From: Wolfram Sang <wsa@the-dreams.de>
To: Jean Delvare <jdelvare@suse.de>
Cc: Wolfram Sang <wsa+renesas@sang-engineering.com>,
linux-i2c@vger.kernel.org, Guenter Roeck <linux@roeck-us.net>,
linux-renesas-soc@vger.kernel.org
Subject: Re: [RFC] i2c-stub: make it usable with DT when booting
Date: Thu, 18 May 2017 11:30:54 +0200 [thread overview]
Message-ID: <20170518093054.GA2740@katana> (raw)
In-Reply-To: <20170518105253.058a90a6@endymion>
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Hi Jean,
> I get the idea and I understand the need to emulate the devices early
> in the boot process. However, how do you deal with the I2C devices
> pre-initialization (setting initial register values)? This is typically
> done in user-space with the i2c-stub-from-dump script, or manual calls
> to i2cset, but that would be too late in your case, wouldn't it?
Yes. In my case, all 0 memory is fine. I needed to check writes which
were enabling "channels" allowing me to do further initialization.
I see the point, though, that we likely want to address your question
before going upstream.
> Code looks sane, but I can't comment on the bindings side of things as
> this isn't my area.
Sure, thanks for checking the code!
Regards,
Wolfram
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prev parent reply other threads:[~2017-05-18 9:30 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-16 11:27 [RFC] i2c-stub: make it usable with DT when booting Wolfram Sang
2017-05-18 8:52 ` Jean Delvare
2017-05-18 9:30 ` Wolfram Sang [this message]
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