linux-kernel - Re: [PATCH v6 08/12] gpio: Add GPIO driver for the RK805 PMIC

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Date:   Thu, 29 Jun 2017 12:29:10 +0200
From:   Heiko Stübner <heiko@...ech.de>
To:     Jianhong Chen <chenjh@...k-chips.com>
Cc:     linux-rockchip@...ts.infradead.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Tao Huang <huangtao@...k-chips.com>,
        Alexandre Courbot <gnurou@...il.com>, zhangqing@...k-chips.com,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Mark Brown <broonie@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>, tony.xie@...k-chips.com,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        Linux Input <linux-input@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>, w.egorov@...tec.de
Subject: Re: [PATCH v6 08/12] gpio: Add GPIO driver for the RK805 PMIC

Hi,

Am Mittwoch, 14. Juni 2017, 20:11:06 CEST schrieb Jianhong Chen:
> 在 2017/6/9 20:17, Heiko Stuebner 写道:
> > Am Freitag, 9. Juni 2017, 13:37:26 CEST schrieb Linus Walleij:
> >> Heiko, can you please look at this patch.
> >> 
> >> On Thu, Jun 8, 2017 at 9:30 AM, Jianhong Chen <chenjh@...k-chips.com> 
wrote:
> >>> From: chenjh <chenjh@...k-chips.com>
> >> 
> >> Full name please.
> > 
> > git config --global user.name "John Doe"
> > 
> > might do the and make this permanent for all your commits :-)
> > 
> >>> RK805 has two configurable GPIOs that can be used for several
> >>> purposes. These are output only.
> >>> 
> >>> This driver is generic for other Rockchip PMICs to be added.
> >>> 
> >>> Signed-off-by: chenjh <chenjh@...k-chips.com>
> >> 
> >> Dito.
> >> 
> >> Your commit message says they are output-only, yet you implement
> >> .direction_input(). So what is is going to be?
> > 
> > So far, I've only seen the rk808 and rk818. Both do not have any
> > configurable pins.
> > 
> > The rk805 which is a sort of variant of the above, does have the two
> > pins defined below, but in the manual I could also only find them as
> > output-only and having no other function than being output-pins.
> > 
> > So I don't really know if all the input- or "gpio-mode"- handling is only
> > an oversight (copy'n'paste) or if there are yet other rk808 variants
> > around
> > that can actually be configured as inputs or even non-gpio modes?
> > 
> > I hope Jianhong will be able to answer that.
> > 
> > 
> > Heiko
> 
> This driver is not only for rk805, but also intend for rk816 and furtrue
> PMICs.
> The rk816 has one multi function pin(TS/GPIO), when setting as gpio, it
> can be configured as output or input.
> Here is simple description from manual: "Thermistor input. Connect a
> thermistor from this pin to ground. The thermistor is usually inside the
> battery pack. (multi-function for GPIO) ".

As Linus suggested, this sounds like you want a pinctrl driver that 
also handles the gpios.

Ideally you might also directly provide support for this rk816 in the
same patch series, so reviewers can see the full extend of what is
supported.


Heiko