linux-kernel - [RFC v1 3/4] regulator: core: Probe regulator devices

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Message-Id: <20230218083252.2044423-4-saravanak@google.com>
Date:   Sat, 18 Feb 2023 00:32:50 -0800
From:   Saravana Kannan <saravanak@...gle.com>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     Saravana Kannan <saravanak@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Tony Lindgren <tony@...mide.com>,
        Doug Anderson <dianders@...omium.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Luca Weiss <luca.weiss@...rphone.com>, kernel-team@...roid.com,
        linux-kernel@...r.kernel.org
Subject: [RFC v1 3/4] regulator: core: Probe regulator devices

Since devices added to a bus can be probed, add a stub probe function
for regulator devices.

Signed-off-by: Saravana Kannan <saravanak@...gle.com>
---
 drivers/regulator/core.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index b6700d50d230..d5f9fdd79c14 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -5780,6 +5780,17 @@ static const struct dev_pm_ops __maybe_unused regulator_pm_ops = {
 };
 #endif
 
+static int regulator_drv_probe(struct device *dev)
+{
+	return 0;
+}
+
+static struct device_driver regulator_drv = {
+	.name = "regulator_drv",
+	.bus = &regulator_bus,
+	.probe = regulator_drv_probe,
+};
+
 struct bus_type regulator_bus = {
 	.name = "regulator",
 	.remove = regulator_dev_release,
@@ -6123,6 +6134,10 @@ static int __init regulator_init(void)
 	if (ret)
 		goto unreg_compat;
 
+	ret = driver_register(&regulator_drv);
+	if (ret)
+		goto unreg_bus;
+
 	debugfs_root = debugfs_create_dir("regulator", NULL);
 	if (!debugfs_root)
 		pr_warn("regulator: Failed to create debugfs directory\n");
@@ -6141,6 +6156,8 @@ static int __init regulator_init(void)
 
 	return ret;
 
+unreg_bus:
+	bus_unregister(&regulator_bus);
 unreg_compat:
 	class_compat_unregister(regulator_compat_class);
 	return ret;
-- 
2.39.2.637.g21b0678d19-goog