linux-kernel - Re: [PATCH 3/5] firmware: xilinx: Add system shutdown API interface

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Date:   Wed, 18 Dec 2019 15:24:26 +0100
From:   Michal Simek <michal.simek@...inx.com>
To:     Jolly Shah <jolly.shah@...inx.com>, ard.biesheuvel@...aro.org,
        mingo@...nel.org, gregkh@...uxfoundation.org,
        matt@...eblueprint.co.uk, sudeep.holla@....com,
        hkallweit1@...il.com, keescook@...omium.org,
        dmitry.torokhov@...il.com, michal.simek@...inx.com
Cc:     rajanv@...inx.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Rajan Vaja <rajan.vaja@...inx.com>
Subject: Re: [PATCH 3/5] firmware: xilinx: Add system shutdown API interface

On 05. 12. 19 0:29, Jolly Shah wrote:
> From: Rajan Vaja <rajan.vaja@...inx.com>
> 
> Add system shutdown API interface which asks firmware to
> perform system shutdown/restart.
> 
> Signed-off-by: Michal Simek <michal.simek@...inx.com>
> Signed-off-by: Rajan Vaja <rajan.vaja@...inx.com>
> Signed-off-by: Jolly Shah <jolly.shah@...inx.com>
> ---
>  drivers/firmware/xilinx/zynqmp.c     | 14 ++++++++++++++
>  include/linux/firmware/xlnx-zynqmp.h |  4 +++-
>  2 files changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
> index 9836174..8dcf5a4 100644
> --- a/drivers/firmware/xilinx/zynqmp.c
> +++ b/drivers/firmware/xilinx/zynqmp.c
> @@ -690,6 +690,19 @@ static int zynqmp_pm_config_reg_access(u32 register_access_id, u32 address,
>  				   address, mask, value, out);
>  }
>  
> +/**
> + * zynqmp_pm_system_shutdown - PM call to request a system shutdown or restart
> + * @type:	Shutdown or restart? 0 for shutdown, 1 for restart
> + * @subtype:	Specifies which system should be restarted or shut down
> + *
> + * Return:	Returns status, either success or error+reason
> + */
> +static int zynqmp_pm_system_shutdown(const u32 type, const u32 subtype)
> +{
> +	return zynqmp_pm_invoke_fn(PM_SYSTEM_SHUTDOWN, type, subtype,
> +				   0, 0, NULL);
> +}
> +
>  static const struct zynqmp_eemi_ops eemi_ops = {
>  	.get_api_version = zynqmp_pm_get_api_version,
>  	.get_chipid = zynqmp_pm_get_chipid,
> @@ -714,6 +727,7 @@ static const struct zynqmp_eemi_ops eemi_ops = {
>  	.fpga_load = zynqmp_pm_fpga_load,
>  	.fpga_get_status = zynqmp_pm_fpga_get_status,
>  	.register_access = zynqmp_pm_config_reg_access,
> +	.system_shutdown = zynqmp_pm_system_shutdown,
>  };
>  
>  /**
> diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
> index bf6e9db..b96ea5d 100644
> --- a/include/linux/firmware/xlnx-zynqmp.h
> +++ b/include/linux/firmware/xlnx-zynqmp.h
> @@ -61,7 +61,8 @@
>  
>  enum pm_api_id {
>  	PM_GET_API_VERSION = 1,
> -	PM_REQUEST_NODE = 13,
> +	PM_SYSTEM_SHUTDOWN = 12,
> +	PM_REQUEST_NODE,
>  	PM_RELEASE_NODE,
>  	PM_SET_REQUIREMENT,
>  	PM_RESET_ASSERT = 17,
> @@ -322,6 +323,7 @@ struct zynqmp_eemi_ops {
>  			       const enum zynqmp_pm_request_ack ack);
>  	int (*register_access)(u32 register_access_id, u32 address,
>  			       u32 mask, u32 value, u32 *out);
> +	int (*system_shutdown)(const u32 type, const u32 subtype);
>  };
>  
>  int zynqmp_pm_invoke_fn(u32 pm_api_id, u32 arg0, u32 arg1,
> 

This looks good to me.
Acked-by: Michal Simek <michal.simek@...inx.com>

Thanks,
Michal