linux-kernel - Re: phy-qcom-usb-hs.c:undefined reference to `extcon_unregister

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Date:   Tue, 07 Mar 2017 08:01:23 -0800
From:   Stephen Boyd <stephen.boyd@...aro.org>
To:     kbuild test robot <fengguang.wu@...el.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Kishon Vijay Abraham I <kishon@...com>
Subject: Re: phy-qcom-usb-hs.c:undefined reference to `extcon_unregister_notifier'

Quoting kbuild test robot (2017-03-06 09:19:50)
> Hi Stephen,
> 
> FYI, the error/warning still remains.
> 
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   c1ae3cfa0e89fa1a7ecc4c99031f5e9ae99d9201
> commit: e2427b09ba929c2b9d02556b74a85161a7364792 phy: Add support for Qualcomm's USB HS phy
> date:   5 weeks ago
> config: i386-randconfig-x019-03061728 (attached as .config)
> compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
> reproduce:
>         git checkout e2427b09ba929c2b9d02556b74a85161a7364792
>         # save the attached .config to linux build tree
>         make ARCH=i386 
> 
> All errors (new ones prefixed by >>):
> 
>    drivers/built-in.o: In function `qcom_usb_hs_phy_power_off':
> >> phy-qcom-usb-hs.c:(.text+0x1248): undefined reference to `extcon_unregister_notifier'
>    drivers/built-in.o: In function `qcom_usb_hs_phy_power_on':
> >> phy-qcom-usb-hs.c:(.text+0x1389): undefined reference to `extcon_get_state'
> >> phy-qcom-usb-hs.c:(.text+0x13a4): undefined reference to `extcon_register_notifier'
>    drivers/built-in.o: In function `qcom_usb_hs_phy_probe':
> >> phy-qcom-usb-hs.c:(.text+0x1551): undefined reference to `extcon_get_edev_by_phandle'

Agreed. The same fix is required:

----8<-----
From: Stephen Boyd <stephen.boyd@...aro.org>
Subject: [PATCH] phy: qcom-usb-hs: Add depends on EXTCON

We get the following compile errors if EXTCON is enabled as a
module but this driver is builtin:

drivers/built-in.o: In function `qcom_usb_hs_phy_power_off':
phy-qcom-usb-hs.c:(.text+0x1089): undefined reference to `extcon_unregister_notifier'
drivers/built-in.o: In function `qcom_usb_hs_phy_probe':
phy-qcom-usb-hs.c:(.text+0x11b5): undefined reference to `extcon_get_edev_by_phandle'
drivers/built-in.o: In function `qcom_usb_hs_phy_power_on':
phy-qcom-usb-hs.c:(.text+0x128e): undefined reference to `extcon_get_state'
phy-qcom-usb-hs.c:(.text+0x12a9): undefined reference to `extcon_register_notifier'

so let's mark this as needing to follow the modular status of
the extcon framework.

Fixes: 9994a33865f4 e2427b09ba929c2b9 (phy: Add support for Qualcomm's USB HS phy")
Signed-off-by: Stephen Boyd <stephen.boyd@...aro.org>
---
 drivers/phy/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 61a22e985831..0386534892c5 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -440,6 +440,7 @@ config PHY_QCOM_UFS
 config PHY_QCOM_USB_HS
 	tristate "Qualcomm USB HS PHY module"
 	depends on USB_ULPI_BUS
+	depends on EXTCON || !EXTCON # if EXTCON=m, this cannot be built-in
 	select GENERIC_PHY
 	help
 	  Support for the USB high-speed ULPI compliant phy on Qualcomm
-- 
2.10.0.297.gf6727b0