From: Vaibhav Hiremath <vaibhav.hiremath-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
To: Shubhrajyoti Datta
<shubhrajyoti.datta-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Wolfram Sang <wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org>,
Yi Zhang <yizhang-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
robert.jarzmik-GANU6spQydw@public.gmane.org
Subject: Re: [PATCH-v5 2/5] i2c: pxa: enable/disable i2c module across msg xfer
Date: Wed, 05 Aug 2015 18:12:09 +0530 [thread overview]
Message-ID: <55C204A1.3060206@linaro.org> (raw)
In-Reply-To: <CAKfKVtGzDjgHzy70aa0d2W=ROMcxVzerg-qpuB9e4PaGKPpMTQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
On Wednesday 05 August 2015 04:16 PM, Shubhrajyoti Datta wrote:
> hi ,
> On Tue, Jul 21, 2015 at 6:11 PM, Vaibhav Hiremath
> <vaibhav.hiremath-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org> wrote:
>> From: Yi Zhang <yizhang-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>
>>
>> Enable i2c module/unit before transmission and disable when it
>> finishes.
>>
>> why?
>> It's because the i2c bus may be disturbed if the slave device,
>> typically a touch, powers on.
>
> Why should that be an issue?
> Is it an errata.
>
Not I am aware of.
> In which mode it is an issue slave / master or both?
>
since it talks about touch, I expect it to be master mode.
Thanks,
Vaibhav
next prev parent reply other threads:[~2015-08-05 12:42 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-21 12:41 [PATCH-v5 0/5] i2c: pxa: Add support for PXA910 family of device Vaibhav Hiremath
2015-07-21 12:41 ` [PATCH-v5 1/5] Documentation: binding: add new property 'disable_after_xfer' to i2c-pxa Vaibhav Hiremath
2015-07-27 14:09 ` Matt Porter
2015-08-05 6:34 ` Vaibhav Hiremath
2015-08-05 8:49 ` Wolfram Sang
2015-08-05 9:41 ` Vaibhav Hiremath
2015-08-05 14:24 ` Matt Porter
[not found] ` <55C1AE71.3010700-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-08-05 14:20 ` Matt Porter
2015-08-05 14:24 ` Vaibhav Hiremath
2015-07-21 12:41 ` [PATCH-v5 2/5] i2c: pxa: enable/disable i2c module across msg xfer Vaibhav Hiremath
[not found] ` <1437482466-16126-3-git-send-email-vaibhav.hiremath-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-08-05 10:46 ` Shubhrajyoti Datta
[not found] ` <CAKfKVtGzDjgHzy70aa0d2W=ROMcxVzerg-qpuB9e4PaGKPpMTQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-08-05 12:42 ` Vaibhav Hiremath [this message]
2015-07-21 12:41 ` [PATCH-v5 3/5] i2c: pxa: Add support for pxa910/988 & new configuration features Vaibhav Hiremath
2015-07-21 12:41 ` [PATCH-v5 4/5] Documentation: binding: add sclk adjustment properties to i2c-pxa Vaibhav Hiremath
[not found] ` <1437482466-16126-5-git-send-email-vaibhav.hiremath-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-07-27 14:11 ` Matt Porter
2015-08-05 6:29 ` Vaibhav Hiremath
2015-07-21 12:41 ` [PATCH-v5 5/5] i2c: pxa: Add ILCR (tLow & tHigh) configuration support Vaibhav Hiremath
[not found] ` <1437482466-16126-6-git-send-email-vaibhav.hiremath-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-08-05 8:51 ` Vaibhav Hiremath
[not found] ` <55C1CE8E.9000601-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-08-05 19:11 ` Robert Jarzmik
2015-08-06 5:45 ` Vaibhav Hiremath
2015-08-09 12:18 ` Robert Jarzmik
2015-08-09 16:53 ` Vaibhav Hiremath
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