linux-kernel - Re: [PATCH] arm64: dts: marvell: add unique identifiers for Armada A8k SPI controllers

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Message-ID: <20161108174851.2cd8efb4@free-electrons.com>
Date:   Tue, 8 Nov 2016 17:48:51 +0100
From:   Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:     Marcin Wojtas <mw@...ihalf.com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        sebastian.hesselbarth@...il.com, andrew@...n.ch,
        jason@...edaemon.net, gregory.clement@...e-electrons.com,
        will.deacon@....com, robh+dt@...nel.org, mark.rutland@....com,
        nadavh@...vell.com, alior@...vell.com, jaz@...ihalf.com,
        tn@...ihalf.com
Subject: Re: [PATCH] arm64: dts: marvell: add unique identifiers for Armada
 A8k SPI controllers

Hello,

On Tue,  8 Nov 2016 17:31:32 +0100, Marcin Wojtas wrote:
> Enabling SPI controllers, which are attached to different busses
> inside an SoC, may result in overlapping enumeration and cause
> sysfs registration failure. Example log after enabling two
> controllers on Armada 8040 SoC with same identifiers:
> 
> [    3.740415] sysfs: cannot create duplicate filename
> '/class/spi_master/spi0'
> [    3.747510] ------------[ cut here ]------------
> [    3.752145] WARNING: at fs/sysfs/dir.c:31
> [...]
> [    4.002299] orion_spi: probe of f4700600.spi failed with error -17
> 
> spi-orion driver offers dedicated DT property ('cell-index'), that
> allow setting unique identifiers. Recently added support for CP110-slave
> HW block introduced two new SPI controllers' nodes with same ID as
> ones from CP110-master.
> 
> This commit fixes the issue by assigning different 'cell-index' values
> for CP110-slave SPI controllers.
> 
> Fixes: 4eef78a0091b ("arm64: dts: marvell: add description for the slave
> CP110 in Armada 8K")
> Signed-off-by: Marcin Wojtas <mw@...ihalf.com>

It's sad that we need to hardcode those indexes in the Device Tree
(which by no means are a description of the HW by the way), but that's
what the SPI framework expects I believe. Therefore:

Acked-by: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com