# Re: \[PATCH RFC net-next 03/19\] net: mvpp2: add CM3 SRAM memory map

- From: Andrew Lunn \<andrew@lunn.ch\>
- Date: 2021-01-10 17:05:43 
- List: netdev
- Page: https://ratatoskr.run/netdev/2021/01/6228921
- Thread: https://ratatoskr.run/netdev/2021/01/6228879/t.md

```text
> +static int mvpp2_get_sram(struct platform_device *pdev,
> +			  struct mvpp2 *priv)
> +{
> +	struct device_node *dn = pdev->dev.of_node;
> +	struct resource *res;
> +
> +	if (has_acpi_companion(&pdev->dev)) {
> +		res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
> +		if (!res) {
> +			dev_warn(&pdev->dev, "ACPI is too old, TX FC disabled\n");
> +			return 0;
> +		}
> +		priv->cm3_base = devm_ioremap_resource(&pdev->dev, res);
> +		if (IS_ERR(priv->cm3_base))
> +			return PTR_ERR(priv->cm3_base);
> +	} else {
> +		priv->sram_pool = of_gen_pool_get(dn, "cm3-mem", 0);
> +		if (!priv->sram_pool) {
> +			dev_warn(&pdev->dev, "DT is too old, TX FC disabled\n");
> +			return 0;
> +		}
> +		priv->cm3_base = (void __iomem *)gen_pool_alloc(priv->sram_pool,
> +								MSS_SRAM_SIZE);
> +		if (!priv->cm3_base)
> +			return -ENOMEM;

Should there be -EPROBE_DEFER handling in here somewhere? The SRAM is
a device, so it might not of been probed yet?

  Andrew
```