linux-kernel - Re: [PATCH v2] usb: misc: onboard_usb_dev: introduce new config symbol for usb5744 SMBus support

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Message-ID: <2024100442-yoyo-fifth-2125@gregkh>
Date: Fri, 4 Oct 2024 15:36:11 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Radhey Shyam Pandey <radhey.shyam.pandey@....com>
Cc: mka@...omium.org, paul.walmsley@...ive.com, palmer@...belt.com,
	aou@...s.berkeley.edu, wentong.wu@...el.com,
	sakari.ailus@...ux.intel.com, javier.carrasco@...fvision.net,
	matthias@...hlcke.net, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
	git@....com
Subject: Re: [PATCH v2] usb: misc: onboard_usb_dev: introduce new config
 symbol for usb5744 SMBus support

On Sat, Sep 28, 2024 at 06:56:32PM +0530, Radhey Shyam Pandey wrote:
> Introduce new kernel config symbol for Microchip usb5744 SMBus programming
> support. Since usb5744 i2c initialization routine uses i2c SMBus APIs these
> APIs should only be invoked when kernel has I2C support. This new kernel
> config describes the dependency on I2C kernel support and fix the below
> build issues when USB_ONBOARD_DEV=y and CONFIG_I2C=m.
> 
> riscv64-linux-ld: drivers/usb/misc/onboard_usb_dev.o:
> undefined reference to `i2c_find_device_by_fwnode'
> drivers/usb/misc/onboard_usb_dev.c:408:(.text+0xb24): undefined
> reference to `i2c_smbus_write_block_data'
> <snip>
> 
> Parsing of the i2c-bus bus handle is not put under usb5744 kernel config
> check as the intention is to report an error when DT is configured for
> usb5744 SMBus support and kernel has USB_ONBOARD_DEV_USB5744 disabled.
> 
> Fixes: 6782311d04df ("usb: misc: onboard_usb_dev: add Microchip usb5744 SMBus programming support")
> Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@....com>
> Suggested-by: Matthias Kaehlcke <matthias@...hlcke.net>
> Reported-by: kernel test robot <lkp@...el.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202409140539.3Axwv38m-lkp@intel.com/
> Acked-by: Matthias Kaehlcke <matthias@...hlcke.net>
> ---
> Changes for v2:
> - As suggested by Greg drop default 'y' and instead describe the
>   constraints in the kconfig description.
> ---
>  drivers/usb/misc/Kconfig           | 12 ++++++++++++
>  drivers/usb/misc/onboard_usb_dev.c |  6 ++++--
>  2 files changed, 16 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/misc/Kconfig b/drivers/usb/misc/Kconfig
> index 50b86d531701..6497c4e81e95 100644
> --- a/drivers/usb/misc/Kconfig
> +++ b/drivers/usb/misc/Kconfig
> @@ -331,3 +331,15 @@ config USB_ONBOARD_DEV
>  	  this config will enable the driver and it will automatically
>  	  match the state of the USB subsystem. If this driver is a
>  	  module it will be called onboard_usb_dev.
> +
> +config USB_ONBOARD_DEV_USB5744
> +	bool "Onboard USB Microchip usb5744 hub with SMBus support"
> +	depends on (USB_ONBOARD_DEV && I2C=y) || (USB_ONBOARD_DEV=m && I2C=m)
> +	help
> +	  Say Y here if you want to support onboard USB Microchip usb5744
> +	  hub that requires SMBus initialization.
> +
> +	  This options enables usb5744 i2c default initialization sequence
> +	  during hub start-up configuration stage. It is must to enable this
> +	  option on AMD Kria KR260 Robotics Starter Kit as this hub is
> +	  connected to USB-SD converter which mounts the root filesystem.

With this applied I get the following build warning:


WARNING: unmet direct dependencies detected for MODVERSIONS
  Depends on [n]: MODULES [=y] && !COMPILE_TEST [=y]
  Selected by [y]:
  - RANDSTRUCT_FULL [=y] && (CC_HAS_RANDSTRUCT [=n] || GCC_PLUGINS [=y]) && MODULES [=y]

WARNING: unmet direct dependencies detected for MODVERSIONS
  Depends on [n]: MODULES [=y] && !COMPILE_TEST [=y]
  Selected by [y]:
  - RANDSTRUCT_FULL [=y] && (CC_HAS_RANDSTRUCT [=n] || GCC_PLUGINS [=y]) && MODULES [=y]

WARNING: unmet direct dependencies detected for MODVERSIONS
  Depends on [n]: MODULES [=y] && !COMPILE_TEST [=y]
  Selected by [y]:
  - RANDSTRUCT_FULL [=y] && (CC_HAS_RANDSTRUCT [=n] || GCC_PLUGINS [=y]) && MODULES [=y]


Which is odd.

It's one extra "unmet direct ..." message than normal for now, so
something in this commit is not working properly.

Can you fix this up and send a new version?

thanks,

greg k-h