linux-kernel - Re: [PATCH] spi: dw_bt1: fix MUX

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Date:   Sun, 18 Dec 2022 18:56:24 +0100
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Serge Semin" <fancer.lancer@...il.com>,
        "Arnd Bergmann" <arnd@...nel.org>
Cc:     "Mark Brown" <broonie@...nel.org>,
        "Serge Semin" <Sergey.Semin@...kalelectronics.ru>,
        "Ramil Zaripov" <Ramil.Zaripov@...kalelectronics.ru>,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] spi: dw_bt1: fix MUX_MMIO dependencies

On Sun, Dec 18, 2022, at 15:22, Serge Semin wrote:
> Hi Arnd
>
> On Thu, Dec 15, 2022 at 05:52:34PM +0100, Arnd Bergmann wrote:
>> From: Arnd Bergmann <arnd@...db.de>
>> 
>> Selecting a symbol with additional dependencies requires
>> adding the same dependency here:
>> 
>> WARNING: unmet direct dependencies detected for MUX_MMIO
>>   Depends on [n]: MULTIPLEXER [=y] && OF [=n]
>>   Selected by [y]:
>>   - SPI_DW_BT1 [=y] && SPI [=y] && SPI_MASTER [=y] && SPI_DESIGNWARE [=y] && (MIPS_BAIKAL_T1 || COMPILE_TEST [=y])
>> 
>> Alternatively, we could drop this 'select' and require users to manually
>> put it into their .config as we do for other drivers.
>
> Thanks for the patch. Seeing the driver is only implicitly dependent
> from the mux-mmio driver (via the device described in the device tree
> blob) I'd suggest to either drop the MUX_MMIO config reverse
> dependency or convert it to the weak one - 'imply' (if it will solve
> the problem).

Ok, I'll send a new patch. I don't want to use 'imply' though, that
tends to cause other problems because almost nobody understands what
it actually does.

      Arnd