Re: [RFC/PATCH] net: ethernet: nixge: Use of_get_mac_address()

Moritz Fischer
2018-04-26T22:04:01Z

On Thu, Apr 26, 2018 at 02:57:42PM -0700, Moritz Fischer wrote:
> Make nixge driver work with 'mac-address' property instead of
> 'address' property. There are currently no in-tree users and
> the only users of this driver are devices that use overlays
> we control to instantiate the device together with the corresponding
> FPGA images.
>
> Signed-off-by: Moritz Fischer <mdf@kernel.org>
> ---
>
> Hi David, Rob,
>
> with Mike's change that enable the generic 'mac-address'
> binding that I barely missed with the submission of this
> driver I was wondering if we can still change the binding.
>
> I'm aware that this generally is a nonono case, since the binding
> is considered API, but since there are no users outside of our
> devicetree overlays that we ship with our devices I thought I'd ask.
>
> If you don't think that's a good idea do you think supporting both
> would be worthwhile?
>
> Thanks,
>
> Moritz
>
> ---
> .../devicetree/bindings/net/nixge.txt | 4 ++--
> drivers/net/ethernet/ni/nixge.c | 20 ++-----------------
> 2 files changed, 4 insertions(+), 20 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/net/nixge.txt b/Documentation/devicetree/bindings/net/nixge.txt
> index e55af7f0881a..9bc1ecfb6762 100644
> --- a/Documentation/devicetree/bindings/net/nixge.txt
> +++ b/Documentation/devicetree/bindings/net/nixge.txt
> @@ -8,7 +8,7 @@ Required properties:
> - phy-mode: See ethernet.txt file in the same directory.
> - phy-handle: See ethernet.txt file in the same directory.
> - nvmem-cells: Phandle of nvmem cell containing the MAC address
> -- nvmem-cell-names: Should be "address"
> +- nvmem-cell-names: Should be "mac-address"
>
> Examples (10G generic PHY):
> nixge0: ethernet@40000000 {
> @@ -16,7 +16,7 @@ Examples (10G generic PHY):
> reg = <0x40000000 0x6000>;
>
> nvmem-cells = <&eth1_addr>;
> - nvmem-cell-names = "address";
> + nvmem-cell-names = "mac-address";
>
> interrupts = <0 29 IRQ_TYPE_LEVEL_HIGH>, <0 30 IRQ_TYPE_LEVEL_HIGH>;
> interrupt-names = "rx", "tx";
> diff --git a/drivers/net/ethernet/ni/nixge.c b/drivers/net/ethernet/ni/nixge.c
> index 27364b7572fc..7918c7b7273b 100644
> --- a/drivers/net/ethernet/ni/nixge.c
> +++ b/drivers/net/ethernet/ni/nixge.c
> @@ -1162,22 +1162,6 @@ static int nixge_mdio_setup(struct nixge_priv *priv, struct device_node *np)
> return of_mdiobus_register(bus, np);
> }
>
> -static void *nixge_get_nvmem_address(struct device *dev)
> -{
> - struct nvmem_cell *cell;
> - size_t cell_size;
> - char *mac;
> -
> - cell = nvmem_cell_get(dev, "address");
> - if (IS_ERR(cell))
> - return cell;
> -
> - mac = nvmem_cell_read(cell, &cell_size);
> - nvmem_cell_put(cell);
> -
> - return mac;
> -}
> -
> static int nixge_probe(struct platform_device *pdev)
> {
> struct nixge_priv *priv;
> @@ -1201,8 +1185,8 @@ static int nixge_probe(struct platform_device *pdev)
> ndev->min_mtu = 64;
> ndev->max_mtu = NIXGE_JUMBO_MTU;
>
> - mac_addr = nixge_get_nvmem_address(&pdev->dev);
> - if (mac_addr && is_valid_ether_addr(mac_addr))
> + mac_addr = of_get_mac_address(np);
Sorry, that should be &pdev->dev.of_node here ... I'll resubmit if
general idea ok.

> + if (mac_addr)
> ether_addr_copy(ndev->dev_addr, mac_addr);
> else
> eth_hw_addr_random(ndev);
> --
> 2.17.0
>

- Moritz