linux-kernel - [PATCH 10/11] of: platform: provide of_early_platform

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Date:   Tue, 24 Apr 2018 19:30:50 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Sekhar Nori <nsekhar@...com>, Kevin Hilman <khilman@...nel.org>,
        David Lechner <david@...hnology.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Frank Rowand <frowand.list@...il.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Arend van Spriel <aspriel@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Michal Suchanek <msuchanek@...e.de>,
        Jan Kiszka <jan.kiszka@...mens.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH 10/11] of: platform: provide of_early_platform_probe()

From: Bartosz Golaszewski <bgolaszewski@...libre.com>

Implement a function that must be called from machine code early in
the bo process in order to probe all registered early devices.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
---
 drivers/of/platform.c       | 12 ++++++++++++
 include/linux/of_platform.h |  2 ++
 2 files changed, 14 insertions(+)

diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index 4b55e568fe77..525a466b03d1 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -541,6 +541,18 @@ int of_early_platform_populate(struct device_node *root,
 	return rc;
 }
 EXPORT_SYMBOL_GPL(of_early_platform_populate);
+
+/**
+ * of_early_platform_probe() - Probe all registered early platform devices.
+ *
+ * Returns 0 on success, a negative error code on failure.
+ */
+int of_early_platform_probe(void)
+{
+	return early_platform_driver_register_probe_all(
+				EARLY_PLATFORM_DEFAULT_CLASS, INT_MAX, 0);
+}
+EXPORT_SYMBOL_GPL(of_early_platform_probe);
 #endif /* CONFIG_EARLY_PLATFORM_DEVICES */
 
 int of_platform_default_populate(struct device_node *root,
diff --git a/include/linux/of_platform.h b/include/linux/of_platform.h
index 2bf1013a3e89..caa08e3bf3b7 100644
--- a/include/linux/of_platform.h
+++ b/include/linux/of_platform.h
@@ -81,6 +81,7 @@ extern int of_early_platform_populate(struct device_node *root,
 				      const struct of_device_id *matches,
 				      const struct of_dev_auxdata *lookup,
 				      struct device *parent);
+extern int of_early_platform_probe(void);
 #else /* CONFIG_EARLY_PLATFORM_DEVICES */
 static inline int
 of_early_platform_populate(struct device_node *root,
@@ -90,6 +91,7 @@ of_early_platform_populate(struct device_node *root,
 {
 	return -ENOSYS;
 }
+static inline void int of_early_platform_probe(void) {}
 #endif /* CONFIG_EARLY_PLATFORM_DEVICES */
 
 extern int of_platform_default_populate(struct device_node *root,
-- 
2.17.0