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From:   Ulf Hansson <ulf.hansson@linaro.org>
Date:   Tue, 8 Aug 2023 12:59:52 +0200
Message-ID: <CAPDyKFrpWgA=e-FSoKfYhWSOq5m5_pHjxgzaGeOFHFhU_mcmNw@mail.gmail.com>
Subject: Re: [RFC PATCH 2/6] mmc: block: set fwnode of disk devices
To:     Daniel Golle <daniel@makrotopia.org>
Cc:     Jens Axboe <axboe@kernel.dk>,
        Miquel Raynal <miquel.raynal@bootlin.com>,
        Richard Weinberger <richard@nod.at>,
        Vignesh Raghavendra <vigneshr@ti.com>,
        Dave Chinner <dchinner@redhat.com>,
        Matthew Wilcox <willy@infradead.org>,
        =?UTF-8?Q?Thomas_Wei=C3=9Fschuh?= <linux@weissschuh.net>,
        Jan Kara <jack@suse.cz>, Damien Le Moal <dlemoal@kernel.org>,
        Ming Lei <ming.lei@redhat.com>, Min Li <min15.li@samsung.com>,
        Christian Loehle <CLoehle@hyperstone.com>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Hannes Reinecke <hare@suse.de>,
        Jack Wang <jinpu.wang@ionos.com>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Yeqi Fu <asuk4.q@gmail.com>, Avri Altman <avri.altman@wdc.com>,
        Hans de Goede <hdegoede@redhat.com>,
        Ye Bin <yebin10@huawei.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= <rafal@milecki.pl>,
        linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-mmc@vger.kernel.org, linux-mtd@lists.infradead.org
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On Tue, 8 Aug 2023 at 03:02, Daniel Golle <daniel@makrotopia.org> wrote:
>
> Hi Ulf,
>
> thank you for reviewing and suggesting ways to improve this series!
>
> On Mon, Aug 07, 2023 at 03:48:31PM +0200, Ulf Hansson wrote:
> > On Thu, 20 Jul 2023 at 00:02, Daniel Golle <daniel@makrotopia.org> wrote:
> > >
> > > Set fwnode of disk devices to 'block', 'boot0' and 'boot1' subnodes of
> > > the mmc-card. This is done in preparation for having the eMMC act as
> > > NVMEM provider.
> >
> > Sorry, but I don't quite understand what you are trying to do here.
> > Maybe you should re-order the patches in the series so it becomes
> > clear why this is needed?
> >
> > Moreover, I don't see any DT docs being updated as a part of the
> > series, which looks like it is needed too. That would also help to
> > understand what you are proposing, I think.
>
> I've prepared a tree on Github which now also includes commits adding
> dt-bindings for block devices and partitions, so they can be referenced
> as nvmem-cells provider.
>
> The dt-schema addition supposedly explaining this specific patch:
>
> https://github.com/dangowrt/linux/commit/b399a758f0e1c444ae9443dc80902a30de54af09
>
> The whole tree:
>
> https://github.com/dangowrt/linux/commits/for-nvmem-next

Thanks for sharing. However, allow people to review, I suggest you
post a new version with the updated DT bindings included.

The point is, we really need confirmation from the DT maintainers -
otherwise this is simply a no go.

>
> Most comments have been addressed, however, I still depend on using
> either a class_interface *or* adding calls to add/remove the NVMEM
> representation of a block device to block/genhd.c as well as
> block/partitions/core.c, simply because afaik there isn't any better
> way for in-kernel users of block devices to be notified about the
> creation or removal of a block device.

Okay, so that needs further discussions then. I will try to chim in.

[...]

Kind regards
Uffe