On 5/3/19 11:30 AM, Jean-Jacques Hiblot wrote:
>
> On 29/04/2019 11:56, Marek Vasut wrote:
>> On 4/5/19 2:55 PM, Jean-Jacques Hiblot wrote:
>>> This uclass is intended for devices that do not need any features
>>> from the
>>> uclass, including binding children.
>>> This will typically be used by devices that are used to bind child
>>> devices
>>> but do not use dm_scan_fdt_dev() to do it. That is for example the
>>> case of
>>> several USB wrappers that have 2 child devices (1 for device and 1 for
>>> host) but bind only one at a any given time.
>>>
>>> Signed-off-by: Jean-Jacques Hiblot <jjhib...@ti.com>
>> Could this be UCLASS_BUS or some sort of simple bus ?
>
> The reason we need a new UCLASS is that MISC or SIMPLE_BUS bind all
> their child devices. The dwc3 wrapper and maybe others too, need to bind
> only one of its 2 children (host or device)
You can return -ENODEV from bind for one of the two devices, but maybe
that's not helping you ?
>> Anyway, +CC Simon.
>>
>>> ---
>>>
>>> drivers/core/uclass.c | 5 +++++
>>> include/dm/uclass-id.h | 1 +
>>> 2 files changed, 6 insertions(+)
>>>
>>> diff --git a/drivers/core/uclass.c b/drivers/core/uclass.c
>>> index fc3157de39..dc9eb62893 100644
>>> --- a/drivers/core/uclass.c
>>> +++ b/drivers/core/uclass.c
>>> @@ -757,3 +757,8 @@ int uclass_pre_remove_device(struct udevice *dev)
>>> return 0;
>>> }
>>> #endif
>>> +
>>> +UCLASS_DRIVER(nop) = {
>>> + .id = UCLASS_NOP,
>>> + .name = "nop",
>>> +};
>>> diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
>>> index 86e59781b0..3797cd48f6 100644
>>> --- a/include/dm/uclass-id.h
>>> +++ b/include/dm/uclass-id.h
>>> @@ -61,6 +61,7 @@ enum uclass_id {
>>> UCLASS_MMC, /* SD / MMC card or chip */
>>> UCLASS_MOD_EXP, /* RSA Mod Exp device */
>>> UCLASS_MTD, /* Memory Technology Device (MTD) device */
>>> + UCLASS_NOP, /* No-op devices */
>>> UCLASS_NORTHBRIDGE, /* Intel Northbridge / SDRAM controller */
>>> UCLASS_NVME, /* NVM Express device */
>>> UCLASS_PANEL, /* Display panel, such as an LCD */
>>>
>>
--
Best regards,
Marek Vasut
_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
https://lists.denx.de/listinfo/u-boot
