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authorMark Brown <broonie@opensource.wolfsonmicro.com>2013-02-11 11:06:33 +0000
committerMark Brown <broonie@opensource.wolfsonmicro.com>2013-02-11 11:06:33 +0000
commite790245eb3b437bb1d322cf3d5fbb603a138c9f7 (patch)
tree54469e8ec666cb4a03b541c218482f172b80bb24 /include/sound
parentd289323286d6b4e738458c31533da51d294d28a0 (diff)
parentfd23fb9f6bfd43a6e62b2646d18d5ca3edc3ebe3 (diff)
downloadlinux-e790245eb3b437bb1d322cf3d5fbb603a138c9f7.tar.bz2
Merge remote-tracking branch 'asoc/topic/cs4271' into asoc-next
Diffstat (limited to 'include/sound')
-rw-r--r--include/sound/cs4271.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/sound/cs4271.h b/include/sound/cs4271.h
index dd8c48d14ed9..70f45355acaa 100644
--- a/include/sound/cs4271.h
+++ b/include/sound/cs4271.h
@@ -20,6 +20,21 @@
struct cs4271_platform_data {
int gpio_nreset; /* GPIO driving Reset pin, if any */
bool amutec_eq_bmutec; /* flag to enable AMUTEC=BMUTEC */
+
+ /*
+ * The CS4271 requires its LRCLK and MCLK to be stable before its RESET
+ * line is de-asserted. That also means that clocks cannot be changed
+ * without putting the chip back into hardware reset, which also requires
+ * a complete re-initialization of all registers.
+ *
+ * One (undocumented) workaround is to assert and de-assert the PDN bit
+ * in the MODE2 register. This workaround can be enabled with the
+ * following flag.
+ *
+ * Note that this is not needed in case the clocks are stable
+ * throughout the entire runtime of the codec.
+ */
+ bool enable_soft_reset;
};
#endif /* __CS4271_H */