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SubjectRe: [PATCH] net: mdio-gpio: Allow for unspecified bus id
On 05/08/2015 05:48 PM, Andrew Lunn wrote:
> On Fri, May 08, 2015 at 04:18:49PM +0200, Bert Vermeulen wrote:
>> When the bus id was supplied via a struct platform_device, the driver wasn't
>> handling -1 to mean an unspecified id of the only instance of this driver,
>> as the platform spec requires.
>>
>> Signed-off-by: Bert Vermeulen <bert@biot.com>
>> ---
>> drivers/net/phy/mdio-gpio.c | 5 ++++-
>> 1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/phy/mdio-gpio.c b/drivers/net/phy/mdio-gpio.c
>> index f5cddf5..7bd90db 100644
>> --- a/drivers/net/phy/mdio-gpio.c
>> +++ b/drivers/net/phy/mdio-gpio.c
>> @@ -165,7 +165,10 @@ static struct mii_bus *mdio_gpio_bus_init(struct device *dev,
>> if (!new_bus->irq[i])
>> new_bus->irq[i] = PHY_POLL;
>>
>> - snprintf(new_bus->id, MII_BUS_ID_SIZE, "gpio-%x", bus_id);
>> + if (bus_id != -1)
>> + snprintf(new_bus->id, MII_BUS_ID_SIZE, "gpio-%x", bus_id);
>> + else
>> + strncpy(new_bus->id, "gpio", MII_BUS_ID_SIZE);
>
> Hi Bert
>
> What happens if there are multiple platform_device's with -1? You
> should probably be using use idr_alloc().

It's an instance id per driver, not globally, and -1 specifically means it's
the only instance. From Documentation/driver-model/platform.txt:

> These are concatenated, so name/id "serial"/0 indicates bus_id "serial.0", and
> "serial/3" indicates bus_id "serial.3"; both would use the platform_driver
> named "serial". While "my_rtc"/-1 would be bus_id "my_rtc" (no instance id)
> and use the platform_driver called "my_rtc".


--
Bert Vermeulen bert@biot.com email/xmpp


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