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950-0430-staging-bcm2835-audio-Drop-DT-dependency.patch
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950-0430-staging-bcm2835-audio-Drop-DT-dependency.patch
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From 1ddeeda8208bc269c90aad4bd8bb878f7436f62d Mon Sep 17 00:00:00 2001
From: Stefan Wahren <stefan.wahren@i2se.com>
Date: Thu, 6 Dec 2018 19:28:58 +0100
Subject: [PATCH] staging: bcm2835-audio: Drop DT dependency
commit 438fc48260a0afc4cee733e5bc20234ff2bbef56 upstream.
Just like the bcm2835-video make this a platform driver which is probed
by vchiq. In order to change the number of channels use a module
parameter instead, but use the maximum as default.
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
.../vc04_services/bcm2835-audio/bcm2835.c | 31 ++++++-------------
1 file changed, 9 insertions(+), 22 deletions(-)
--- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
+++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
@@ -6,13 +6,13 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
-#include <linux/of.h>
#include "bcm2835.h"
static bool enable_hdmi;
static bool enable_headphones;
static bool enable_compat_alsa = true;
+static int num_channels = MAX_SUBSTREAMS;
module_param(enable_hdmi, bool, 0444);
MODULE_PARM_DESC(enable_hdmi, "Enables HDMI virtual audio device");
@@ -21,6 +21,8 @@ MODULE_PARM_DESC(enable_headphones, "Ena
module_param(enable_compat_alsa, bool, 0444);
MODULE_PARM_DESC(enable_compat_alsa,
"Enables ALSA compatibility virtual audio device");
+module_param(num_channels, int, 0644);
+MODULE_PARM_DESC(num_channels, "Number of audio channels (default: 8)");
static void bcm2835_devm_free_vchi_ctx(struct device *dev, void *res)
{
@@ -294,28 +296,19 @@ static int snd_add_child_devices(struct
static int snd_bcm2835_alsa_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
- u32 numchans;
int err;
- err = of_property_read_u32(dev->of_node, "brcm,pwm-channels",
- &numchans);
- if (err) {
- dev_err(dev, "Failed to get DT property 'brcm,pwm-channels'");
- return err;
- }
-
- if (numchans == 0 || numchans > MAX_SUBSTREAMS) {
- numchans = MAX_SUBSTREAMS;
- dev_warn(dev,
- "Illegal 'brcm,pwm-channels' value, will use %u\n",
- numchans);
+ if (num_channels <= 0 || num_channels > MAX_SUBSTREAMS) {
+ num_channels = MAX_SUBSTREAMS;
+ dev_warn(dev, "Illegal num_channels value, will use %u\n",
+ num_channels);
}
err = bcm2835_devm_add_vchi_ctx(dev);
if (err)
return err;
- err = snd_add_child_devices(dev, numchans);
+ err = snd_add_child_devices(dev, num_channels);
if (err)
return err;
@@ -337,12 +330,6 @@ static int snd_bcm2835_alsa_resume(struc
#endif
-static const struct of_device_id snd_bcm2835_of_match_table[] = {
- { .compatible = "brcm,bcm2835-audio",},
- {},
-};
-MODULE_DEVICE_TABLE(of, snd_bcm2835_of_match_table);
-
static struct platform_driver bcm2835_alsa_driver = {
.probe = snd_bcm2835_alsa_probe,
#ifdef CONFIG_PM
@@ -351,7 +338,6 @@ static struct platform_driver bcm2835_al
#endif
.driver = {
.name = "bcm2835_audio",
- .of_match_table = snd_bcm2835_of_match_table,
},
};
module_platform_driver(bcm2835_alsa_driver);
@@ -359,3 +345,4 @@ module_platform_driver(bcm2835_alsa_driv
MODULE_AUTHOR("Dom Cobley");
MODULE_DESCRIPTION("Alsa driver for BCM2835 chip");
MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:bcm2835_audio");