Openwrt/target/linux/brcm2708/patches-3.18/0100-HiFiBerry-Amp-fix-device-tree-problems.patch

From 115f744544291c3529868e72f101df652b156e56 Mon Sep 17 00:00:00 2001
From: Daniel Matuschek <daniel@hifiberry.com>
Date: Tue, 3 Feb 2015 07:15:19 +0100
Subject: [PATCH 100/114] HiFiBerry Amp: fix device-tree problems

Some code to load the driver based on device-tree-overlays was missing. This is added by this patch.
---
 sound/soc/bcm/hifiberry_amp.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

--- a/sound/soc/bcm/hifiberry_amp.c
+++ b/sound/soc/bcm/hifiberry_amp.c
@@ -65,6 +65,12 @@ static struct snd_soc_card snd_rpi_hifib
 	.num_links    = ARRAY_SIZE(snd_rpi_hifiberry_amp_dai),
 };
 
+static const struct of_device_id snd_rpi_hifiberry_amp_of_match[] = {
+        { .compatible = "hifiberry,hifiberry-amp", },
+        {},
+};
+MODULE_DEVICE_TABLE(of, snd_rpi_hifiberry_amp_of_match);
+
 
 static int snd_rpi_hifiberry_amp_probe(struct platform_device *pdev)
 {
@@ -72,6 +78,20 @@ static int snd_rpi_hifiberry_amp_probe(s
 
 	snd_rpi_hifiberry_amp.dev = &pdev->dev;
 
+        if (pdev->dev.of_node) {
+            struct device_node *i2s_node;
+            struct snd_soc_dai_link *dai = &snd_rpi_hifiberry_amp_dai[0];
+            i2s_node = of_parse_phandle(pdev->dev.of_node,
+                                        "i2s-controller", 0);
+
+            if (i2s_node) {
+                dai->cpu_dai_name = NULL;
+                dai->cpu_of_node = i2s_node;
+                dai->platform_name = NULL;
+                dai->platform_of_node = i2s_node;
+            }
+        }
+
 	ret = snd_soc_register_card(&snd_rpi_hifiberry_amp);
 
 	if (ret != 0) {
@@ -92,6 +112,7 @@ static struct platform_driver snd_rpi_hi
         .driver = {
                 .name   = "snd-hifiberry-amp",
                 .owner  = THIS_MODULE,
+		.of_match_table = snd_rpi_hifiberry_amp_of_match,
         },
         .probe          = snd_rpi_hifiberry_amp_probe,
         .remove         = snd_rpi_hifiberry_amp_remove,