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- From d4e3e25ba7157e76f248ad9ec5a0ea87d47a06f8 Mon Sep 17 00:00:00 2001
- From: Matthias Reichl <hias@horus.com>
- Date: Sun, 11 Oct 2015 15:55:21 +0200
- Subject: [PATCH 019/381] bcm2835-i2s: Enable MMAP support via a DT property
- Code ported from bcm2708-i2s driver in Raspberry Pi tree.
- RPi commit 7ee829fd77a30127db5d0b3c7d79b8718166e568 ("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
- Signed-off-by: Matthias Reichl <hias@horus.com>
- ---
- sound/soc/bcm/bcm2835-i2s.c | 7 ++++++-
- 1 file changed, 6 insertions(+), 1 deletion(-)
- --- a/sound/soc/bcm/bcm2835-i2s.c
- +++ b/sound/soc/bcm/bcm2835-i2s.c
- @@ -799,7 +799,7 @@ static const struct snd_soc_component_dr
- .name = "bcm2835-i2s-comp",
- };
-
- -static const struct snd_pcm_hardware bcm2835_pcm_hardware = {
- +static struct snd_pcm_hardware bcm2835_pcm_hardware = {
- .info = SNDRV_PCM_INFO_INTERLEAVED |
- SNDRV_PCM_INFO_JOINT_DUPLEX,
- .formats = SNDRV_PCM_FMTBIT_S16_LE |
- @@ -835,6 +835,11 @@ static int bcm2835_i2s_probe(struct plat
- }
- dma_reg_base = be32_to_cpup(addr);
-
- + if (of_property_read_bool(pdev->dev.of_node, "brcm,enable-mmap"))
- + bcm2835_pcm_hardware.info |=
- + SNDRV_PCM_INFO_MMAP |
- + SNDRV_PCM_INFO_MMAP_VALID;
- +
- /* Request both ioareas */
- for (i = 0; i <= 1; i++) {
- void __iomem *base;
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