linux-kernel - Re: [PATCH v2 2/5] mfd: lochnagar: Add support for the Cirrus Logic Lochnagar

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Date:   Thu, 25 Oct 2018 14:47:59 +0100
From:   Richard Fitzgerald <rf@...nsource.cirrus.com>
To:     Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Lee Jones <lee.jones@...aro.org>
CC:     <mturquette@...libre.com>, <sboyd@...nel.org>,
        <broonie@...nel.org>, <linus.walleij@...aro.org>,
        <robh+dt@...nel.org>, <mark.rutland@....com>,
        <lgirdwood@...il.com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <patches@...nsource.cirrus.com>,
        <linux-clk@...r.kernel.org>, <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH v2 2/5] mfd: lochnagar: Add support for the Cirrus Logic
 Lochnagar

On 25/10/18 14:20, Charles Keepax wrote:
> On Thu, Oct 25, 2018 at 01:49:05PM +0100, Charles Keepax wrote:
>> On Thu, Oct 25, 2018 at 12:42:05PM +0100, Lee Jones wrote:
>>> On Thu, 25 Oct 2018, Richard Fitzgerald wrote:
>>>> On 25/10/18 09:26, Charles Keepax wrote:
>>>>> On Thu, Oct 25, 2018 at 08:44:59AM +0100, Lee Jones wrote:
>>>>>> On Mon, 08 Oct 2018, Charles Keepax wrote:
>>>>>>> From: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
>>>>> I really feel this isn't the driver you are objecting to as such
>>>>> but the way regmap operates and also we seem to always have the same
>>>>> discussions around regmap every time we push a driver.
>>>
>>> Absolutely.  I didn't like it before.  I like it even less now.
>>>
>>
>> I guess the question from my side becomes do you want to block
>> this driver pending on major refactoring to regmap? I will have a
>> think about what I can do but its going to affect a LOT of drivers.
>>
> 
> Actually one more thought, perhaps as a halfway for now i could
> look into removing the readables

Be careful with that, there are some addresses that are illegal to
access. What does regmap debugfs do if you don't have a readables
list? Just reading a debugfs shouldn't be able to kill the hardware.
You might need to add a precious list which is more error prone
than listing the valid readables we are using.

  and defaults. We lose some things
> like error checking that we are reading real registers but as
> this driver doesnt currently do cache syncs we might be able to
> get away with this for now.
> 
> Unless anyone strenuously objects i will have a look at the
> options there. As well as looking at wider refactoring but aiming
> further out.
> 
> Thanks,
> Charles
>