linux-kernel - Re: [PATCH 01/10] Revert "mfd: cros_ec: Add SCP Core-1 as a new CrOS EC MCU"

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Date:   Mon, 9 Jan 2023 11:38:27 -0800
From:   Benson Leung <bleung@...gle.com>
To:     Prashant Malani <pmalani@...omium.org>
Cc:     linux-kernel@...r.kernel.org, chrome-platform@...ts.linux.dev,
        heikki.krogerus@...ux.intel.com,
        Benson Leung <bleung@...omium.org>,
        Daisuke Nojiri <dnojiri@...omium.org>,
        "Dustin L. Howett" <dustin@...ett.net>,
        Evan Green <evgreen@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <groeck@...omium.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Lee Jones <lee.jones@...aro.org>, Lee Jones <lee@...nel.org>,
        Sebastian Reichel <sebastian.reichel@...labora.com>,
        Stephen Boyd <swboyd@...omium.org>,
        Tinghan Shen <tinghan.shen@...iatek.com>,
        Tzung-Bi Shih <tzungbi@...nel.org>,
        Xiang wangx <wangxiang@...rlc.com>
Subject: Re: [PATCH 01/10] Revert "mfd: cros_ec: Add SCP Core-1 as a new CrOS
 EC MCU"

On Wed, Dec 28, 2022 at 12:45:04AM +0000, Prashant Malani wrote:
> This reverts commit 66ee379d743c69c726b61d078119a34d5be96a35.
> 
> The feature flag introduced by Commit 66ee379d743c ("mfd: cros_ec: Add
> SCP Core-1 as a new CrOS EC MCU") was not first added in the source EC
> code base[1]. This can lead to the possible misinterpration of an EC's
> supported feature set, as well as causes issues with all future feature
> flag updates.
> 
> [1] https://source.chromium.org/chromium/chromiumos/platform/ec/+/main:include/ec_commands.h
> 
> Signed-off-by: Prashant Malani <pmalani@...omium.org>

Reviewed-by: Benson Leung <bleung@...omium.org>

> ---
> 
> While this patch modifies drivers/mfd, it would be preferable to submit
> it through the chrome-platform tree, since that eliminates cross-tree
> dependencies for the series of which this patch is a part.
> 
> 
>  drivers/mfd/cros_ec_dev.c                      | 5 -----
>  include/linux/platform_data/cros_ec_commands.h | 2 --
>  include/linux/platform_data/cros_ec_proto.h    | 1 -
>  3 files changed, 8 deletions(-)
> 
> diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
> index 344ad03bdc42..02d4271dfe06 100644
> --- a/drivers/mfd/cros_ec_dev.c
> +++ b/drivers/mfd/cros_ec_dev.c
> @@ -64,11 +64,6 @@ static const struct cros_feature_to_name cros_mcu_devices[] = {
>  		.name	= CROS_EC_DEV_SCP_NAME,
>  		.desc	= "System Control Processor",
>  	},
> -	{
> -		.id	= EC_FEATURE_SCP_C1,
> -		.name	= CROS_EC_DEV_SCP_C1_NAME,
> -		.desc	= "System Control Processor 2nd Core",
> -	},
>  	{
>  		.id	= EC_FEATURE_TOUCHPAD,
>  		.name	= CROS_EC_DEV_TP_NAME,
> diff --git a/include/linux/platform_data/cros_ec_commands.h b/include/linux/platform_data/cros_ec_commands.h
> index 5744a2d746aa..7c94bf5c8f05 100644
> --- a/include/linux/platform_data/cros_ec_commands.h
> +++ b/include/linux/platform_data/cros_ec_commands.h
> @@ -1300,8 +1300,6 @@ enum ec_feature_code {
>  	 * mux.
>  	 */
>  	EC_FEATURE_TYPEC_MUX_REQUIRE_AP_ACK = 43,
> -	/* The MCU is a System Companion Processor (SCP) 2nd Core. */
> -	EC_FEATURE_SCP_C1 = 45,
>  };
>  
>  #define EC_FEATURE_MASK_0(event_code) BIT(event_code % 32)
> diff --git a/include/linux/platform_data/cros_ec_proto.h b/include/linux/platform_data/cros_ec_proto.h
> index e43107e0bee1..a1f5b6d6db3a 100644
> --- a/include/linux/platform_data/cros_ec_proto.h
> +++ b/include/linux/platform_data/cros_ec_proto.h
> @@ -19,7 +19,6 @@
>  #define CROS_EC_DEV_ISH_NAME	"cros_ish"
>  #define CROS_EC_DEV_PD_NAME	"cros_pd"
>  #define CROS_EC_DEV_SCP_NAME	"cros_scp"
> -#define CROS_EC_DEV_SCP_C1_NAME	"cros_scp_c1"
>  #define CROS_EC_DEV_TP_NAME	"cros_tp"
>  
>  #define CROS_EC_DEV_EC_INDEX 0
> -- 
> 2.39.0.314.g84b9a713c41-goog
> 
> 

-- 
Benson Leung
Staff Software Engineer
Chrome OS Kernel
Google Inc.
bleung@...gle.com
Chromium OS Project
bleung@...omium.org

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