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

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Message-ID: <42d019a1-7cb7-d9fb-c974-ce54ccdce5eb@linaro.org>
Date:   Tue, 19 Apr 2022 11:52:13 +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 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.

Best regards,
Krzysztof