linux-kernel - Re: [PATCH] usb: typec: STUSB160X should select REGMAP

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Date:   Tue, 5 Oct 2021 12:04:51 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Amelie Delaunay <amelie.delaunay@...com>,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH] usb: typec: STUSB160X should select REGMAP_I2C

On 10/5/21 4:48 AM, Greg Kroah-Hartman wrote:
> On Mon, Oct 04, 2021 at 04:21:03PM -0700, Randy Dunlap wrote:
>> REGMAP_I2C is not a user visible kconfig symbol so driver configs
>> should not "depend on" it. They should depend on I2C and then
>> select REGMAP_I2C.
>>
>> If this worked, it was only because some other driver had set/enabled
>> REGMAP_I2C.
>>
>> Fixes: da0cb6310094 ("usb: typec: add support for STUSB160x Type-C controller family")
>> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
>> Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
>> Cc: Amelie Delaunay <amelie.delaunay@...com>
>> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>> Cc: linux-usb@...r.kernel.org
>> ---
>>   drivers/usb/typec/Kconfig |    4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> With this applied, I get the following build error:
> 
> drivers/of/Kconfig:69:error: recursive dependency detected!
> drivers/of/Kconfig:69:	symbol OF_IRQ depends on IRQ_DOMAIN
> kernel/irq/Kconfig:59:	symbol IRQ_DOMAIN is selected by REGMAP
> drivers/base/regmap/Kconfig:7:	symbol REGMAP default is visible depending on REGMAP_I2C
> drivers/base/regmap/Kconfig:20:symbol REGMAP_I2C is selected by TYPEC_STUSB160X
> drivers/usb/typec/Kconfig:66:	symbol TYPEC_STUSB160X depends on USB_ROLE_SWITCH
> drivers/usb/roles/Kconfig:3:	symbol USB_ROLE_SWITCH is selected by USB_MUSB_MEDIATEK
> drivers/usb/musb/Kconfig:119:	symbol USB_MUSB_MEDIATEK depends on GENERIC_PHY
> drivers/phy/Kconfig:8:	symbol GENERIC_PHY is selected by PHY_BCM_NS_USB3
> drivers/phy/broadcom/Kconfig:49:	symbol PHY_BCM_NS_USB3 depends on MDIO_BUS
> drivers/net/mdio/Kconfig:13:	symbol MDIO_BUS depends on MDIO_DEVICE
> drivers/net/mdio/Kconfig:6:	symbol MDIO_DEVICE is selected by PHYLIB
> drivers/net/phy/Kconfig:16:	symbol PHYLIB is selected by ARC_EMAC_CORE
> drivers/net/ethernet/arc/Kconfig:19:	symbol ARC_EMAC_CORE is selected by ARC_EMAC
> drivers/net/ethernet/arc/Kconfig:25:	symbol ARC_EMAC depends on OF_IRQ
> For a resolution refer to Documentation/kbuild/kconfig-language.rst
> subsection "Kconfig recursive dependency limitations"
> 
> So I can't take it as-is :(

Darn, I never saw that, but I'll look into it.

thanks.

-- 
~Randy