linux-kernel - RE: [PATCH] extcon: ptn5150: add usb role class support

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Message-ID: <VI1PR04MB4333288983F7C857DADB8CE589F29@VI1PR04MB4333.eurprd04.prod.outlook.com>
Date:   Tue, 19 Apr 2022 10:00:36 +0000
From:   Jun Li <jun.li@....com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
CC:     "myungjoo.ham@...sung.com" <myungjoo.ham@...sung.com>,
        "cw00.choi@...sung.com" <cw00.choi@...sung.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Frank Li <frank.li@....com>, Xu Yang <xu.yang_2@....com>
Subject: RE: [PATCH] extcon: ptn5150: add usb role class support



> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Sent: Tuesday, April 19, 2022 5:52 PM
> To: Jun Li <jun.li@....com>
> Cc: myungjoo.ham@...sung.com; cw00.choi@...sung.com;
> linux-kernel@...r.kernel.org; Frank Li <frank.li@....com>; Xu Yang
> <xu.yang_2@....com>
> Subject: Re: [PATCH] extcon: ptn5150: add usb role class support
> 
> On 19/04/2022 11:12, Krzysztof Kozlowski wrote:
> > On 19/04/2022 10:51, Jun Li wrote:
> >> My test config is making USB_ROLE_SWITCH=m, but PTN5150=y
> >>
> >> So with below header file:
> >>
> >> #if IS_ENABLED(CONFIG_USB_ROLE_SWITCH)
> >> void usb_role_switch_put(struct usb_role_switch *sw); #else static
> >> inline void usb_role_switch_put(struct usb_role_switch *sw) { }
> >> #endif
> >>
> >> Will have link error.
> >
> > Yep, true. I cannot remember the solution for that... With the select
> > you cannot disable USB_ROLE_SWITCH. With "depends on X || depends on
> > !X", one still cannot disable USB_ROLE_SWITCH. However this is a
> > common problem and I am pretty sure people were working on this. :)
> 
> Use:
> depends on USB_ROLE_SWITCH || !USB_ROLE_SWITCH'
> 
> this should solve the problem.

This works, thanks for the review and suggestion, I will send out v3.

Li Jun
> 
> Best regards,
> Krzysztof