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Date:   Tue, 5 Mar 2019 12:16:06 +0100
From:   Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:     Arnd Bergmann <arnd@...db.de>, Benson Leung <bleung@...omium.org>
Cc:     Duncan Laurie <dlaurie@...gle.com>,
        Nick Crews <ncrews@...omium.org>,
        Wei Yongjun <weiyongjun1@...wei.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform/chrome: fix wilco-ec dependencies

Hi,

On 4/3/19 21:06, Arnd Bergmann wrote:
> When CROS_EC_LPC is set to =m, we get a link failure for a
> builtin wilco-ec module:
> 
> drivers/platform/chrome/wilco_ec/core.o: In function `wilco_ec_remove':
> core.c:(.text+0x26): undefined reference to `cros_ec_lpc_mec_destroy'
> drivers/platform/chrome/wilco_ec/core.o: In function `wilco_ec_probe':
> core.c:(.text+0x18c): undefined reference to `cros_ec_lpc_mec_init'
> core.c:(.text+0x224): undefined reference to `cros_ec_lpc_mec_destroy'
> drivers/platform/chrome/wilco_ec/mailbox.o: In function `wilco_ec_mailbox':
> mailbox.c:(.text+0x104): undefined reference to `cros_ec_lpc_io_bytes_mec'
> 
> The problem with the existing CROS_EC_LPC_MEC dependency is that this
> is only for a 'bool' symbol, so the information about the exported
> functions being in a module is lost on the way, and we actually have
> to depend on both CROS_EC_LPC and CROS_EC_LPC_MEC.
> 
> Fixes: 7b3d4f44abf0 ("platform/chrome: Add new driver for Wilco EC")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/platform/chrome/wilco_ec/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/platform/chrome/wilco_ec/Kconfig b/drivers/platform/chrome/wilco_ec/Kconfig
> index 4a119ced4d0c..e09e4cebe9b4 100644
> --- a/drivers/platform/chrome/wilco_ec/Kconfig
> +++ b/drivers/platform/chrome/wilco_ec/Kconfig
> @@ -1,6 +1,6 @@
>  config WILCO_EC
>  	tristate "ChromeOS Wilco Embedded Controller"
> -	depends on ACPI && X86 && CROS_EC_LPC_MEC
> +	depends on ACPI && X86 && CROS_EC_LPC && CROS_EC_LPC_MEC
>  	help
>  	  If you say Y here, you get support for talking to the ChromeOS
>  	  Wilco EC over an eSPI bus. This uses a simple byte-level protocol
> 

Applied as a fix to our chrome-platform-5.1 branch.

Thanks,
 Enric

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