brcm2708: update linux 4.4 patches to latest version

As usual these patches were extracted and rebased from the raspberry pi repo:
https://github.com/raspberrypi/linux/tree/rpi-4.4.y

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

1 files changed, 324 insertions, 0 deletions

diff --git a/target/linux/brcm2708/patches-4.4/0507-Allo-Piano-DAC-boards-Initial-2-channel-stereo-suppo.patch b/target/linux/brcm2708/patches-4.4/0507-Allo-Piano-DAC-boards-Initial-2-channel-stereo-suppo.patch
new file mode 100644
index 0000000..16a9b07
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.4/0507-Allo-Piano-DAC-boards-Initial-2-channel-stereo-suppo.patch
@@ -0,0 +1,324 @@
+From 655114c25214675520d742f5e86cdd8dd534e6c7 Mon Sep 17 00:00:00 2001
+From: Clive Messer <clive.m.messer@gmail.com>
+Date: Mon, 19 Sep 2016 14:01:04 +0100
+Subject: [PATCH] Allo Piano DAC boards: Initial 2 channel (stereo) support
+ (#1645)
+
+Add initial 2 channel (stereo) support for Allo Piano DAC (2.0/2.1) boards,
+using allo-piano-dac-pcm512x-audio overlay and allo-piano-dac ALSA ASoC
+machine driver.
+
+NB. The initial support is 2 channel (stereo) ONLY!
+(The Piano DAC 2.1 will only support 2 channel (stereo) left/right output,
+ pending an update to the upstream pcm512x codec driver, which will have
+ to be submitted via upstream. With the initial downstream support,
+ provided by this patch, the Piano DAC 2.1 subwoofer outputs will
+ not function.)
+
+Signed-off-by: Baswaraj K <jaikumar@cem-solutions.net>
+Signed-off-by: Clive Messer <clive.messer@digitaldreamtime.co.uk>
+Tested-by: Clive Messer <clive.messer@digitaldreamtime.co.uk>
+---
+ arch/arm/boot/dts/overlays/Makefile                |   1 +
+ arch/arm/boot/dts/overlays/README                  |  20 +++
+ .../allo-piano-dac-pcm512x-audio-overlay.dts       |  54 ++++++++
+ arch/arm/configs/bcm2709_defconfig                 |   1 +
+ arch/arm/configs/bcmrpi_defconfig                  |   1 +
+ sound/soc/bcm/Kconfig                              |   7 +
+ sound/soc/bcm/Makefile                             |   2 +
+ sound/soc/bcm/allo-piano-dac.c                     | 144 +++++++++++++++++++++
+ 8 files changed, 230 insertions(+)
+ create mode 100644 arch/arm/boot/dts/overlays/allo-piano-dac-pcm512x-audio-overlay.dts
+ create mode 100644 sound/soc/bcm/allo-piano-dac.c
+
+--- a/arch/arm/boot/dts/overlays/Makefile
++++ b/arch/arm/boot/dts/overlays/Makefile
+@@ -16,6 +16,7 @@ dtbo-$(RPI_DT_OVERLAYS) += adau1977-adc.
+ dtbo-$(RPI_DT_OVERLAYS) += ads1015.dtbo
+ dtbo-$(RPI_DT_OVERLAYS) += ads7846.dtbo
+ dtbo-$(RPI_DT_OVERLAYS) += akkordion-iqdacplus.dtbo
++dtbo-$(RPI_DT_OVERLAYS) += allo-piano-dac-pcm512x-audio.dtbo
+ dtbo-$(RPI_DT_OVERLAYS) += at86rf233.dtbo
+ dtbo-$(RPI_DT_OVERLAYS) += audioinjector-wm8731-audio.dtbo
+ dtbo-$(RPI_DT_OVERLAYS) += audremap.dtbo
+--- a/arch/arm/boot/dts/overlays/README
++++ b/arch/arm/boot/dts/overlays/README
+@@ -235,6 +235,26 @@ Params: 24db_digital_gain       Allow ga
+                                 that does not result in clipping/distortion!)
