linux-kernel - Re: [PATCH 2/7] reset: sunxi: allow MFD subdevices probe

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Date:	Mon, 28 Apr 2014 16:27:54 -0700
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Boris BREZILLON <boris.brezillon@...e-electrons.com>
Cc:	Emilio López <emilio@...pez.com.ar>,
	Mike Turquette <mturquette@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>, Chen-Yu Tsai <wens@...e.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Shuge <shuge@...winnertech.com>, kevin@...winnertech.com,
	Hans de Goede <hdegoede@...hat.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	dev@...ux-sunxi.org
Subject: Re: [PATCH 2/7] reset: sunxi: allow MFD subdevices probe

On Mon, Apr 28, 2014 at 04:58:45PM +0200, Boris BREZILLON wrote:
> The current implementation uses sunxi_reset_init function for both early
> init and platform device probe.
> 
> The sunxi_reset_init function uses DT to retrieve device resources, which
> will be an issue if reset controllers are registered from an MFD device
> that define resources from mfd_cell definition.
> 
> Moreover, we can make use of devm functions when we're in probe context.
> 
> Signed-off-by: Boris BREZILLON <boris.brezillon@...e-electrons.com>
> ---
>  drivers/reset/reset-sunxi.c | 19 ++++++++++++++++++-
>  1 file changed, 18 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/reset/reset-sunxi.c b/drivers/reset/reset-sunxi.c
> index 695bd34..115fbb1 100644
> --- a/drivers/reset/reset-sunxi.c
> +++ b/drivers/reset/reset-sunxi.c
> @@ -145,7 +145,24 @@ MODULE_DEVICE_TABLE(of, sunxi_reset_dt_ids);
>  
>  static int sunxi_reset_probe(struct platform_device *pdev)
>  {
> -	return sunxi_reset_init(pdev->dev.of_node);
> +	struct sunxi_reset_data *data;
> +	struct resource *res;
> +
> +	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
> +	if (!data)
> +		return -ENOMEM;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	data->membase = devm_request_and_ioremap(&pdev->dev, res);
> +	if (!data->membase)
> +		return -ENOMEM;
> +
> +	data->rcdev.owner = THIS_MODULE;
> +	data->rcdev.nr_resets = resource_size(res) * 32;
> +	data->rcdev.ops = &sunxi_reset_ops;
> +	data->rcdev.of_node = pdev->dev.of_node;
> +
> +	return reset_controller_register(&data->rcdev);
>  }
>  
>  static int sunxi_reset_remove(struct platform_device *pdev)

If you're switching to devm_ functions, you'll also have to remove the
iounmap and kfree in the _remove.

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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