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From: Wolfram Sang <wsa@the-dreams.de>
To: Luca Ceresoli <luca@lucaceresoli.net>
Cc: "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
	<devicetree@vger.kernel.org>,
	"Kieran Bingham" <kieran@ksquared.org.uk>,
	"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
	"Jacopo Mondi" <jacopo@jmondi.org>,
	"Vladimir Zapolskiy" <vz@mleia.com>,
	Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
	"Wolfram Sang" <wsa+renesas@sang-engineering.com>,
	"Geert Uytterhoeven" <geert@linux-m68k.org>,
	"Linux I2C" <linux-i2c@vger.kernel.org>,
	"Niklas Söderlund" <niklas.soderlund@ragnatech.se>,
	linux-i3c@lists.infradead.org,
	"Laurent Pinchart" <laurent.pinchart@ideasonboard.com>
Subject: Re: [RFC PATCH 7/7] i2c: core: hand over reserved devices when requesting ancillary addresses
Date: Thu, 12 Mar 2020 12:30:43 +0100
Message-ID: <20200312113042.GD1013@ninjato> (raw)
In-Reply-To: <dc831357-8545-6f6e-71a2-bef282e0bd94@lucaceresoli.net>

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> >> +               strlcpy(reserved_client->name, I2C_DUMMY_DRV_NAME, sizeof(client->name));
> 
> Any strong reason for not giving the device a more informative name?

Yes, sadly...

> Reading "dummy" in several /sys/bus/i2c/devices/?-????/name files is not
> helping. Using the 'name' string that is passed to
> i2c_new_ancillary_device() would be way better, perhaps prefixed by
> dev->name. But this opens the question of why not doing it in

... I never liked the plain "dummy" name as well. However, because
'name' is what we need to bind to a driver we can't have a more
descriptive or run-time generated name at that place.

> i2c_new_dummy_device() as well, which currently receives no "name"
> parameter.

I thought about it but discarded the idea because then you still have
no connection to the driver which created the dummy device. My
favourite idea so far is to advertise i2c_new_ancillary_device() instead
of i2c_new_dummy_device(), because there we already have access to the
client structure. With that, we could add another link in sysfs to the
main address and vice-versa.

> Of course this is not strictly related to this patch and can be done in
> a later step.

Exactly.


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Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-20 17:23 [RFC PATCH 0/7] i2c: of: reserve unknown and " Wolfram Sang
2020-02-20 17:23 ` [RFC PATCH 1/7] i2c: add sanity check for parameter of i2c_verify_client() Wolfram Sang
2020-02-21  9:36   ` Geert Uytterhoeven
2020-02-20 17:23 ` [RFC PATCH 2/7] i2c: use DEFINE for the dummy driver name Wolfram Sang
2020-02-21  9:38   ` Geert Uytterhoeven
2020-02-20 17:23 ` [RFC PATCH 3/7] i2c: allow DT nodes without 'compatible' Wolfram Sang
2020-02-21  9:45   ` Geert Uytterhoeven
2020-02-21  9:48     ` Geert Uytterhoeven
2020-02-23 23:11     ` Luca Ceresoli
2020-03-12 11:19       ` Wolfram Sang
2020-03-12 11:44         ` Alexandre Belloni
2020-02-26 16:30   ` Rob Herring
2020-02-20 17:24 ` [RFC PATCH 4/7] i2c: of: remove superfluous parameter from exported function Wolfram Sang
2020-02-21  9:50   ` Geert Uytterhoeven
2020-02-24  8:12   ` Luca Ceresoli
2020-02-20 17:24 ` [RFC PATCH 5/7] i2c: of: error message unification Wolfram Sang
2020-02-21  9:54   ` Geert Uytterhoeven
2020-02-20 17:24 ` [RFC PATCH 6/7] i2c: of: mark a whole array of regs as reserved Wolfram Sang
2020-02-21 10:09   ` Geert Uytterhoeven
2020-03-12 11:21     ` Wolfram Sang
2020-03-18 14:33     ` Wolfram Sang
2020-02-28 12:11   ` Luca Ceresoli
2020-02-20 17:24 ` [RFC PATCH 7/7] i2c: core: hand over reserved devices when requesting ancillary addresses Wolfram Sang
2020-02-21 10:13   ` Geert Uytterhoeven
2020-02-28 12:11     ` Luca Ceresoli
2020-03-12 11:30       ` Wolfram Sang [this message]
2020-03-12 11:21     ` Wolfram Sang
2020-03-13 12:42     ` Wolfram Sang
2020-02-21 10:15 ` [RFC PATCH 0/7] i2c: of: reserve unknown and " Geert Uytterhoeven

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