linux-kernel - Re: [PATCH 03/10] remoteproc: imx: use devm

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Date:   Mon, 27 Jul 2020 08:23:35 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Peng Fan <peng.fan@....com>
Cc:     bjorn.andersson@...aro.org, mathieu.poirier@...aro.org,
        robh+dt@...nel.org, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-imx@....com, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 03/10] remoteproc: imx: use devm_ioremap

On Fri, Jul 24, 2020 at 04:08:06PM +0800, Peng Fan wrote:
> We might need to map an region multiple times, becaue the region might
> be shared between remote processors, such i.MX8QM with dual M4 cores.
> So use devm_ioremap, not devm_ioremap_resource.

Can you please give an example of this kind of shared resources and
how they should be handled by two separate devices?

> Reviewed-by: Richard Zhu <hongxing.zhu@....com>
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  drivers/remoteproc/imx_rproc.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
> index 3b3904ebac75..82594a800a1b 100644
> --- a/drivers/remoteproc/imx_rproc.c
> +++ b/drivers/remoteproc/imx_rproc.c
> @@ -296,9 +296,10 @@ static int imx_rproc_addr_init(struct imx_rproc *priv,
>  		if (b >= IMX7D_RPROC_MEM_MAX)
>  			break;
>  
> -		priv->mem[b].cpu_addr = devm_ioremap_resource(&pdev->dev, &res);
> +		/* Not use resource version, because we might share region*/
> +		priv->mem[b].cpu_addr = devm_ioremap(&pdev->dev, res.start, resource_size(&res));
>  		if (IS_ERR(priv->mem[b].cpu_addr)) {
> -			dev_err(dev, "devm_ioremap_resource failed\n");
> +			dev_err(dev, "devm_ioremap %pR failed\n", &res);
>  			err = PTR_ERR(priv->mem[b].cpu_addr);
>  			return err;
>  		}
> -- 
> 2.16.4
> 
> 

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