3.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stephen Warren <swar...@nvidia.com>

commit e126a646f77fdd66978785cb0a3a5e46b07aee2e upstream.

The REVISION_ID register is not currently marked readable. snd_soc_read()
refuses to read the register, and hence probe() fails.

Fixes: d4807ad2c4c0 ("regmap: Check readable regs in _regmap_read")
[exposed the bug, by checking for readability]
Fixes: 685e42154dcf ("ASoC: Replace max98090 Device Driver")
[left out this register from the readable list]
Signed-off-by: Stephen Warren <swar...@nvidia.com>
Signed-off-by: Mark Brown <broo...@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 sound/soc/codecs/max98090.c |    1 +
 1 file changed, 1 insertion(+)

--- a/sound/soc/codecs/max98090.c
+++ b/sound/soc/codecs/max98090.c
@@ -336,6 +336,7 @@ static bool max98090_readable_register(s
        case M98090_REG_RECORD_TDM_SLOT:
        case M98090_REG_SAMPLE_RATE:
        case M98090_REG_DMIC34_BIQUAD_BASE ... M98090_REG_DMIC34_BIQUAD_BASE + 
0x0E:
+       case M98090_REG_REVISION_ID:
                return true;
        default:
                return false;


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