netdev - Re: [RFC/PATCH] net: ethernet: nixge: Use of_get_mac

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Date:   Thu, 26 Apr 2018 15:04:01 -0700
From:   Moritz Fischer <mdf@...nel.org>
To:     Moritz Fischer <mdf@...nel.org>
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        netdev@...r.kernel.org, davem@...emloft.net, robh+dt@...nel.org,
        mark.rutland@....com
Subject: Re: [RFC/PATCH] net: ethernet: nixge: Use of_get_mac_address()

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@...nel.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@...00000 {
> @@ -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