linux-kernel - [PATCH v2 3/3] hwmon: (occ) Check for device property for setting OCC active during probe

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Date:   Tue,  9 Aug 2022 15:07:01 -0500
From:   Eddie James <eajames@...ux.ibm.com>
To:     joel@....id.au
Cc:     jdelvare@...e.com, robh+dt@...nel.org, linux@...ck-us.net,
        krzysztof.kozlowski+dt@...aro.org, linux-hwmon@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fsi@...ts.ozlabs.org, Eddie James <eajames@...ux.ibm.com>
Subject: [PATCH v2 3/3] hwmon: (occ) Check for device property for setting OCC active during probe

A previous commit changed the existing behavior of the driver to skip
attempting to communicate with the OCC during probe. Return to the
previous default behavior of automatically communicating with the OCC
and make it optional with a new device-tree property.

Signed-off-by: Eddie James <eajames@...ux.ibm.com>
---
 drivers/hwmon/occ/common.c | 11 ++++++++++-
 drivers/hwmon/occ/p9_sbe.c |  9 +++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/occ/common.c b/drivers/hwmon/occ/common.c
index 45407b12db4b..dd690f700d49 100644
--- a/drivers/hwmon/occ/common.c
+++ b/drivers/hwmon/occ/common.c
@@ -10,6 +10,7 @@
 #include <linux/math64.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
+#include <linux/property.h>
 #include <linux/sysfs.h>
 #include <asm/unaligned.h>
 
@@ -1216,8 +1217,16 @@ int occ_setup(struct occ *occ)
 	occ->groups[0] = &occ->group;
 
 	rc = occ_setup_sysfs(occ);
-	if (rc)
+	if (rc) {
 		dev_err(occ->bus_dev, "failed to setup sysfs: %d\n", rc);
+		return rc;
+	}
+
+	if (!device_property_read_bool(occ->bus_dev, "ibm,no-poll-on-init")) {
+		rc = occ_active(occ, true);
+		if (rc)
+			occ_shutdown_sysfs(occ);
+	}
 
 	return rc;
 }
diff --git a/drivers/hwmon/occ/p9_sbe.c b/drivers/hwmon/occ/p9_sbe.c
index 4a1fe4ee8e2c..3adcf8d0b4a6 100644
--- a/drivers/hwmon/occ/p9_sbe.c
+++ b/drivers/hwmon/occ/p9_sbe.c
@@ -7,6 +7,7 @@
 #include <linux/fsi-occ.h>
 #include <linux/mm.h>
 #include <linux/module.h>
+#include <linux/mod_devicetable.h>
 #include <linux/mutex.h>
 #include <linux/platform_device.h>
 #include <linux/string.h>
@@ -179,9 +180,17 @@ static int p9_sbe_occ_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct of_device_id p9_sbe_occ_of_match[] = {
+	{ .compatible = "ibm,p9-occ-hwmon" },
+	{ .compatible = "ibm,p10-occ-hwmon" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, p9_sbe_occ_of_match);
+
 static struct platform_driver p9_sbe_occ_driver = {
 	.driver = {
 		.name = "occ-hwmon",
+		.of_match_table = p9_sbe_occ_of_match,
 	},
 	.probe	= p9_sbe_occ_probe,
 	.remove = p9_sbe_occ_remove,
-- 
2.31.1