[PATCH 1/4] USB: Fix of_usb_get_dr_mode_by_phy with a shared phy block

[hdegoede@redhat.com (Hans de Goede)]

Hi,

On 03-06-16 13:20, Kishon Vijay Abraham I wrote:
> Hi,
>
> On Thursday 02 June 2016 11:01 PM, Hans de Goede wrote:
>> Some SoCs have a single phy-hw-block with multiple phys, this is
>> modelled by a single phy dts node, so we end up with multiple
>> controller nodes with a phys property pointing to the phy-node
>> of the otg-phy.
>
> Maybe we should try to model each phy with a separate dt node?

That seems like making things unnecessarily complicated. If we want
to be 100% sure that of_usb_get_dr_mode_by_phy finds the right
controller, we could add an "int index" parameter to of_usb_get_dr_mode_by_phy
and make it check that first argument specified to the phandle
used in the controller node matches the passed in index.

And use index == -1 to skip this test.

Regards,

Hans



>
> Thanks
> Kishon
>>
>> Only one of these controllers typically is an otg controller, yet we
>> were checking the first controller who uses a phy from the block and
>> then end up looking for a dr_mode property in e.g. the ehci controller.
>>
>> Instead of looking for nodes with a phy property, look for nodes
>> with a dr_mode property, so that we actually access the dr_mode property
>> in a node which has it.
>>
>> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
>> ---
>>  drivers/usb/common/common.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
>> index e3d0161..9806433 100644
>> --- a/drivers/usb/common/common.c
>> +++ b/drivers/usb/common/common.c
>> @@ -145,7 +145,7 @@ enum usb_dr_mode of_usb_get_dr_mode_by_phy(struct device_node *phy_np)
>>  	int err;
>>
>>  	do {
>> -		controller = of_find_node_with_property(controller, "phys");
>> +		controller = of_find_node_with_property(controller, "dr_mode");
>>  		index = 0;
>>  		do {
>>  			phy = of_parse_phandle(controller, "phys", index);
>>