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SubjectRe: [PATCH] of_net: Implement of_get_nvmem_mac_address helper
On Fri, Mar 23, 2018 at 03:24:34PM +0100, Mike Looijmans wrote:
> It's common practice to store MAC addresses for network interfaces into
> nvmem devices. However the code to actually do this in the kernel lacks,
> so this patch adds of_get_nvmem_mac_address() for drivers to obtain the
> address from an nvmem cell provider.
>
> This is particulary useful on devices where the ethernet interface cannot
> be configured by the bootloader, for example because it's in an FPGA.
>
> Tested by adapting the cadence macb driver to call this instead of
> of_get_mac_address().

Hi Mike

Please can you document the device tree binding. I assume you are
adding a nvmen-cells and nvmem-cell-names to the Ethernet node in
device tree.

> +/**
> + * Search the device tree for a MAC address, by calling of_get_mac_address
> + * and if that doesn't provide an address, fetch it from an nvmem provider
> + * using the name 'mac-address'.
> + * On success, copies the new address is into memory pointed to by addr and
> + * returns 0. Returns a negative error code otherwise.
> + * @dev: Pointer to the device containing the device_node
> + * @addr: Pointer to receive the MAC address using ether_addr_copy()
> + */
> +int of_get_nvmem_mac_address(struct device *dev, char *addr)
> +{
> + const char *mac;
> + struct nvmem_cell *cell;
> + size_t len;
> + int ret;
> +
> + mac = of_get_mac_address(dev->of_node);
> + if (mac) {
> + ether_addr_copy(addr, mac);
> + return 0;
> + }

Is there a need to add a new API? Could of_get_mac_address() be
extended to look in NVMEM? The MAC driver does not care. It is saying,
using OF get me a MAC address. One API seems sufficient, and would
mean you don't need to change the MAC drivers.

Andrew

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