm,opal-epow");
+	dt_add_property_strings(node_epow, "epow-classes", "power",
+			"temp", "cooling");
+
+	/*
+	* Create EPOW child nodes and associated property entries
+	*
+	* Power EPOW properties
+	*/
+	node_epow_power = dt_new(node_epow, "power");
+	if (node_epow_power) {
+		dt_add_property_cells(node_epow_power,
+		"ups-timeout", TIMEOUT_EPOW_POWER_UPS);
+		dt_add_property_cells(node_epow_power,
+		"ups-low-timeout", TIMEOUT_EPOW_POWER_UPS_LOW);
+	} else
+		prerror(PREFIX "Failed to create epow/power dt node\n");
+
+	/* Temperature EPOW propeties */
+	node_epow_temp = dt_new(node_epow, "temp");
+	if (node_epow_temp) {
+		dt_add_property_cells(node_epow_temp,
+		"high-ambient-temp-timeout", TIMEOUT_EPOW_TEMP_HIGH_AMB);
+		dt_add_property_cells(node_epow_temp,
+		"crit-ambient-temp-timeout", TIMEOUT_EPOW_TEMP_CRIT_AMB);
+		dt_add_property_cells(node_epow_temp,
+		"high-internal-temp-timeout", TIMEOUT_EPOW_TEMP_HIGH_INT);
+		dt_add_property_cells(node_epow_temp,
+		"crit-internal-temp-timeout", TIMEOUT_EPOW_TEMP_CRIT_INT);
+	} else
+		prerror(PREFIX "Failed to create epow/temp dt node\n");
+}
+
 static struct fsp_client fsp_epow_client = {
 	.message = fsp_epow_message,
 };
 
 void fsp_epow_init(void)
 {
-	struct dt_node *node_epow;
-
 	/* Register FSP EPOW notifications */
 	fsp_register_client(&fsp_epow_client, FSP_MCLASS_SERVICE);
 
 	/* Register host OPAL EPOW interface */
 	opal_register(OPAL_GET_EPOW_STATUS, opal_get_epow_status, 2);
 
-	/* Create EPOW device tree node */
-	node_epow = dt_new(opal_node, "epow");
-	if (!node_epow) {
-		prerror(PREFIX "Failed to create epow device tree node\n");
-		return;
-	}
-
-	/* Add EPOW node properties */
-	dt_add_property_strings(node_epow, "compatible", "ibm,opal-epow");
-	dt_add_property_strings(node_epow, "epow-classes", "power", "temp",
-					"cooling");
+	/* Create device tree entries for EPOW */
+	create_epow_dt_entries();
 
 	prlog(PR_INFO, PREFIX "FSP EPOW support initialized\n");
 }
-- 
1.9.3