linux-kernel - Re: [PATCH v2 08/10] hikey960: Support usb functionality of Hikey960

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Date:   Sat, 2 Mar 2019 09:02:51 +0800
From:   Chen Yu <chenyu56@...wei.com>
To:     Chunfeng Yun <chunfeng.yun@...iatek.com>
CC:     <liuyu712@...ilicon.com>, <linux-usb@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <john.stultz@...aro.org>, <suzhuangluan@...ilicon.com>,
        <kongfei@...ilicon.com>, <wanghu17@...ilicon.com>,
        <butao@...ilicon.com>, <chenyao11@...wei.com>,
        <fangshengzhou@...ilicon.com>, <lipengcheng8@...wei.com>,
        <songxiaowei@...ilicon.com>, <xuyiping@...ilicon.com>,
        <xuyoujun4@...wei.com>, <yudongbin@...ilicon.com>,
        <zangleigang@...ilicon.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Binghui Wang <wangbinghui@...ilicon.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Subject: Re: [PATCH v2 08/10] hikey960: Support usb functionality of Hikey960

Hi Chunfeng Yun,

On 2019/2/22 15:32, Chunfeng Yun wrote:
> On Tue, 2019-02-19 at 11:20 +0800, Chen Yu wrote:
>> Hi,
>>
>> On 2019/2/19 10:50, Chunfeng Yun wrote:
>>>> +	if (ret)
>>>> +		hisi_hikey_usb->typec_vbus_enable_val = 1;
>>>> +
>>>> +	hisi_hikey_usb->typec_vbus = devm_gpiod_get(dev, "typec-vbus",
>>>> +			hisi_hikey_usb->typec_vbus_enable_val ?
>>>> +			GPIOD_OUT_LOW : GPIOD_OUT_HIGH);
>>>> +	if (!hisi_hikey_usb->typec_vbus)
>>>> +		return -ENOENT;
>>>> +	else if (IS_ERR(hisi_hikey_usb->typec_vbus))
>>>> +		return PTR_ERR(hisi_hikey_usb->typec_vbus);
>>>> +
>>>> +	gpiod_direction_output(hisi_hikey_usb->typec_vbus,
>>>> +			!hisi_hikey_usb->typec_vbus_enable_val);
>>> maybe a simple way if use fixed regulator?
>>>
>> The hardware of the Hikey960 board has been fixed, and the type-c
>> port can act as UFP. So it is better to close the vbus when Hikey960
>> connect to host(e.g PC).
> I guess you misunderstand what I mean?
> Please refer to bindings/regulator/fixed-regulator.txt
> If you control vbus by gpio, you can use fixed-regulator, it will be
> easy to make compatible with other cases, think about using a LDO to
> control vbus
Sorry for misunderstanding the fixed-regulator and thanks for your advice!
I have read bindings/regulator/fixed-regulator.txt and I think it is enough
to use gpiod API right now.
>>>> +
>>>> +	hisi_hikey_usb->otg_switch = devm_gpiod_get(dev, "otg-switch", GPIOD_IN);
>>>> +	if (!hisi_hikey_usb->otg_switch)
>>>> +		return -ENOENT;
>>>> +	else if (IS_ERR(hisi_hikey_usb->otg_switch))
>>>> +		return PTR_ERR(hisi_hikey_usb->otg_switch);
>>>> +
>>>> +	gpiod_direction_output(hisi_hikey_usb->otg_switch, USB_SWITCH_TO_HUB);
>>>> +
>>>> +	/* hub-vdd33-en is optional */
>>>> +	hisi_hikey_usb->hub_vbus = devm_gpiod_get(dev, "hub-vdd33-en",
>>>> +			GPIOD_OUT_LOW);
>>>> +	if (IS_ERR(hisi_hikey_usb->hub_vbus))
>>>> +		return PTR_ERR(hisi_hikey_usb->hub_vbus);
>>>> +
>>>> +	gpiod_direction_output(hisi_hikey_usb->hub_vbus, HUB_VBUS_POWER_ON);
>>> ditto
>>>> +
>>>> +	hisi_hikey_usb->role_sw = usb_role_switch_get(dev);
>>>> +	if (!hisi_hikey_usb->role_sw)
>>>> +		return -EPROBE_DEFER;
>>>> +	else if (IS_ERR(hisi_hikey_usb->role_sw))
>>>> +		return PTR_ERR(hisi_hikey_usb->role_sw);
>>>> +
>>
>> Thanks
>> Yu Chen
>>
> 

Thanks
Yu Chen