linux-kernel - Re: [PATCH v1 0/2] Meson NAND: waiting w/o wired ready/busy pin

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Date:   Wed, 7 Jun 2023 18:18:39 +0300
From:   Arseniy Krasnov <avkrasnov@...rdevices.ru>
To:     Liang Yang <liang.yang@...ogic.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
CC:     <oxffffaa@...il.com>, <kernel@...rdevices.ru>,
        <linux-mtd@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-amlogic@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 0/2] Meson NAND: waiting w/o wired ready/busy pin



On 07.06.2023 17:50, Arseniy Krasnov wrote:
> Main thing that this patchset adds is support for waiting for command
> completion when there is no wired ready/busy pin. This is implemented
> by using Meson specific command which operates without wired pin, but
> supports interrupt driven waiting (default way for waiting without
> hardware pin is 'nand_soft_waitrdy()' which uses software loop instead
> of interrupt). To select which mode to use during driver initialization,
> common NAND controller property is used - 'nand-rb'. It is described in
> 'nand-controller.yaml'. But for Meson, its description was missed in
> 'amlogic,meson-nand.yaml', so this patchset also adds support for it.
> 
> Patch for bindings was tested with dt_binding_check and dtbs_check.
> 
> Arseniy Krasnov (2):
>   dt-bindings: nand: meson: Fix 'nand-rb' property
>   mtd: rawnand: meson: waiting w/o wired ready/busy pin
> 
>  .../bindings/mtd/amlogic,meson-nand.yaml      |  7 ++
>  drivers/mtd/nand/raw/meson_nand.c             | 82 ++++++++++++++++++-
>  2 files changed, 85 insertions(+), 4 deletions(-)
> 

Changelog:
* Two separate patches:
  For bindings: https://lore.kernel.org/linux-mtd/20230606193507.35024-1-AVKrasnov@sberdevices.ru/
  For driver: https://lore.kernel.org/linux-mtd/20230607073015.1280085-1-AVKrasnov@sberdevices.ru/
  Now fixed/updated and combined to this patchset with v1 version.

* In binding patch:
  * Invalid type of 'nand-rb' is fixed, it was 'bool', now it is 'uint32 array' as required. Also
    new declaration of 'nand-rb' contains several restrictions like number of elements and min/max
    value of elements.
  * Location of 'nand-rb' is moved from the controller object to the chip object as required.

* In driver patch:
  * Update comment which describes when it is needed to send NAND_CMD_READ0 to
    leave command waiting loop.
  * Change type of 'no_rb_pin' to 'bool' as in v1. Now it is just a flag which selects
    mode to wait for command completion.

Thanks, Arseniy