Re: [PATCH v2 RFC net-next 03/18] net: mvpp2: add CM3 SRAM memory map

[Russell King - ARM Linux admin]

On Sun, Jan 24, 2021 at 01:43:52PM +0200, stefanc@xxxxxxxxxxx wrote:
> +		priv->sram_pool = of_gen_pool_get(dn, "cm3-mem", 0);
> +		if (!priv->sram_pool) {
> +			if (!defer_once) {
> +				defer_once = true;
> +				/* Try defer once */
> +				return -EPROBE_DEFER;
> +			}
> +			dev_warn(&pdev->dev, "DT is too old, Flow control not supported\n");
> +			return -ENOMEM;
> +		}
> +		priv->cm3_base = (void __iomem *)gen_pool_alloc(priv->sram_pool,
> +								MSS_SRAM_SIZE);
> +		if (!priv->cm3_base)
> +			return -ENOMEM;

This probably could do with a comment indicating that it is reliant on
this allocation happening at offset zero into the SRAM. The only reason
that is guaranteed _at the moment_ is because the SRAM mapping is 0x800
bytes in size, and you are requesting 0x800 bytes in this allocation,
so allocating the full size.

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