From 63757aefe3befc1044ba041042bf7eca6e52df8b Mon Sep 17 00:00:00 2001 From: Florian Meier Date: Fri, 22 Nov 2013 19:04:54 +0100 Subject: [PATCH 036/222] BCM2708: Add I2S support to board file Adds the required initializations for I2S to the board file of mach-bcm2708. Signed-off-by: Florian Meier bcm2708-i2s: Enable MMAP support via a DT property and overlay The i2s driver used to claim to support MMAP, but that feature was disabled when some problems were found. Add the ability to enable this feature through Device Tree, using the i2s-mmap overlay. See: #1004 --- arch/arm/mach-bcm2708/bcm2708.c | 26 ++++++++++++++++++++++++++ sound/soc/bcm/bcm2708-i2s.c | 7 ++++++- 2 files changed, 32 insertions(+), 1 deletion(-) --- a/arch/arm/mach-bcm2708/bcm2708.c +++ b/arch/arm/mach-bcm2708/bcm2708.c @@ -616,6 +616,28 @@ static struct platform_device bcm2835_th .name = "bcm2835_thermal", }; +#if defined(CONFIG_SND_BCM2708_SOC_I2S) || defined(CONFIG_SND_BCM2708_SOC_I2S_MODULE) +static struct resource bcm2708_i2s_resources[] = { + { + .start = I2S_BASE, + .end = I2S_BASE + 0x20, + .flags = IORESOURCE_MEM, + }, + { + .start = PCM_CLOCK_BASE, + .end = PCM_CLOCK_BASE + 0x02, + .flags = IORESOURCE_MEM, + } +}; + +static struct platform_device bcm2708_i2s_device = { + .name = "bcm2708-i2s", + .id = 0, + .num_resources = ARRAY_SIZE(bcm2708_i2s_resources), + .resource = bcm2708_i2s_resources, +}; +#endif + int __init bcm_register_device(struct platform_device *pdev) { int ret; @@ -780,6 +802,10 @@ void __init bcm2708_init(void) bcm_register_device_dt(&bcm2835_thermal_device); +#if defined(CONFIG_SND_BCM2708_SOC_I2S) || defined(CONFIG_SND_BCM2708_SOC_I2S_MODULE) + bcm_register_device_dt(&bcm2708_i2s_device); +#endif + if (!use_dt) { for (i = 0; i < ARRAY_SIZE(amba_devs); i++) { struct amba_device *d = amba_devs[i]; --- a/sound/soc/bcm/bcm2708-i2s.c +++ b/sound/soc/bcm/bcm2708-i2s.c @@ -874,7 +874,7 @@ static const struct snd_soc_component_dr .name = "bcm2708-i2s-comp", }; -static const struct snd_pcm_hardware bcm2708_pcm_hardware = { +static struct snd_pcm_hardware bcm2708_pcm_hardware = { .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_JOINT_DUPLEX, .formats = SNDRV_PCM_FMTBIT_S16_LE | @@ -902,6 +902,11 @@ static int bcm2708_i2s_probe(struct plat struct regmap *regmap[2]; struct resource *mem[2]; + if (of_property_read_bool(pdev->dev.of_node, "brcm,enable-mmap")) + bcm2708_pcm_hardware.info |= + SNDRV_PCM_INFO_MMAP | + SNDRV_PCM_INFO_MMAP_VALID; + /* Request both ioareas */ for (i = 0; i <= 1; i++) { void __iomem *base;