linux-kernel - Re: [PATCH 0/5] Implement setup_inteface() in the DaVinci NAND controller

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Message-ID: <fdf3d305-d6a9-47bb-b474-92da43b8d557@bootlin.com>
Date: Wed, 30 Oct 2024 13:39:22 +0100
From: Bastien Curutchet <bastien.curutchet@...tlin.com>
To: Krzysztof Kozlowski <krzk@...nel.org>,
 Santosh Shilimkar <ssantosh@...nel.org>,
 Miquel Raynal <miquel.raynal@...tlin.com>,
 Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>
Cc: linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
 Herve Codina <herve.codina@...tlin.com>,
 Christopher Cordahi <christophercordahi@...ometrics.ca>
Subject: Re: [PATCH 0/5] Implement setup_inteface() in the DaVinci NAND
 controller

Hi Krzysztof,

On 10/30/24 12:17 PM, Krzysztof Kozlowski wrote:
> On 30/10/2024 11:47, Bastien Curutchet wrote:
>> Hi all,
>>
>> This patch series aims to implement the setup_interface() operation in
>> the DaVinci NAND controller to enable the use of all ONFI modes and
>> improve the NAND access speed.
>>
> 
> Your changelog is supposed to explain also merging dependencies. Within
> patchset or external.

I'm not sure I understand what you mean here. Do you mean that I need to 
explicitly state that the patches in the 
drivers/mtd/nand/raw/davinci_nand.c depend on the ones in 
drivers/memory/ti-aemif.c ?

There isn't any external dependency on this patch series. The ONFI modes 
are already managed by the NAND core driver (in 
drivers/mtd/nand/raw/nand_base.c). If a NAND controller wants to benefit 
from all the ONFI modes, it needs to implement the setup_interface() 
operation; otherwise it can only use the mode 0 which is the slowest.

> 
>> This NAND controller is present in the DaVinci (OMAP L138) and Keystone2
>> SoCs and functions as a 'child' of the AEMIF controller. So its timings
>> are set by the AEMIF controller itself from device-tree properties.
>> Implementing the setup_interface() callback implies being able to update
>> dynamically these timings, so the first two patches of the series modify
>> the AEMIF driver to provide its 'children' a way to modify their chip
>> select timing configuration. To do so, I add a ti-aemif.h header, I'm not
>> sure whether this header should be located in include/memory or in
>> include/linux/memory. I put it in include/memory because the folder
>> already exists while include/linux/memory doesn't.
> 
> All Linux headers go to include/linux/, so this one should as well.
> 

Ok thank you, I'll move it there in V2.


Best regards,
Bastien