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

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Date:   Fri, 21 Jul 2017 10:00:29 +0800
From:   Jianhong Chen <chenjh@...k-chips.com>
To:     Heiko Stübner <heiko@...ech.de>
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



在 2017/6/29 18:29, Heiko Stübner 写道:

> 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
>

Hi, Heiko:

      I have moved gpio-rk805.c to drivers/pinctrl/pinctrl-rk805.c, this 
driver is also designed for rk816 or furture PMICs to extend.
      RK816 is not in our team's plan at this porting, it will be added 
at next time, so I don't directly provide rk816 in this driver. I will 
add more descriptions in commit message to express my design purpose.

      Are you agreed ?  If so, I will send [PATCH v7] today.


-- 
Best Regards
----------------------------------------------------------------------------
陈健洪 (Joseph Chen)
E-mail：chenjh@...k-chips.com
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