brcm2708: add linux 4.4 support

- random-bcm2708 and spi-bcm2708 have been removed.
- sound-soc-bcm2708-i2s has been upstreamed as sound-soc-bcm2835-i2s.

Let's keep linux 4.1 for a while, since linux 4.4 appears to have some issues
with multicast traffic on RPi ethernet:
https://gist.github.com/Noltari/5b1cfdecce5ed4bc08fd

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

SVN-Revision: 48266

1 files changed, 63 insertions, 0 deletions

diff --git a/target/linux/brcm2708/patches-4.4/0018-bcm2835-i2s-Register-PCM-device.patch b/target/linux/brcm2708/patches-4.4/0018-bcm2835-i2s-Register-PCM-device.patch
new file mode 100644
index 0000000000..eeb7d61b5d
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.4/0018-bcm2835-i2s-Register-PCM-device.patch
@@ -0,0 +1,63 @@
+From b58d4ef09eca4674d1530f0c8e1ca074b269ebea Mon Sep 17 00:00:00 2001
+From: Matthias Reichl <hias@horus.com>
+Date: Sun, 11 Oct 2015 15:35:20 +0200
+Subject: [PATCH 018/127] bcm2835-i2s: Register PCM device
+
+Code ported from bcm2708-i2s driver in Raspberry Pi tree.
+
+RPi commit ba46b4935a23aa2caac1855ead52a035d4776680 ("ASoC: Add
+support for BCM2708")
+
+This driver adds support for digital audio (I2S)
+for the BCM2708 SoC that is used by the
+Raspberry Pi. External audio codecs can be
+connected to the Raspberry Pi via P5 header.
+
+It relies on cyclic DMA engine support for BCM2708.
+
+Signed-off-by: Florian Meier <florian.meier@koalo.de>
+
+Signed-off-by: Matthias Reichl <hias@horus.com>
+---
+ sound/soc/bcm/bcm2835-i2s.c | 23 ++++++++++++++++++++++-
+ 1 file changed, 22 insertions(+), 1 deletion(-)
+
+--- a/sound/soc/bcm/bcm2835-i2s.c
++++ b/sound/soc/bcm/bcm2835-i2s.c
+@@ -799,6 +799,25 @@ static const struct snd_soc_component_dr
+ 	.name		= "bcm2835-i2s-comp",
+ };
+ 
++static const struct snd_pcm_hardware bcm2835_pcm_hardware = {
++	.info			= SNDRV_PCM_INFO_INTERLEAVED |
++				  SNDRV_PCM_INFO_JOINT_DUPLEX,
++	.formats		= SNDRV_PCM_FMTBIT_S16_LE |
++				  SNDRV_PCM_FMTBIT_S24_LE |
++				  SNDRV_PCM_FMTBIT_S32_LE,
++	.period_bytes_min	= 32,
++	.period_bytes_max	= 64 * PAGE_SIZE,
++	.periods_min		= 2,
++	.periods_max		= 255,
++	.buffer_bytes_max	= 128 * PAGE_SIZE,
++};
++
++static const struct snd_dmaengine_pcm_config bcm2835_dmaengine_pcm_config = {
++	.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
++	.pcm_hardware = &bcm2835_pcm_hardware,
++	.prealloc_buffer_size = 256 * PAGE_SIZE,
++};
++
+ static int bcm2835_i2s_probe(struct platform_device *pdev)
+ {
+ 	struct bcm2835_i2s_dev *dev;
+@@ -870,7 +889,9 @@ static int bcm2835_i2s_probe(struct plat
+ 		return ret;
+ 	}
+ 
+-	ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
++	ret = devm_snd_dmaengine_pcm_register(&pdev->dev,
++			&bcm2835_dmaengine_pcm_config,
++			SND_DMAENGINE_PCM_FLAG_COMPAT);
+ 	if (ret) {
+ 		dev_err(&pdev->dev, "Could not register PCM: %d\n", ret);
+ 		return ret;