Re: [PATCH v8 10/16] reset: Add a reset controller driver for the Lantiq XWAY based SoCs

[Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>]

Hi Hauke,

On Thu, 2017-08-03 at 00:57 +0200, Hauke Mehrtens wrote:
> From: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
> 
> The reset controllers (on xRX200 and newer SoCs have two of them) are
> provided by the RCU module. This was initially implemented as a simple
> reset controller. However, the RCU module provides more functionality
> (ethernet GPHYs, USB PHY, etc.), which makes it a MFD device.
> The old reset controller driver implementation from
> arch/mips/lantiq/xway/reset.c did not honor this fact.
> 
> For some devices the request and the status bits are different.
> 
> Signed-off-by: Hauke Mehrtens <hauke@xxxxxxxxxx>
> Cc: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
> ---
>  .../devicetree/bindings/reset/lantiq,reset.txt     |  30 +++
>  drivers/reset/Kconfig                              |   6 +
>  drivers/reset/Makefile                             |   1 +
>  drivers/reset/reset-lantiq.c                       | 224 +++++++++++++++++++++
>  4 files changed, 261 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/reset/lantiq,reset.txt
>  create mode 100644 drivers/reset/reset-lantiq.c
> 
[...]
> diff --git a/drivers/reset/reset-lantiq.c b/drivers/reset/reset-lantiq.c
> new file mode 100644
> index 000000000000..b84c45e7e6b8
> --- /dev/null
> +++ b/drivers/reset/reset-lantiq.c
> @@ -0,0 +1,224 @@
[...]
> +static int lantiq_rcu_reset_of_probe(struct platform_device *pdev,
> +			       struct lantiq_rcu_reset_priv *priv)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct resource *res;
> +	struct resource res_parent;
> +	int ret;
> +
> +	priv->regmap = syscon_node_to_regmap(dev->of_node->parent);
> +	if (IS_ERR(priv->regmap)) {
> +		dev_err(&pdev->dev, "Failed to lookup RCU regmap\n");
> +		return PTR_ERR(priv->regmap);
> +	}
> +
> +	ret = of_address_to_resource(dev->of_node->parent, 0, &res_parent);
> +	if (ret)
> +		return ret;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!res) {
> +		dev_err(&pdev->dev, "Failed to get RCU reset offset\n");
> +		return ret;

This should return -EINVAL instead of 0.

> +	}
> +
> +	if (res->start < res_parent.start)
> +		return -ENOENT;
> +	priv->reset_offset = res->start - res_parent.start;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> +	if (!res) {
> +		dev_err(&pdev->dev, "Failed to get RCU status offset\n");
> +		return ret;

Same here.

With this fixed,
Acked-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>

regards
Philipp

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