+ 
+ 
++Name:   allo-piano-dac-pcm512x-audio
++Info:   Configures the Allo Piano DAC (2.0/2.1) audio cards.
++        (NB. This initial support is for 2.0 channel audio ONLY! ie. stereo.
++        The subwoofer outputs on the Piano 2.1 are not currently supported!)
++Load:   dtoverlay=allo-piano-dac-pcm512x-audio,<param>
++Params: 24db_digital_gain       Allow gain to be applied via the PCM512x codec
++                                Digital volume control.
++                                (The default behaviour is that the Digital
++                                volume control is limited to a maximum of
++                                0dB. ie. it can attenuate but not provide
++                                gain. For most users, this will be desired
++                                as it will prevent clipping. By appending
++                                the 24db_digital_gain parameter, the Digital
++                                volume control will allow up to 24dB of
++                                gain. If this parameter is enabled, it is the
++                                responsibility of the user to ensure that
++                                the Digital volume control is set to a value
++                                that does not result in clipping/distortion!)
++
++
+ Name:   at86rf233
+ Info:   Configures the Atmel AT86RF233 802.15.4 low-power WPAN transceiver,
+         connected to spi0.0
+--- /dev/null
++++ b/arch/arm/boot/dts/overlays/allo-piano-dac-pcm512x-audio-overlay.dts
+@@ -0,0 +1,54 @@
++/*
++ * Definitions for Allo Piano DAC (2.0/2.1) boards
++ *
++ * NB. The Piano DAC 2.1 board contains 2x TI PCM5142 DAC's. One DAC is stereo
++ * (left/right) and the other provides a subwoofer output, using DSP on the
++ * chip for digital high/low pass crossover.
++ * The initial support for this hardware, that doesn't require any codec driver
++ * modifications, uses only one DAC chip for stereo (left/right) output, the
++ * chip with 0x4c slave address. The other chip at 0x4d is currently ignored!
++ */
++
++/dts-v1/;
++/plugin/;
++
++/ {
++	compatible = "brcm,bcm2708";
++
++	fragment@0 {
++		target = <&i2s>;
++		__overlay__ {
++			status = "okay";
++		};
++	};
++
++	fragment@1 {
++		target = <&i2c1>;
++		__overlay__ {
++			#address-cells = <1>;
++			#size-cells = <0>;
++			status = "okay";
++
++			pcm5142@4c {
++				#sound-dai-cells = <0>;
++				compatible = "ti,pcm5142";
++				reg = <0x4c>;
++				status = "okay";
++			};
++		};
++	};
++
++	fragment@2 {
++		target = <&sound>;
++		piano_dac: __overlay__ {
++			compatible = "allo,piano-dac";
++			i2s-controller = <&i2s>;
++			status = "okay";
++		};
++	};
++
++	__overrides__ {
++		24db_digital_gain =
++			<&piano_dac>,"allo,24db_digital_gain?";
++	};
++};
+--- a/arch/arm/configs/bcm2709_defconfig
++++ b/arch/arm/configs/bcm2709_defconfig
+@@ -879,6 +879,7 @@ CONFIG_SND_BCM2708_SOC_ADAU1977_ADC=m
+ CONFIG_SND_AUDIOINJECTOR_PI_SOUNDCARD=m
+ CONFIG_SND_DIGIDAC1_SOUNDCARD=m
+ CONFIG_SND_BCM2708_SOC_DIONAUDIO_LOCO=m
++CONFIG_SND_BCM2708_SOC_ALLO_PIANO_DAC=m
+ CONFIG_SND_SOC_ADAU1701=m
+ CONFIG_SND_SOC_WM8804_I2C=m
+ CONFIG_SND_SIMPLE_CARD=m
+--- a/arch/arm/configs/bcmrpi_defconfig
++++ b/arch/arm/configs/bcmrpi_defconfig
+@@ -871,6 +871,7 @@ CONFIG_SND_BCM2708_SOC_ADAU1977_ADC=m
+ CONFIG_SND_AUDIOINJECTOR_PI_SOUNDCARD=m
+ CONFIG_SND_DIGIDAC1_SOUNDCARD=m
+ CONFIG_SND_BCM2708_SOC_DIONAUDIO_LOCO=m
++CONFIG_SND_BCM2708_SOC_ALLO_PIANO_DAC=m
+ CONFIG_SND_SOC_ADAU1701=m
+ CONFIG_SND_SOC_WM8804_I2C=m
+ CONFIG_SND_SIMPLE_CARD=m
+--- a/sound/soc/bcm/Kconfig
++++ b/sound/soc/bcm/Kconfig
+@@ -114,3 +114,10 @@ config SND_BCM2708_SOC_DIONAUDIO_LOCO
+ 	select SND_SOC_PCM5102a
+ 	help
+ 	  Say Y or M if you want to add support for Dion Audio LOCO.
