linux-kernel - Re: [can-next PATCH 1/1] net: can: c_can_platform: Use devm_ioremap instead of devm_ioremap

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Message-ID: <4a97162dedd6ab064e83c52757f2ce42@mail.zeus03.de>
Date:	Fri, 25 Jul 2014 12:49:25 +0200
From:	Wolfram Sang <wsa@...g-engineering.com>
To:	Mugunthan V N <mugunthanvnm@...com>
Cc:	Wolfgang Grandegger <wg@...ndegger.com>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Pavel Machek <pavel@...x.de>, Thor Thayer <tthayer@...era.com>,
	Prabhakar Lad <prabhakar.csengg@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Chen Gang <gang.chen@...anux.com>,
	George Cherian <george.cherian@...com>,
	linux-can@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [can-next PATCH 1/1] net: can: c_can_platform: Use devm_ioremap instead of devm_ioremap_resource.

Am 25-07-2014 08:19, schrieb Mugunthan V N:
> From: George Cherian <george.cherian@...com>
> 
> The raminit register is shared register for both can0 and can1.
> Using devm_ioremap_resource fails the mapping for can1 interface
> leading to a non functional can interface.
> 
> Signed-off-by: George Cherian <george.cherian@...com>
> Signed-off-by: Mugunthan V N <mugunthanvnm@...com>

The patch is a hack, or? It simply works because we drop all sanity 
checking on the resource.

I am on holiday and can't really check, yet I believe the AM335x has 
devicetree support for accessing single bits in SYSCONF. This is what 
needs to be applied here, too, AFAICT.

> ---
>  drivers/net/can/c_can/c_can_platform.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/can/c_can/c_can_platform.c
> b/drivers/net/can/c_can/c_can_platform.c
> index e29b6d0..5dede6e 100644
> --- a/drivers/net/can/c_can/c_can_platform.c
> +++ b/drivers/net/can/c_can/c_can_platform.c
> @@ -278,7 +278,8 @@ static int c_can_plat_probe(struct platform_device 
> *pdev)
>  			break;
>  		}
> 
> -		priv->raminit_ctrlreg = devm_ioremap_resource(&pdev->dev, res);
> +		priv->raminit_ctrlreg = devm_ioremap(&pdev->dev, res->start,
> +						     resource_size(res));
>  		if (IS_ERR(priv->raminit_ctrlreg) || priv->instance < 0)
>  			dev_info(&pdev->dev, "control memory is not used for raminit\n");
>  		else
--
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