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Date:   Tue, 5 Oct 2021 16:05:08 -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 12:04 PM, Randy Dunlap wrote:
> 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.

Yeah, I easily see that in linux-next instead of mainline.

Still digging into it.  :(

-- 
~Randy

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