Re: [PATCH 3/4] net: dsa: vsc73xx: add support for parallel mode

Florian Fainelli
2019-07-01T16:45:21Z

On 7/1/19 8:27 AM, Pawel Dembicki wrote:
> This patch add platform part of vsc73xx driver.
> It allows to use chip connected by PI interface.
>
> Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>
> ---

[snip]

> + struct vsc73xx_platform *vsc_platform = vsc->priv;
> + u32 offset;
> +
> + if (!vsc73xx_is_addr_valid(block, subblock))
> + return -EINVAL;
> +
> + offset = vsc73xx_make_addr(block, subblock, reg);
> +
> + mutex_lock(&vsc->lock);
> + iowrite32be(val, vsc_platform->base_addr + offset);
> + mutex_unlock(&vsc->lock);

Similar question from Andrew, why is the locking done in the platform
layer, should not that be done in the core I/O operation instead?

> +
> + return 0;
> +}
> +
> +static int vsc73xx_platform_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct vsc73xx_platform *vsc_platform;
> + struct resource *res = NULL;
> + int ret;
> +
> + vsc_platform = devm_kzalloc(dev, sizeof(*vsc_platform), GFP_KERNEL);
> + if (!vsc_platform)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, vsc_platform);
> + vsc_platform->pdev = pdev;
> + vsc_platform->vsc.dev = dev;
> + vsc_platform->vsc.priv = vsc_platform;
> + vsc_platform->vsc.ops = &vsc73xx_platform_ops;
> +
> + /* obtain I/O memory space */
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res) {
> + dev_err(&pdev->dev, "cannot obtain I/O memory space\n");
> + ret = -ENXIO;
> + return ret;
> + }
> +
> + vsc_platform->base_addr = devm_ioremap_resource(&pdev->dev, res);

devm_ioremap_resource takes care of checking that the resource pointer
is valid, no need to do that here.

> + if (!vsc_platform->base_addr) {

if (IS_ERR(vsc_platform->base_addr))
--
Florian