linux-kernel - Re: [PATCH v2 1/3] Input: mtk-pmic-keys - Transfer per-key bit in mtk_pmic_keys

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Date:   Mon, 30 May 2022 11:00:26 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     matthias.bgg@...il.com, mkorpershoek@...libre.com,
        linux-input@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] Input: mtk-pmic-keys - Transfer per-key bit in
 mtk_pmic_keys_regs

Il 27/05/22 07:34, Dmitry Torokhov ha scritto:
> On Tue, May 24, 2022 at 11:35:03AM +0200, AngeloGioacchino Del Regno wrote:
>> Place the key bit in struct mtk_pmic_keys_regs to enhance this
>> driver's flexibility, in preparation for adding support for more
>> PMICs.
>>
>> While at it, remove the definition of MTK_PMIC_RST_KEY_MASK as
>> we are now dynamically setting the keymask relatively to the keys
>> that are defined in the newly added rst_en_mask variable, on a
>> per-key basis.
>>
>> This commit brings no functional changes.
> 
> AngeloGioacchino,
> 
> Could you please tell me if these devices (currently supported by the
> driver) have 2 fully independent reset settings for HOME and PWR keys,
> or is there are actually 2 separate bits, one to enable/disable key
> reset, and another controlling what keys will cause the reset - only PWR
> or either PWR or HOME?
> 
> Thanks.
> 


Hello Dmitry,

there are two separate bits for the "Long Press Reset", you can achieve
reset with either holding the power button, volume up button (register
name is HOMEKEY because on very old devices this was a "home" button),
or both - for a certain amount of time.
If both {HOME,PWR}KEY_RST_EN bits are *not set*, the long press reset
PMIC trigger will be disabled.
Long-press time is controlled with the RST_DU register.

Regards,
Angelo