From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Subject: Re: [RFC PATCH 02/40] soundwire: cadence_master: add debugfs register
 dump
Date: Fri, 26 Jul 2019 10:32:13 -0500
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Cc: alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, tiwai@suse.de, broonie@kernel.org, vkoul@kernel.org, jank@cadence.com, srinivas.kandagatla@linaro.org, slawomir.blauciak@intel.com, Sanyog Kale <sanyog.r.kale@intel.com>
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>> +static const struct file_operations cdns_reg_fops = {
>> +	.open = simple_open,
>> +	.read = cdns_reg_read,
>> +	.llseek = default_llseek,
>> +};
> 
> DEFINE_SHOW_ATTRIBUTE()?

I remember looking at this but can't recall why I left it this way.
That was before my Summer break so will relook, thanks for suggesting this.