linux-kernel - [PATCH 04/12] platform: provide a separate function for initializing platform devices

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Date:   Fri, 11 May 2018 18:20:20 +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>,
        Mark Rutland <mark.rutland@....com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Marc Zyngier <marc.zyngier@....com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Peter Rosin <peda@...ntia.se>, Jiri Slaby <jslaby@...e.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Magnus Damm <magnus.damm@...il.com>,
        Johan Hovold <johan@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arch@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH 04/12] platform: provide a separate function for initializing platform devices

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

The early platform driver framework will allocate platform devices
using its own internal mechanisms. Provide a function that allows to
initialize a platform device object without allocating it.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
---
 drivers/base/platform.c         | 24 ++++++++++++++++++++----
 include/linux/platform_device.h |  2 ++
 2 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 0c53e3e3e5aa..0ba4effb9618 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -252,6 +252,25 @@ static void platform_device_release(struct device *dev)
 	kfree(pa);
 }
 
+/**
+ * platform_device_init - initialize a platform device
+ * @pdev: platform device to initialize
+ * @name: base name of the device we're adding, NOTE: it's not copied
+ * @id: instance id
+ *
+ * Initiate an already allocated platform device. This routine does not set
+ * the release device callback.
+ */
+void platform_device_init(struct platform_device *pdev,
+			  const char *name, int id)
+{
+	pdev->name = name;
+	pdev->id = id;
+	device_initialize(&pdev->dev);
+	arch_setup_pdev_archdata(pdev);
+}
+EXPORT_SYMBOL_GPL(platform_device_init);
+
 /**
  * platform_device_alloc - create a platform device
  * @name: base name of the device we're adding
@@ -267,11 +286,8 @@ struct platform_device *platform_device_alloc(const char *name, int id)
 	pa = kzalloc(sizeof(*pa) + strlen(name) + 1, GFP_KERNEL);
 	if (pa) {
 		strcpy(pa->name, name);
-		pa->pdev.name = pa->name;
-		pa->pdev.id = id;
-		device_initialize(&pa->pdev.dev);
+		platform_device_init(&pa->pdev, pa->name, id);
 		pa->pdev.dev.release = platform_device_release;
-		arch_setup_pdev_archdata(&pa->pdev);
 	}
 
 	return pa ? &pa->pdev : NULL;
diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index 099aaf804b50..46bfd5ff666f 100644
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -165,6 +165,8 @@ static inline struct platform_device *platform_device_register_data(
 			NULL, 0, data, size);
 }
 
+extern void platform_device_init(struct platform_device *pdev,
+				 const char *name, int id);
 extern struct platform_device *platform_device_alloc(const char *name, int id);
 extern int platform_device_add_resources(struct platform_device *pdev,
 					 const struct resource *res,
-- 
2.17.0