From: Guenter Roeck <linux@roeck-us.net>
To: Mark Brown <broonie@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-kernel@vger.kernel.org, Nishanth Menon <nm@ti.com>
Subject: Re: [RFT PATCH] regmap-i2c: Only use I2C_FUNC_I2C if val_bits == 8
Date: Sat, 25 Jun 2016 08:09:44 -0700 [thread overview]
Message-ID: <576E9EB8.4080100@roeck-us.net> (raw)
In-Reply-To: <20160625113409.GA28202@sirena.org.uk>
On 06/25/2016 04:34 AM, Mark Brown wrote:
> On Fri, Jun 24, 2016 at 07:53:53PM -0700, Guenter Roeck wrote:
>
>> On chips with a register value size of 16 bits, I2C block reads will
>> typically not return the expected values. Instead, returned values
>> are most likely undefined if an operation crosses a register boundary.
>
> No, this just isn't true in general - if a device has trouble with bulk
> reads it needs to set use_sigle_rw in the config to disable them.
> Device limitations with bulk reads are a per device thing and are
> orthogonal to the value size, being more to do with the age and quality
> of the register map implementation than anything else.
>
Ok, thanks for letting me know. I'll try that.
Guenter
prev parent reply other threads:[~2016-06-25 15:09 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-25 2:53 Guenter Roeck
2016-06-25 11:34 ` Mark Brown
2016-06-25 15:09 ` Guenter Roeck [this message]
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