netdev - Re: [PATCH 01/28] mfd: Add Microchip ZL3073x support

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Message-ID: <79b9ee2f-091d-4e0f-bbe3-c56cf02c3532@redhat.com>
Date: Mon, 14 Apr 2025 13:52:15 +0200
From: Ivan Vecera <ivecera@...hat.com>
To: Andy Shevchenko <andy@...nel.org>
Cc: netdev@...r.kernel.org, Michal Schmidt <mschmidt@...hat.com>,
 Vadim Fedorenko <vadim.fedorenko@...ux.dev>,
 Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>,
 Jiri Pirko <jiri@...nulli.us>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Prathosh Satish <Prathosh.Satish@...rochip.com>,
 Lee Jones <lee@...nel.org>, Kees Cook <kees@...nel.org>,
 Andrew Morton <akpm@...ux-foundation.org>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH 01/28] mfd: Add Microchip ZL3073x support



On 14. 04. 25 1:39 odp., Ivan Vecera wrote:
> 
> 
> On 14. 04. 25 8:36 dop., Andy Shevchenko wrote:
>>> What is wrong here?
>>>
>>> I have a device that uses 7-bit addresses and have 16 register pages.
>>> Each pages is from 0x00-0x7f and register 0x7f is used as page selector
>>> where bits 0-3 select the page.
>> The problem is that you overlap virtual page over the real one (the 
>> main one).
>>
>> The drivers you mentioned in v2 discussions most likely are also buggy.
>> As I implied in the above question the developers hardly get the 
>> regmap ranges
>> right. It took me quite a while to see the issue, so it's not 
>> particularly your
>> fault.
> Hi Andy,
> 
> thank you I see the point.
> 
> Do you mean that the selector register should not be part of the range?
> 
> If so, does it mean that I have to specify a range for each page? Like 
> this:
> 
>      {
>          /* Page 0 */
>          .range_min    = 0x000,
>          .range_max    = 0x07e,
>          .selector_reg    = ZL3073x_PAGE_SEL,
>          .selector_mask    = GENMASK(3, 0),
>          .selector_shift    = 0,
>          .window_start    = 0,
>          .window_len    = 0x7e,
>      },
>      {
>          /* Page 1 */
>          .range_min    = 0x080,
>          .range_max    = 0x0fe,
>          .selector_reg    = ZL3073x_PAGE_SEL,
>          .selector_mask    = GENMASK(3, 0),
>          .selector_shift    = 0,
>          .window_start    = 0,
>          .window_len    = 0x7e,
>      },
> ...
> 
> 
> Thank you,
> Ivan
Sorry,
.window_len = 0x7f /* Exclude selector reg */

I.