linux-kernel - Re: [PATCH v7 05/10] nvmem: qcom-spmi-sdam: Migrate to devm_spmi_subdevice_alloc_and

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Message-ID: <647b4acc-3310-4329-ac7a-77e86bab74a3@collabora.com>
Date: Wed, 14 Jan 2026 10:09:45 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Andy Shevchenko <andriy.shevchenko@...el.com>
Cc: jic23@...nel.org, dlechner@...libre.com, nuno.sa@...log.com,
 andy@...nel.org, arnd@...db.de, gregkh@...uxfoundation.org,
 srini@...nel.org, vkoul@...nel.org, neil.armstrong@...aro.org,
 sre@...nel.org, sboyd@...nel.org, krzk@...nel.org,
 dmitry.baryshkov@....qualcomm.com, quic_wcheng@...cinc.com,
 melody.olvera@....qualcomm.com, quic_nsekar@...cinc.com,
 ivo.ivanov.ivanov1@...il.com, abelvesa@...nel.org, luca.weiss@...rphone.com,
 konrad.dybcio@....qualcomm.com, mitltlatltl@...il.com,
 krishna.kurapati@....qualcomm.com, linux-arm-msm@...r.kernel.org,
 linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-phy@...ts.infradead.org, linux-pm@...r.kernel.org, kernel@...labora.com
Subject: Re: [PATCH v7 05/10] nvmem: qcom-spmi-sdam: Migrate to
 devm_spmi_subdevice_alloc_and_add()

Il 14/01/26 10:07, Andy Shevchenko ha scritto:
> On Wed, Jan 14, 2026 at 10:03:57AM +0100, AngeloGioacchino Del Regno wrote:
>> Il 14/01/26 10:00, Andy Shevchenko ha scritto:
>>> On Wed, Jan 14, 2026 at 09:59:40AM +0100, AngeloGioacchino Del Regno wrote:
>>>> Il 14/01/26 09:56, Andy Shevchenko ha scritto:
>>>>> On Wed, Jan 14, 2026 at 09:39:52AM +0100, AngeloGioacchino Del Regno wrote:
> 
> ...
> 
>>>>>> +	struct regmap_config sdam_regmap_config = {
>>>>>> +		.reg_bits = 16,
>>>>>> +		.val_bits = 8,
>>>>>
>>>>>> +		.max_register = 0x100,
>>>>>
>>>>> Are you sure? This might be a bad naming, but here max == the last accessible.
>>>>> I bet it has to be 0xff (but since the address is 16-bit it might be actually
>>>>> 257 registers, but sounds very weird).
>>>>
>>>> Yes, I'm sure.
>>>
>>> So, what is resided on address 0x100 ?
>>
>> I don't remember, this is research from around 5 months ago, when I've sent
>> the v1 of this.
>>
>> If you really want though, I can incorrectly set max_register to 0xff.
> 
> Why incorrectly? Can you dig into the datasheet and check, please? We don't
> know what is the 0x100 address means.
> 

I don't have any datasheets for Qualcomm IPs.

Cheers,
Angelo

>>>>>> +		.fast_io = true,
>>>>>> +	};
>