netdev - Re: [PATCH net-next 13/13] ravb: Add reset support

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Date:   Fri, 27 Aug 2021 23:17:07 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     Biju Das <biju.das.jz@...renesas.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
CC:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Andrew Lunn <andrew@...n.ch>,
        Sergei Shtylyov <sergei.shtylyov@...il.com>,
        "Geert Uytterhoeven" <geert+renesas@...der.be>,
        Adam Ford <aford173@...il.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        <netdev@...r.kernel.org>, <linux-renesas-soc@...r.kernel.org>,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>
Subject: Re: [PATCH net-next 13/13] ravb: Add reset support

On 8/25/21 10:01 AM, Biju Das wrote:

> Reset support is present on R-Car. Let's support it, if it is
> available.
> 
> Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
[...]
> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
> index 7a144b45e41d..0f85f2d97b18 100644
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
[...]

> @@ -2349,6 +2358,7 @@ static int ravb_probe(struct platform_device *pdev)
>  
>  	pm_runtime_put(&pdev->dev);
>  	pm_runtime_disable(&pdev->dev);
> +	reset_control_assert(rstc);
>  	return error;
>  }
>  
> @@ -2374,6 +2384,7 @@ static int ravb_remove(struct platform_device *pdev)
>  	netif_napi_del(&priv->napi[RAVB_BE]);
>  	ravb_mdio_release(priv);
>  	pm_runtime_disable(&pdev->dev);
> +	reset_control_assert(priv->rstc);
>  	free_netdev(ndev);
>  	platform_set_drvdata(pdev, NULL);
>  

   Is it possible to get into/out of reset in open()/close() methods?
   Otherwise, looks good (I'm not much into reset h/w)

Reviewed-by: Sergey Shtylyov <s.shtylyov@....ru>

MBR, Sergey