From: Lee Jones <lee.jones@linaro.org>
To: Frank Rowand <frowand.list@gmail.com>
Cc: andy.shevchenko@gmail.com, michael@walle.cc, robh+dt@kernel.org,
broonie@kernel.org, devicetree@vger.kernel.org,
linus.walleij@linaro.org, linux@roeck-us.net,
andriy.shevchenko@linux.intel.com, robin.murphy@arm.com,
gregkh@linuxfoundation.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 1/3] mfd: core: Make a best effort attempt to match devices with the correct of_nodes
Date: Wed, 24 Jun 2020 07:41:45 +0100 [thread overview]
Message-ID: <20200624064145.GC954398@dell> (raw)
In-Reply-To: <30f03734-61fd-1b6b-bf11-21b6423a7c50@gmail.com>
On Tue, 23 Jun 2020, Frank Rowand wrote:
> On 2020-06-11 14:10, Lee Jones wrote:
> > Currently, when a child platform device (sometimes referred to as a
> > sub-device) is registered via the Multi-Functional Device (MFD) API,
> > the framework attempts to match the newly registered platform device
> > with its associated Device Tree (OF) node. Until now, the device has
> > been allocated the first node found with an identical OF compatible
> > string. Unfortunately, if there are, say for example '3' devices
> > which are to be handled by the same driver and therefore have the same
> > compatible string, each of them will be allocated a pointer to the
> > *first* node.
>
> As you mentioned elsewhere in this thread, this series "fixes" the
> problem related to the "stericsson,ab8500-pwm" compatible.
>
> I know, I said I would drop discussion of that compatible, but bear
> with me for a second. :-)
>
> The "problem" is that the devices for multiple mfd child nodes with
> the same compatible value of "stericsson,ab8500-pwm" will all have
> a pointer to the first child node. At the moment the same child
> of_node being used by more than one device does not cause any
> incorrect behavior.
>
> Just in case the driver for "stericsson,ab8500-pwm" is modified
> in a way that the child of_node needs to be distinct for each
> device, and that changes gets back ported, it would be useful
> to have Fixes: tags for this patch series.
>
> So, at your discretion (and I'll let you worry about the correct
> Fixes: tag format), this series fixes:
>
> bad76991d7847b7877ae797cc79745d82ffd9120 mfd: Register ab8500 devices using the newly DT:ed MFD API
This patch isn't actually broken.
The issue is the DTB, which [0] addresses.
[0]
https://lkml.kernel.org/lkml/20200622083432.1491715-1-lee.jones@linaro.org/
> c94bb233a9fee3314dc5d9c7de9fa702e91283f2 mfd: Make MFD core code Device Tree and IRQ domain aware
It sounds reasonable to list this one, thanks.
--
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
Follow Linaro: Facebook | Twitter | Blog
next prev parent reply other threads:[~2020-06-24 6:41 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-11 19:10 [PATCH v2 1/3] mfd: core: Make a best effort attempt to match devices with the correct of_nodes Lee Jones
2020-06-11 19:10 ` [PATCH v2 2/3] mfd: core: Fix formatting of MFD helpers Lee Jones
2020-06-12 12:27 ` Frank Rowand
2020-06-11 19:10 ` [PATCH v2 3/3] mfd: core: Add OF_MFD_CELL_REG() helper Lee Jones
2020-06-12 12:28 ` Frank Rowand
2020-06-12 12:26 ` [PATCH v2 1/3] mfd: core: Make a best effort attempt to match devices with the correct of_nodes Frank Rowand
2020-06-15 1:19 ` Frank Rowand
2020-06-15 9:26 ` Lee Jones
2020-06-18 17:34 ` Frank Rowand
2020-06-22 8:50 ` Lee Jones
2020-06-22 14:32 ` Frank Rowand
2020-06-22 14:35 ` Frank Rowand
2020-06-22 15:10 ` Lee Jones
2020-06-22 18:01 ` Frank Rowand
2020-06-22 18:04 ` Frank Rowand
2020-06-22 19:11 ` Lee Jones
2020-06-22 22:23 ` Frank Rowand
2020-06-23 1:17 ` Frank Rowand
2020-06-23 1:37 ` Frank Rowand
2020-06-23 6:47 ` Lee Jones
2020-06-23 17:55 ` Frank Rowand
2020-06-23 19:59 ` Lee Jones
2020-06-23 22:33 ` Frank Rowand
2020-06-24 7:46 ` Lee Jones
2020-06-24 15:51 ` Frank Rowand
2020-06-24 16:14 ` Lee Jones
2020-06-24 16:25 ` Frank Rowand
2020-06-22 8:09 ` Lee Jones
2020-06-22 16:09 ` Frank Rowand
2020-06-22 16:53 ` Lee Jones
2020-06-23 22:21 ` Frank Rowand
2020-06-24 6:45 ` Lee Jones
2020-06-23 23:03 ` Frank Rowand
2020-06-24 6:41 ` Lee Jones [this message]
2020-06-24 7:47 ` Michael Walle
2020-06-24 8:23 ` Lee Jones
2020-06-24 9:19 ` Michael Walle
2020-06-24 11:24 ` Lee Jones
2020-06-11 19:12 Lee Jones
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