linux-kernel - Re: [PATCH v2 1/3] gpio: regmap: Support few IC specific operations

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Date:   Fri, 21 May 2021 10:25:19 +0000
From:   "Vaittinen, Matti" <Matti.Vaittinen@...rohmeurope.com>
To:     "andy.shevchenko@...il.com" <andy.shevchenko@...il.com>,
        "michael@...le.cc" <michael@...le.cc>
CC:     linux-power <linux-power@...rohmeurope.com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "bgolaszewski@...libre.com" <bgolaszewski@...libre.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>
Subject: Re: [PATCH v2 1/3] gpio: regmap: Support few IC specific operations


On Fri, 2021-05-21 at 12:19 +0200, Michael Walle wrote:
> Am 2021-05-21 12:09, schrieb Andy Shevchenko:
> > On Fri, May 21, 2021 at 12:53 PM Matti Vaittinen
> > <matti.vaittinen@...rohmeurope.com> wrote:
> > > Changelog v2: (based on suggestions by Michael Walle)
> > >   - drop gpio_regmap_set_drvdata()
> > 
> > But why do we have gpio_regmap_get_drvdata() and why is it
> > different
> > now to the new member handling?
> 
> Eg. the reg_mask_xlate() callback is just passed a "struct 
> gpio_regmap*".
> If someone needs to access private data there,
> gpio_regmap_get_drvdata()
> is used. At least that was its intention.

I would help the IC driver here too and just directly provide the
drvdata pointer as argument. I don't see much value in providing the
regmap_gpio pointer as IC driver can not dereference it.

> 
> Thus I was also suggesting to use "struct gpio_regmap*" in the newer
> callbacks.
> 
> I don't get what you mean by "different to the new member handling"?
> 
> -michael