++
++config SND_BCM2708_SOC_ALLO_PIANO_DAC
++	tristate "Support for Allo Piano DAC"
++	depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
++	select SND_SOC_PCM512x_I2C
++	help
++	  Say Y or M if you want to add support for Allo Piano DAC.
+--- a/sound/soc/bcm/Makefile
++++ b/sound/soc/bcm/Makefile
+@@ -19,6 +19,7 @@ snd-soc-raspidac3-objs := raspidac3.o
+ snd-soc-audioinjector-pi-soundcard-objs := audioinjector-pi-soundcard.o
+ snd-soc-digidac1-soundcard-objs := digidac1-soundcard.o
+ snd-soc-dionaudio-loco-objs := dionaudio_loco.o
++snd-soc-allo-piano-dac-objs := allo-piano-dac.o
+ 
+ obj-$(CONFIG_SND_BCM2708_SOC_ADAU1977_ADC) += snd-soc-adau1977-adc.o
+ obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC) += snd-soc-hifiberry-dac.o
+@@ -35,3 +36,4 @@ obj-$(CONFIG_SND_BCM2708_SOC_RASPIDAC3)
+ obj-$(CONFIG_SND_AUDIOINJECTOR_PI_SOUNDCARD) += snd-soc-audioinjector-pi-soundcard.o
+ obj-$(CONFIG_SND_DIGIDAC1_SOUNDCARD) += snd-soc-digidac1-soundcard.o
+ obj-$(CONFIG_SND_BCM2708_SOC_DIONAUDIO_LOCO) += snd-soc-dionaudio-loco.o
++obj-$(CONFIG_SND_BCM2708_SOC_ALLO_PIANO_DAC) += snd-soc-allo-piano-dac.o
+--- /dev/null
++++ b/sound/soc/bcm/allo-piano-dac.c
+@@ -0,0 +1,144 @@
++/*
++ * ALSA ASoC Machine Driver for Allo Piano DAC
++ *
++ * Author:	Baswaraj K <jaikumar@cem-solutions.net>
++ *		Copyright 2016
++ *		based on code by Daniel Matuschek <info@crazy-audio.com>
++ *		based on code by Florian Meier <florian.meier@koalo.de>
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU General Public License
++ * version 2 as published by the Free Software Foundation.
++ *
++ * This program is distributed in the hope that it will be useful, but
++ * WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
++ * General Public License for more details.
