linux-kernel - Re: [PATCH 5/5] ASoC: cs34l45: Hibernation support

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Message-ID: <6f34d2c8-21b5-5b75-a3cd-15f88ba0f760@opensource.cirrus.com>
Date:   Thu, 2 Mar 2023 11:59:05 -0600
From:   Vlad Karpovich <vkarpovi@...nsource.cirrus.com>
To:     Mark Brown <broonie@...nel.org>
CC:     Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, <alsa-devel@...a-project.org>,
        <patches@...nsource.cirrus.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/5] ASoC: cs34l45: Hibernation support

The CS35L45 features a low-power Hibernation State. In this state, all 
register contents are lost, but the contents of
RAM are retained. In the Hibernation State, only always-on digital 
functions to support wake-up are enabled.
Entry to this state is achieved via the register interface (either by an 
external driver using the control port, or the
programmable DSP). Exit from this state is triggered by activity on 
device GPIO pins, intended SPI transaction, or I2C
transaction with intended slave address

On 3/2/23 11:19, Mark Brown wrote:
> On Thu, Mar 02, 2023 at 11:11:54AM -0600, Vlad Karpovich wrote:
>> From: "Vlad.Karpovich" <vkarpovi@...nsource.cirrus.com>
>>
>> Adds support for the amplifier hibernation controlled by
>> DSP firmware.
> What is amplifier hibernation?