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commite126a646f7upstream. The REVISION_ID register is not currently marked readable. snd_soc_read() refuses to read the register, and hence probe() fails. Fixes:d4807ad2c4("regmap: Check readable regs in _regmap_read") [exposed the bug, by checking for readability] Fixes:685e42154d("ASoC: Replace max98090 Device Driver") [left out this register from the readable list] Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Mark Brown <broonie@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>