From: Wolfram Sang <wsa@the-dreams.de>
To: Simon Horman <horms+renesas@verge.net.au>
Cc: linux-renesas-soc@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Magnus Damm <magnus.damm@gmail.com>,
Wolfram Sang <wsa+renesas@sang-engineering.com>
Subject: Re: [PATCH v2 0/4] ARM: dts: r8a7790: lager: use demuxer for I2C
Date: Mon, 13 Jun 2016 16:31:34 +0200 [thread overview]
Message-ID: <20160613143134.GB1603@katana> (raw)
In-Reply-To: <1465370066-8450-1-git-send-email-horms+renesas@verge.net.au>
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> # ./exercise-i2c-demux.sh
> I2C Demux: i2c-8
> Master: 1:/i2c@e650800
> [ 97.694487] i2c-rcar e6508000.i2c: probed 0 (1)
> Master: 0:/i2c@e650000
> [ 102.706365] i2c-demux-pinctrl i2c-8: failed to setup demux-adapter 0 (-19) 0 (0)
Confirmed :( Got today only this far that the ENODEV comes from the PFC
driver. CONFIG_DEBUG_PINCTRL is a good idea for further debugging
probably.
> 3.1 Unfortunately it fails for the I2C2 dmux if the GPIO fallback is
> present.
Hopefully the same issue.
> 3.2 The test also fails for the I2C3 demux but that appears to be due
> to a shortcoming in the voltage regulator code which does not
> appear to like being reinitialised. The kernel complains as follows:
Yes, the demuxer trigger re-bind cycles which are not well considered
and/or tested. E.g. for soc-camera, this patch needed to go upstream:
https://patchwork.linuxtv.org/patch/32473/
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From: wsa@the-dreams.de (Wolfram Sang)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 0/4] ARM: dts: r8a7790: lager: use demuxer for I2C
Date: Mon, 13 Jun 2016 16:31:34 +0200 [thread overview]
Message-ID: <20160613143134.GB1603@katana> (raw)
In-Reply-To: <1465370066-8450-1-git-send-email-horms+renesas@verge.net.au>
> # ./exercise-i2c-demux.sh
> I2C Demux: i2c-8
> Master: 1:/i2c at e650800
> [ 97.694487] i2c-rcar e6508000.i2c: probed 0 (1)
> Master: 0:/i2c at e650000
> [ 102.706365] i2c-demux-pinctrl i2c-8: failed to setup demux-adapter 0 (-19) 0 (0)
Confirmed :( Got today only this far that the ENODEV comes from the PFC
driver. CONFIG_DEBUG_PINCTRL is a good idea for further debugging
probably.
> 3.1 Unfortunately it fails for the I2C2 dmux if the GPIO fallback is
> present.
Hopefully the same issue.
> 3.2 The test also fails for the I2C3 demux but that appears to be due
> to a shortcoming in the voltage regulator code which does not
> appear to like being reinitialised. The kernel complains as follows:
Yes, the demuxer trigger re-bind cycles which are not well considered
and/or tested. E.g. for soc-camera, this patch needed to go upstream:
https://patchwork.linuxtv.org/patch/32473/
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next prev parent reply other threads:[~2016-06-13 14:31 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-08 7:14 [PATCH v2 0/4] ARM: dts: r8a7790: lager: use demuxer for I2C Simon Horman
2016-06-08 7:14 ` Simon Horman
2016-06-08 7:14 ` [PATCH v2 1/4] ARM: dts: r8a7790: lager: rename i2cexio as i2cexio0 Simon Horman
2016-06-08 7:14 ` Simon Horman
2016-06-08 8:03 ` Wolfram Sang
2016-06-08 8:03 ` Wolfram Sang
2016-06-15 4:08 ` Simon Horman
2016-06-15 4:08 ` Simon Horman
2016-06-08 7:14 ` [PATCH v2 2/4] ARM: dts: r8a7790: lager: use demuxer for IIC1/I2C1 Simon Horman
2016-06-08 7:14 ` Simon Horman
2016-06-13 14:33 ` Wolfram Sang
2016-06-13 14:33 ` Wolfram Sang
2016-06-15 4:12 ` Simon Horman
2016-06-15 4:12 ` Simon Horman
2016-06-08 7:14 ` [PATCH v2 3/4] ARM: dts: r8a7790: lager: use demuxer for IIC2/I2C2 Simon Horman
2016-06-08 7:14 ` Simon Horman
2016-06-08 7:14 ` [PATCH v2 4/4] ARM: dts: r8a7790: lager: use demuxer for IIC3/I2C3 Simon Horman
2016-06-08 7:14 ` Simon Horman
2016-06-08 8:05 ` Wolfram Sang
2016-06-08 8:05 ` Wolfram Sang
2016-06-09 0:55 ` Simon Horman
2016-06-09 0:55 ` Simon Horman
2016-06-13 14:35 ` Wolfram Sang
2016-06-13 14:35 ` Wolfram Sang
2016-06-15 4:29 ` Simon Horman
2016-06-15 4:29 ` Simon Horman
2016-06-15 6:24 ` Wolfram Sang
2016-06-15 6:24 ` Wolfram Sang
2016-06-13 14:31 ` Wolfram Sang [this message]
2016-06-13 14:31 ` [PATCH v2 0/4] ARM: dts: r8a7790: lager: use demuxer for I2C Wolfram Sang
2016-06-14 22:09 ` Wolfram Sang
2016-06-14 22:09 ` Wolfram Sang
2016-06-16 1:26 ` Simon Horman
2016-06-16 1:26 ` Simon Horman
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