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From: Alexandre Belloni <alexandre.belloni@bootlin.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: "Paweł Anikiel" <pan@semihalf.com>,
	jarkko.nikula@linux.intel.com,
	"Andy Shevchenko" <andriy.shevchenko@linux.intel.com>,
	"Mika Westerberg" <mika.westerberg@linux.intel.com>,
	"Rob Herring" <robh+dt@kernel.org>,
	"Philipp Zabel" <p.zabel@pengutronix.de>,
	"Olof Johansson" <olof@lixom.net>, "SoC Team" <soc@kernel.org>,
	"Dinh Nguyen" <dinguyen@kernel.org>,
	"Pratyush Yadav" <p.yadav@ti.com>,
	"Tudor Ambarus" <Tudor.Ambarus@microchip.com>,
	"Linux I2C" <linux-i2c@vger.kernel.org>,
	"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
	"Sebastian Reichel" <sre@kernel.org>,
	"Leizhen (ThunderTown)" <thunder.leizhen@huawei.com>,
	"Jonathan Cameron" <Jonathan.Cameron@huawei.com>,
	DTML <devicetree@vger.kernel.org>,
	"Linux ARM" <linux-arm-kernel@lists.infradead.org>,
	ka@semihalf.com, "Tomasz Nowicki" <tn@semihalf.com>,
	jam@semihalf.com, amstan@google.com
Subject: Re: [PATCH v2 2/4] dt-bindings: add bus number property
Date: Tue, 5 Oct 2021 18:28:16 +0200	[thread overview]
Message-ID: <YVx9IMk7cJSCK79/@piout.net> (raw)
In-Reply-To: <CAK8P3a1kj1G3TkM7bK3ckXoG8_PTLURAcpDRmDxdnjutEPMsug@mail.gmail.com>

On 05/10/2021 18:22:12+0200, Arnd Bergmann wrote:
> On Tue, Oct 5, 2021 at 4:37 PM Paweł Anikiel <pan@semihalf.com> wrote:
> >
> > On SoCFPGA systems, it's desireable to have fixed numbering for
> > i2c busses, while being able to enable/disable them (e.g. have i2c1
> > be mapped to /dev/i2c-1, even though i2c0 is disabled). This can also
> > be achieved using devicetree aliases (see i2c_add_adapter). However,
> > having the driver be self-contained without relying on aliases is more
> > robust.
> >
> > Signed-off-by: Paweł Anikiel <pan@semihalf.com>
> 
> I don't see how adding a nonstandard property in one of the i2c bus
> drivers helps at all. How do you expect this to work when there are
> multiple i2c controllers in the system using different drivers? What
> should happen if both an alias and the busno property are set?
> 

What happens when two nodes have the same busno property because e.g.
one is in a dtsi and the other one is in a dts?


-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

  reply	other threads:[~2021-10-05 16:31 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-05 14:37 [PATCH v2 0/4] Add support for the Mercury+ AA1 module Paweł Anikiel
2021-10-05 14:37 ` [PATCH v2 1/4] i2c: check bus number property in DesignWare I2C Controller Paweł Anikiel
2021-10-05 16:19   ` Andy Shevchenko
2021-10-05 14:37 ` [PATCH v2 2/4] dt-bindings: add bus number property Paweł Anikiel
2021-10-05 16:22   ` Arnd Bergmann
2021-10-05 16:28     ` Alexandre Belloni [this message]
2021-10-06  9:29       ` Paweł Anikiel
     [not found]       ` <CAF9_jYT6mbk6dr8=ZYZ8B=gxnuHas7QBfDfuoTJnMzSKZt=WGw@mail.gmail.com>
2021-10-06  9:41         ` Arnd Bergmann
2021-10-05 14:37 ` [PATCH v2 3/4] reset: socfpga: add empty driver allowing consumers to probe Paweł Anikiel
2021-10-05 14:37 ` [PATCH v2 4/4] dts: socfpga: Add Mercury+ AA1 devicetree Paweł Anikiel
     [not found] ` <20211005143746.xE5rCkt-P_XlNkn9bJ8ZqYPY4nQQ7doqzSd4FrAlICY@z>
2021-10-14 16:46   ` [PATCH v2 2/4] dt-bindings: add bus number property Rob Herring

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