openwrtv3/target/linux/brcm2708/patches-4.1/0071-bcm2835-audio-Create-the-platform-device-if-the-DT-n.patch

From fbe18b3fca27d4cce0aa721c9fa09bb40dbdd873 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Wed, 27 May 2015 17:22:15 +0100
Subject: [PATCH 071/222] bcm2835-audio: Create the platform device if the DT
 node is disabled

For backwards compatibility, allow the built-in ALSA driver to be enabled
either by loading the module from /etc/modules or by enabling the "/audio"
node in DT.
---
 arch/arm/mach-bcm2708/bcm2708.c | 10 ++++++++--
 arch/arm/mach-bcm2709/bcm2709.c | 10 ++++++++--
 2 files changed, 16 insertions(+), 4 deletions(-)

--- a/arch/arm/mach-bcm2708/bcm2708.c
+++ b/arch/arm/mach-bcm2708/bcm2708.c
@@ -898,8 +898,14 @@ void __init bcm2708_init(void)
 #endif
 	bcm2708_init_led();
 	bcm2708_init_uart1();
-	for (i = 0; i < ARRAY_SIZE(bcm2708_alsa_devices); i++)
-		bcm_register_device_dt(&bcm2708_alsa_devices[i]);
+
+	/* Only create the platform devices for the ALSA driver in the
+	   absence of an enabled "audio" DT node */
+	if (!use_dt ||
+	    !of_device_is_available(of_find_node_by_path("/audio"))) {
+		for (i = 0; i < ARRAY_SIZE(bcm2708_alsa_devices); i++)
+			bcm_register_device(&bcm2708_alsa_devices[i]);
+	}
 
 	bcm_register_device_dt(&bcm2708_spi_device);
 
--- a/arch/arm/mach-bcm2709/bcm2709.c
+++ b/arch/arm/mach-bcm2709/bcm2709.c
@@ -918,8 +918,14 @@ void __init bcm2709_init(void)
 #endif
 	bcm2709_init_led();
 	bcm2709_init_uart1();
-	for (i = 0; i < ARRAY_SIZE(bcm2708_alsa_devices); i++)
-		bcm_register_device_dt(&bcm2708_alsa_devices[i]);
+
+	/* Only create the platform devices for the ALSA driver in the
+	   absence of an enabled "audio" DT node */
+	if (!use_dt ||
+	    !of_device_is_available(of_find_node_by_path("/audio"))) {
+		for (i = 0; i < ARRAY_SIZE(bcm2708_alsa_devices); i++)
+			bcm_register_device(&bcm2708_alsa_devices[i]);
+	}
 
 	bcm_register_device_dt(&bcm2708_spi_device);