From: Wolfram Sang <wsa@the-dreams.de>
To: Wolfram Sang <wsa+renesas@sang-engineering.com>
Cc: linux-i2c@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
linux-i3c@lists.infradead.org,
"Kieran Bingham" <kieran@ksquared.org.uk>,
"Niklas Söderlund" <niklas.soderlund@ragnatech.se>,
"Luca Ceresoli" <luca@lucaceresoli.net>,
"Jacopo Mondi" <jacopo@jmondi.org>,
"Laurent Pinchart" <laurent.pinchart@ideasonboard.com>,
"Vladimir Zapolskiy" <vz@mleia.com>,
linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH v2 0/6] i2c: of: reserve unknown and ancillary addresses
Date: Wed, 15 Apr 2020 10:27:12 +0200 [thread overview]
Message-ID: <20200415082712.GD1141@ninjato> (raw)
In-Reply-To: <20200318150059.21714-1-wsa+renesas@sang-engineering.com>
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Status update on this series:
> TODO: make sure there are no concurrency issues in patch 6 when handling
> the struct i2c_client.
This turns out to be annoying. How to make sure that we don't modify the
i2c_client while the adapter it is sitting on just gets removed. AFAICS
we need a new locking scheme just for that and I am not convinced this
is the way forward.
Also, there is still this small room for regressing when there are DTs
having multiple addresses specified in the DT and the drivers use
i2c_new_dummy_client on these addresses. I have verified that no in-tree
users of i2c_new_dummy (and friends) do work on extra addresses but
still I'd like to completely avoid this potential regression.
One solution to both problems would be to unregister the reserved device
when its address is requested. I am working on this prototype currently.
However, I am not sure yet if one issue might make this approach messy:
re-registering the reserved device when the probe of the requested
address fails.
We will see...
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next prev parent reply other threads:[~2020-04-15 8:27 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-18 15:00 [RFC PATCH v2 0/6] i2c: of: reserve unknown and ancillary addresses Wolfram Sang
2020-03-18 15:00 ` [RFC PATCH v2 1/6] i2c: use DEFINE for the dummy driver name Wolfram Sang
2020-04-15 8:09 ` Kieran Bingham
2020-03-18 15:00 ` [RFC PATCH v2 2/6] i2c: allow DT nodes without 'compatible' Wolfram Sang
2020-04-10 13:49 ` Luca Ceresoli
2020-04-15 7:59 ` Wolfram Sang
2020-04-15 8:07 ` Kieran Bingham
2020-04-15 8:16 ` Wolfram Sang
2020-04-15 8:38 ` Kieran Bingham
2020-04-16 14:53 ` Luca Ceresoli
2020-04-15 8:48 ` Kieran Bingham
2020-04-15 9:46 ` Wolfram Sang
2020-03-18 15:00 ` [RFC PATCH v2 3/6] i2c: of: remove superfluous parameter from exported function Wolfram Sang
2020-03-19 12:41 ` Boris Brezillon
2020-04-15 8:13 ` Kieran Bingham
2020-03-18 15:00 ` [RFC PATCH v2 4/6] i2c: of: error message unification Wolfram Sang
2020-04-10 17:02 ` Luca Ceresoli
2020-04-15 8:17 ` Kieran Bingham
2020-04-15 8:50 ` Kieran Bingham
2020-03-18 15:00 ` [RFC PATCH v2 5/6] i2c: of: mark a whole array of regs as reserved Wolfram Sang
2020-04-10 17:05 ` Luca Ceresoli
2020-04-13 9:55 ` Luca Ceresoli
2020-04-15 8:10 ` Wolfram Sang
2020-04-15 10:07 ` Luca Ceresoli
2020-03-18 15:00 ` [RFC PATCH v2 6/6] i2c: core: hand over reserved devices when requesting ancillary addresses Wolfram Sang
2020-04-15 10:07 ` Luca Ceresoli
2020-03-28 3:50 ` [RFC PATCH v2 0/6] i2c: of: reserve unknown and " Wolfram Sang
2020-04-15 8:27 ` Wolfram Sang [this message]
2020-04-15 8:35 ` Kieran Bingham
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