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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 patch adds a new flag to both the DT bindings as well as to the platform data to enable that workaround. Signed-off-by: Daniel Mack <zonque@gmail.com> Acked-by: Alexander Sverdlin <subaparts@yandex.ru> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
40 lines
1.4 KiB
C
40 lines
1.4 KiB
C
/*
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* Definitions for CS4271 ASoC codec driver
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*
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* Copyright (c) 2010 Alexander Sverdlin <subaparts@yandex.ru>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __CS4271_H
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#define __CS4271_H
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struct cs4271_platform_data {
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int gpio_nreset; /* GPIO driving Reset pin, if any */
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bool amutec_eq_bmutec; /* flag to enable AMUTEC=BMUTEC */
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/*
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* The CS4271 requires its LRCLK and MCLK to be stable before its RESET
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* line is de-asserted. That also means that clocks cannot be changed
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* without putting the chip back into hardware reset, which also requires
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* a complete re-initialization of all registers.
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*
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* One (undocumented) workaround is to assert and de-assert the PDN bit
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* in the MODE2 register. This workaround can be enabled with the
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* following flag.
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*
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* Note that this is not needed in case the clocks are stable
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* throughout the entire runtime of the codec.
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*/
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bool enable_soft_reset;
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};
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#endif /* __CS4271_H */
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