++ */
++
++#include <linux/module.h>
++#include <linux/platform_device.h>
++
++#include <sound/core.h>
++#include <sound/pcm.h>
++#include <sound/pcm_params.h>
++#include <sound/soc.h>
++
++static bool digital_gain_0db_limit = true;
++
++static int snd_allo_piano_dac_init(struct snd_soc_pcm_runtime *rtd)
++{
++	if (digital_gain_0db_limit) {
++		int ret;
++		struct snd_soc_card *card = rtd->card;
++
++		ret = snd_soc_limit_volume(card, "Digital Playback Volume",
++					   207);
++		if (ret < 0)
++			dev_warn(card->dev, "Failed to set volume limit: %d\n",
++				 ret);
++	}
++
++	return 0;
++}
++
++static int snd_allo_piano_dac_hw_params(
++	struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params)
++{
++	struct snd_soc_pcm_runtime *rtd = substream->private_data;
++	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
++
++	unsigned int sample_bits =
++		snd_pcm_format_physical_width(params_format(params));
++
++	return snd_soc_dai_set_bclk_ratio(cpu_dai, sample_bits * 2);
++}
++
++/* machine stream operations */
++static struct snd_soc_ops snd_allo_piano_dac_ops = {
++	.hw_params = snd_allo_piano_dac_hw_params,
++};
++
++static struct snd_soc_dai_link snd_allo_piano_dac_dai[] = {
++{
++	.name		= "Piano DAC",
++	.stream_name	= "Piano DAC HiFi",
++	.cpu_dai_name	= "bcm2708-i2s.0",
++	.codec_dai_name	= "pcm512x-hifi",
++	.platform_name	= "bcm2708-i2s.0",
++	.codec_name	= "pcm512x.1-004c",
++	.dai_fmt	= SND_SOC_DAIFMT_I2S |
++			  SND_SOC_DAIFMT_NB_NF |
++			  SND_SOC_DAIFMT_CBS_CFS,
++	.ops		= &snd_allo_piano_dac_ops,
++	.init		= snd_allo_piano_dac_init,
++},
++};
++
++/* audio machine driver */
++static struct snd_soc_card snd_allo_piano_dac = {
++	.name         = "PianoDAC",
++	.owner        = THIS_MODULE,
++	.dai_link     = snd_allo_piano_dac_dai,
++	.num_links    = ARRAY_SIZE(snd_allo_piano_dac_dai),
++};
++
++static int snd_allo_piano_dac_probe(struct platform_device *pdev)
++{
++	int ret = 0;
++
++	snd_allo_piano_dac.dev = &pdev->dev;
++
++	if (pdev->dev.of_node) {
++		struct device_node *i2s_node;
++		struct snd_soc_dai_link *dai;
++
++		dai = &snd_allo_piano_dac_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;
++		}
++
++		digital_gain_0db_limit = !of_property_read_bool(
++			pdev->dev.of_node, "allo,24db_digital_gain");
++	}
++
++	ret = snd_soc_register_card(&snd_allo_piano_dac);
++	if (ret)
++		dev_err(&pdev->dev,
++			"snd_soc_register_card() failed: %d\n", ret);
++
++	return ret;
++}
++
++static int snd_allo_piano_dac_remove(struct platform_device *pdev)
++{
++	return snd_soc_unregister_card(&snd_allo_piano_dac);
++}
++
++static const struct of_device_id snd_allo_piano_dac_of_match[] = {
++	{ .compatible = "allo,piano-dac", },
++	{ /* sentinel */ },
++};
++MODULE_DEVICE_TABLE(of, snd_allo_piano_dac_of_match);
++
++static struct platform_driver snd_allo_piano_dac_driver = {
++	.driver = {
++		.name   = "snd-allo-piano-dac",
++		.owner  = THIS_MODULE,
++		.of_match_table = snd_allo_piano_dac_of_match,
++	},
++	.probe          = snd_allo_piano_dac_probe,
++	.remove         = snd_allo_piano_dac_remove,
++};
++
++module_platform_driver(snd_allo_piano_dac_driver);
++
++MODULE_AUTHOR("Baswaraj K <jaikumar@cem-solutions.net>");
++MODULE_DESCRIPTION("ALSA ASoC Machine Driver for Allo Piano DAC");
++MODULE_LICENSE("GPL v2");