linux-kernel - Re: [PATCH v2 1/2] memory: fsl_ifc: Make FSL

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Date: Tue, 28 May 2024 15:43:07 +0200
From: Esben Haabendal <esben@...nix.com>
To: Christophe Leroy <christophe.leroy@...roup.eu>
Cc: Krzysztof Kozlowski <krzk@...nel.org>,  Tudor Ambarus
 <tudor.ambarus@...aro.org>,  Pratyush Yadav <pratyush@...nel.org>,
  Michael Walle <mwalle@...nel.org>,  Miquel Raynal
 <miquel.raynal@...tlin.com>,  Richard Weinberger <richard@....at>,
  Vignesh Raghavendra <vigneshr@...com>,  Michael Ellerman
 <mpe@...erman.id.au>,  Nicholas Piggin <npiggin@...il.com>,  "Aneesh Kumar
 K.V" <aneesh.kumar@...nel.org>,  "Naveen N. Rao"
 <naveen.n.rao@...ux.ibm.com>,  "linux-kernel@...r.kernel.org"
 <linux-kernel@...r.kernel.org>,  "linux-mtd@...ts.infradead.org"
 <linux-mtd@...ts.infradead.org>,  "linuxppc-dev@...ts.ozlabs.org"
 <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH v2 1/2] memory: fsl_ifc: Make FSL_IFC config visible and
 selectable

Krzysztof Kozlowski <krzk@...nel.org> writes:

> On 28/05/2024 15:15, Christophe Leroy wrote:
>> Le 28/05/2024 à 14:28, Esben Haabendal a écrit :
>>> [Vous ne recevez pas souvent de courriers de esben@...nix.com. Découvrez pourquoi ceci est important à https://aka.ms/LearnAboutSenderIdentification ]
>>>
>>> While use of fsl_ifc driver with NAND flash is fine, as the fsl_ifc_nand
>>> driver selects FSL_IFC automatically, we need the CONFIG_FSL_IFC option to
>>> be selectable for platforms using fsl_ifc with NOR flash.
>> 
>> I don't understand.
>> 
>> Shall I understand :
>> 
>> While use of fsl_ifc driver with NAND flash is fine as the fsl_ifc_nand 
>> driver selects FSL_IFC automatically, ....
>> 
>> or
>> 
>> ..., as the fsl_ifc_nand driver selects FSL_IFC automatically we need 
>> the CONFIG_FSL_IFC option to be selectable for platforms using fsl_ifc 
>> with NOR flash
>> 
>> 
>> 
>> I'm fine with the fact that you want to be able to select it when you 
>> use NOR flashes, 
>
> But users are not fine... their memory won't work if they cannot choose
> it (if you meant select=choose).

Exactly. The IFC controller supports both NAND and NOR flashes. Since
commit ea0c0ad6b6eb ("memory: Enable compile testing for most of the drivers"),
it has not been possible to use IFC controller for NOR flashes without
selecting the IFC NAND driver (CONFIG_MTD_NAND_FSL_IFC), which is
obviously not how it is supposed to be.

/Esben