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SubjectRe: [PATCH v3 1/2] of_net: Implement of_get_nvmem_mac_address helper
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On 28-03-18 00:50, Florian Fainelli wrote:
> On 03/27/2018 02:52 AM, 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.
>>
>> Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
>> ---
>> Documentation/devicetree/bindings/net/ethernet.txt | 2 ++
>> drivers/of/of_net.c | 40 ++++++++++++++++++++++
>> include/linux/of_net.h | 6 ++++
>> 3 files changed, 48 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/net/ethernet.txt b/Documentation/devicetree/bindings/net/ethernet.txt
>> index 2974e63..cfc376b 100644
>> --- a/Documentation/devicetree/bindings/net/ethernet.txt
>> +++ b/Documentation/devicetree/bindings/net/ethernet.txt
>> @@ -10,6 +10,8 @@ Documentation/devicetree/bindings/phy/phy-bindings.txt.
>> the boot program; should be used in cases where the MAC address assigned to
>> the device by the boot program is different from the "local-mac-address"
>> property;
>> +- nvmem-cells: phandle, reference to an nvmem node for the MAC address;
>> +- nvmem-cell-names: string, should be "mac-address" if nvmem is to be used;
>> - max-speed: number, specifies maximum speed in Mbit/s supported by the device;
>> - max-frame-size: number, maximum transfer unit (IEEE defined MTU), rather than
>> the maximum frame size (there's contradiction in the Devicetree
>> diff --git a/drivers/of/of_net.c b/drivers/of/of_net.c
>> index d820f3e..1c5d372 100644
>> --- a/drivers/of/of_net.c
>> +++ b/drivers/of/of_net.c
>> @@ -7,6 +7,7 @@
>> */
>> #include <linux/etherdevice.h>
>> #include <linux/kernel.h>
>> +#include <linux/nvmem-consumer.h>
>> #include <linux/of_net.h>
>> #include <linux/phy.h>
>> #include <linux/export.h>
>> @@ -80,3 +81,42 @@ const void *of_get_mac_address(struct device_node *np)
>> return of_get_mac_addr(np, "address");
>> }
>> EXPORT_SYMBOL(of_get_mac_address);
>> +
>> +/**
>> + * Obtain the MAC address from an nvmem provider named 'mac-address' through
>> + * device tree.
>> + * On success, copies the new address into memory pointed to by addr and
>> + * returns 0. Returns a negative error code otherwise.
>> + * @np: Device tree node containing the nvmem-cells phandle
>> + * @addr: Pointer to receive the MAC address using ether_addr_copy()
>> + */
>> +int of_get_nvmem_mac_address(struct device_node *np, void *addr)
>> +{
>> + struct nvmem_cell *cell;
>> + const void *mac;
>> + size_t len;
>> + int ret;
>> +
>> + cell = of_nvmem_cell_get(np, "mac-address");
>> + if (IS_ERR(cell))
>> + return PTR_ERR(cell);
>> +
>> + mac = nvmem_cell_read(cell, &len);
>> +
>> + nvmem_cell_put(cell);
>> +
>> + if (IS_ERR(mac))
>> + return PTR_ERR(mac);
>> +
>> + if (len < 6 || !is_valid_ether_addr(mac)) {
>> + ret = -EINVAL;
>
> Just one nit here, can you use ETH_ALEN instead of 6? With that fixed:
>
> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
>

Ok, implemented and tested it, and v4 is on the way with that change.


Kind regards,

Mike Looijmans
System Expert

TOPIC Products
Materiaalweg 4, NL-5681 RJ Best
Postbus 440, NL-5680 AK Best
Telefoon: +31 (0) 499 33 69 79
E-mail: mike.looijmans@topicproducts.com
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