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SubjectRe: [PATCH] net: phy: add driver for Motorcomm yt8511 phy
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On 19.05.2021 10:18, Leon Romanovsky wrote:
> On Tue, May 18, 2021 at 08:20:03PM -0400, Peter Geis wrote:
>> On Tue, May 18, 2021 at 4:59 AM Leon Romanovsky <leon@kernel.org> wrote:
>>>
>>> On Tue, May 11, 2021 at 05:46:06PM -0400, Peter Geis wrote:
>>>> Add a driver for the Motorcomm yt8511 phy that will be used in the
>>>> production Pine64 rk3566-quartz64 development board.
>>>> It supports gigabit transfer speeds, rgmii, and 125mhz clk output.
>>>>
>>>> Signed-off-by: Peter Geis <pgwipeout@gmail.com>
>>>> ---
>>>> MAINTAINERS | 6 +++
>>>> drivers/net/phy/Kconfig | 6 +++
>>>> drivers/net/phy/Makefile | 1 +
>>>> drivers/net/phy/motorcomm.c | 85 +++++++++++++++++++++++++++++++++++++
>>>> 4 files changed, 98 insertions(+)
>>>> create mode 100644 drivers/net/phy/motorcomm.c
>>>
>>> <...>
>>>
>>>> +static const struct mdio_device_id __maybe_unused motorcomm_tbl[] = {
>>>> + { PHY_ID_MATCH_EXACT(PHY_ID_YT8511) },
>>>> + { /* sentinal */ }
>>>> +}
>>>
>>> Why is this "__maybe_unused"? This *.c file doesn't have any compilation option
>>> to compile part of it.
>>>
>>> The "__maybe_unused" is not needed in this case.
>>
>> I was simply following convention, for example the realtek.c,
>> micrel.c, and smsc.c drivers all have this as well.
>
> Maybe they have a reason, but this specific driver doesn't have such.
>

It's used like this:
MODULE_DEVICE_TABLE(mdio, <mdio_device_id_tbl>);

And MODULE_DEVICE_TABLE is a no-op if MODULE isn't defined:

#ifdef MODULE
/* Creates an alias so file2alias.c can find device table. */
#define MODULE_DEVICE_TABLE(type, name) \
extern typeof(name) __mod_##type##__##name##_device_table \
__attribute__ ((unused, alias(__stringify(name))))
#else /* !MODULE */
#define MODULE_DEVICE_TABLE(type, name)
#endif

In this case the table is unused.

> Thanks
>
>>
>>>
>>> Thanks


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