linux-kernel - Re: [PATCH] regmap: Allow read_reg

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Date:	Tue, 30 Sep 2014 23:03:58 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Dan Murphy <dmurphy@...com>, broonie@...nel.org,
	gregkh@...uxfoundation.org
CC:	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCH] regmap: Allow read_reg_mask to be 0

On 09/30/2014 06:07 PM, Dan Murphy wrote:
> There may be spi devices that do not require a
> register read mask to read the registers.
>
> Currently the code sets the read mask based on
> a non-zero value passed in from the driver or if that
> value is 0 sets the read mask to 0x80.

It only sets it to the bus default if both read_flag_mask and 
write_flag_mask are 0. The assumption is that both of them being zero is a 
invalid configuration and either of them (or both) have to be non-zero for 
proper operation, since otherwise the device can't tell the difference 
between a read and a write.

Do you have a device where both the read and the write mask is 0?

- Lars
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