linux-kernel - Re: [PATCH v4 2/4] firmware: meson_sm: Add secure power domain support

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Message-ID: <7hk188stcy.fsf@baylibre.com>
Date:   Sat, 09 Nov 2019 21:11:09 +0100
From:   Kevin Hilman <khilman@...libre.com>
To:     Jianxin Pan <jianxin.pan@...ogic.com>,
        linux-amlogic@...ts.infradead.org
Cc:     Jianxin Pan <jianxin.pan@...ogic.com>,
        Rob Herring <robh+dt@...nel.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        Jian Hu <jian.hu@...ogic.com>,
        Hanjie Lin <hanjie.lin@...ogic.com>,
        Victor Wan <victor.wan@...ogic.com>,
        Xingyu Chen <xingyu.chen@...ogic.com>
Subject: Re: [PATCH v4 2/4] firmware: meson_sm: Add secure power domain support

Jianxin Pan <jianxin.pan@...ogic.com> writes:

> The Amlogic Meson A1/C1 Secure Monitor implements calls to control power
> domain.
>
> Signed-off-by: Jianxin Pan <jianxin.pan@...ogic.com>
> ---
>  drivers/firmware/meson/meson_sm.c       | 2 ++
>  include/linux/firmware/meson/meson_sm.h | 2 ++
>  2 files changed, 4 insertions(+)
>
> diff --git a/drivers/firmware/meson/meson_sm.c b/drivers/firmware/meson/meson_sm.c
> index 1d5b4d7..7ec09f5 100644
> --- a/drivers/firmware/meson/meson_sm.c
> +++ b/drivers/firmware/meson/meson_sm.c
> @@ -44,6 +44,8 @@ static const struct meson_sm_chip gxbb_chip = {
>  		CMD(SM_EFUSE_WRITE,	0x82000031),
>  		CMD(SM_EFUSE_USER_MAX,	0x82000033),
>  		CMD(SM_GET_CHIP_ID,	0x82000044),
> +		CMD(SM_PWRC_SET,	0x82000093),
> +		CMD(SM_PWRC_GET,	0x82000095),
>  		{ /* sentinel */ },
>  	},
>  };
> diff --git a/include/linux/firmware/meson/meson_sm.h b/include/linux/firmware/meson/meson_sm.h
> index 6669e2a..4ed3989 100644
> --- a/include/linux/firmware/meson/meson_sm.h
> +++ b/include/linux/firmware/meson/meson_sm.h
> @@ -12,6 +12,8 @@ enum {
>  	SM_EFUSE_WRITE,
>  	SM_EFUSE_USER_MAX,
>  	SM_GET_CHIP_ID,
> +	SM_PWRC_SET,
> +	SM_PWRC_GET,

These new IDs are unique to the A1/C1 family.  Maybe we should add a
prefix to better indicate that.  Maybe:

       SM_A1_PWRC_SET,
       SM_A1_PWRC_GET,

Thoughts?

Kevin