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

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Date:   Tue, 19 Apr 2022 11:12:58 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Jun Li <jun.li@....com>
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

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. :)

Best regards,
Krzysztof