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, 79 insertions, 0 deletions

diff --git a/target/linux/brcm2708/patches-4.4/0015-bcm2835-i2s-add-24bit-support-update-bclk_ratio-to-m.patch b/target/linux/brcm2708/patches-4.4/0015-bcm2835-i2s-add-24bit-support-update-bclk_ratio-to-m.patch
new file mode 100644
index 0000000..b627327
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.4/0015-bcm2835-i2s-add-24bit-support-update-bclk_ratio-to-m.patch
@@ -0,0 +1,79 @@
+From 328b2e8b8a38fe62431c2ad5ae22cee31740b10d Mon Sep 17 00:00:00 2001
+From: Matthias Reichl <hias@horus.com>
+Date: Sun, 11 Oct 2015 15:21:16 +0200
+Subject: [PATCH 015/127] bcm2835-i2s: add 24bit support, update bclk_ratio to
+ more correct values
+
+Code ported from bcm2708-i2s driver in Raspberry Pi tree.
+
+RPi commit 62c05a0b5328d9376d39c9e74da10b8a2465c234 ("ASoC: BCM2708:
+Add 24 bit support")
+
+This adds 24 bit support to the I2S driver of the BCM2708.
+Besides enabling the 24 bit flags, it includes two bug fixes:
+
+MMAP is not supported. Claiming this leads to strange issues
+when the format of driver and file do not match.
+
+The datasheet states that the width extension bit should be set
+for widths greater than 24, but greater or equal would be correct.
+This follows from the definition of the width field.
+
+Signed-off-by: Florian Meier <florian.meier@koalo.de>
+
+RPi commit 3e8c672bc4e92d457aa4654bbb4cfd79a18a2327 ("bcm2708-i2s:
+Update bclk_ratio to more correct values")
+
+Discussion about blck_ratio affecting sound quality:
+https://github.com/raspberrypi/linux/issues/681
+
+Signed-off-by: Matthias Reichl <hias@horus.com>
+---
+ sound/soc/bcm/bcm2835-i2s.c | 12 +++++++++---
+ 1 file changed, 9 insertions(+), 3 deletions(-)
+
+--- a/sound/soc/bcm/bcm2835-i2s.c
++++ b/sound/soc/bcm/bcm2835-i2s.c
+@@ -340,11 +340,15 @@ static int bcm2835_i2s_hw_params(struct
+ 	switch (params_format(params)) {
+ 	case SNDRV_PCM_FORMAT_S16_LE:
+ 		data_length = 16;
+-		bclk_ratio = 40;
++		bclk_ratio = 50;
++		break;
++	case SNDRV_PCM_FORMAT_S24_LE:
++		data_length = 24;
++		bclk_ratio = 50;
+ 		break;
+ 	case SNDRV_PCM_FORMAT_S32_LE:
+ 		data_length = 32;
+-		bclk_ratio = 80;
++		bclk_ratio = 100;
+ 		break;
+ 	default:
+ 		return -EINVAL;
+@@ -420,7 +424,7 @@ static int bcm2835_i2s_hw_params(struct
+ 	/* Setup the frame format */
+ 	format = BCM2835_I2S_CHEN;
+ 
+-	if (data_length > 24)
++	if (data_length >= 24)
+ 		format |= BCM2835_I2S_CHWEX;
+ 
+ 	format |= BCM2835_I2S_CHWID((data_length-8)&0xf);
+@@ -711,6 +715,7 @@ static struct snd_soc_dai_driver bcm2835
+ 		.channels_max = 2,
+ 		.rates =	SNDRV_PCM_RATE_8000_192000,
+ 		.formats =	SNDRV_PCM_FMTBIT_S16_LE
++				| SNDRV_PCM_FMTBIT_S24_LE
+ 				| SNDRV_PCM_FMTBIT_S32_LE
+ 		},
+ 	.capture = {
+@@ -718,6 +723,7 @@ static struct snd_soc_dai_driver bcm2835
+ 		.channels_max = 2,
+ 		.rates =	SNDRV_PCM_RATE_8000_192000,
+ 		.formats =	SNDRV_PCM_FMTBIT_S16_LE
++				| SNDRV_PCM_FMTBIT_S24_LE
+ 				| SNDRV_PCM_FMTBIT_S32_LE
+ 		},
+ 	.ops = &bcm2835_i2s_dai_ops,