linux-kernel - Re: [PATCH v2 net-next] net: dsa: b53: mmap: Add device tree support

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Date:   Mon, 15 Mar 2021 12:23:42 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Álvaro Fernández Rojas <noltari@...il.com>
Cc:     jonas.gorski@...il.com, Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 net-next] net: dsa: b53: mmap: Add device tree
 support

On Mon, 15 Mar 2021 16:11:40 +0100 Álvaro Fernández Rojas wrote:
> Add device tree support to b53_mmap.c while keeping platform devices support.
> 
> Signed-off-by: Álvaro Fernández Rojas <noltari@...il.com>
> ---
>  v2: add change suggested by Florian Fainelli (less "OF-centric") and replace
>   brcm,ports property with a ports child scan.
> 
>  drivers/net/dsa/b53/b53_mmap.c | 54 ++++++++++++++++++++++++++++++++++
>  1 file changed, 54 insertions(+)
> 
> diff --git a/drivers/net/dsa/b53/b53_mmap.c b/drivers/net/dsa/b53/b53_mmap.c
> index c628d0980c0b..94a4e3929ebf 100644
> --- a/drivers/net/dsa/b53/b53_mmap.c
> +++ b/drivers/net/dsa/b53/b53_mmap.c
> @@ -16,6 +16,7 @@
>   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
>   */
>  
> +#include <linux/bits.h>
>  #include <linux/kernel.h>
>  #include <linux/module.h>
>  #include <linux/io.h>
> @@ -228,11 +229,64 @@ static const struct b53_io_ops b53_mmap_ops = {
>  	.write64 = b53_mmap_write64,
>  };
>  
> +static int b53_mmap_probe_of(struct platform_device *pdev,
> +			     struct b53_platform_data **ppdata)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct device_node *np = dev->of_node;
> +	struct device_node *of_ports, *of_port;
> +	struct b53_platform_data *pdata;
> +	void __iomem *mem;

reverse xmas tree? Initialize out of line if needed.

> +	mem = devm_platform_ioremap_resource(pdev, 0);
> +	if (IS_ERR(mem))
> +		return PTR_ERR(mem);
> +
> +	pdata = devm_kzalloc(dev, sizeof(struct b53_platform_data),
> +			     GFP_KERNEL);
> +	if (!pdata)
> +		return -ENOMEM;
> +
> +	pdata->regs = mem;
> +	pdata->chip_id = BCM63XX_DEVICE_ID;
> +	pdata->big_endian = of_property_read_bool(np, "big-endian");
> +
> +	of_ports = of_get_child_by_name(np, "ports");

Isn't this leaking a ref on of_ports? I don't see any put.

> +	if (!of_ports) {
> +		dev_err(dev, "no ports child node found\n");
> +		return -EINVAL;
> +	}
> +
> +	for_each_available_child_of_node(of_ports, of_port) {
> +		u32 reg;
> +
> +		if (of_property_read_u32(of_port, "reg", &reg))
> +			continue;
> +
> +		if (reg < B53_CPU_PORT)
> +			pdata->enabled_ports |= BIT(reg);
> +	}
> +
> +	*ppdata = pdata;
> +
> +	return 0;
> +}
> +
>  static int b53_mmap_probe(struct platform_device *pdev)
>  {
> +	struct device_node *np = pdev->dev.of_node;
>  	struct b53_platform_data *pdata = pdev->dev.platform_data;
>  	struct b53_mmap_priv *priv;
>  	struct b53_device *dev;
> +	int ret;
> +
> +	if (!pdata && np) {
> +		ret = b53_mmap_probe_of(pdev, &pdata);
> +		if (ret) {
> +			dev_err(&pdev->dev, "OF probe error\n");
> +			return ret;
> +		}
> +	}
>  
>  	if (!pdata)
>  		return -EINVAL;