Re: [PATCH v9 0/5] staging: vc04_services: vchiq: Register devices with a custom bus_type

[Stefan Wahren]

Hi Umang,

Am 19.07.23 um 18:54 schrieb Umang Jain:
> Hi,
>
> One comment,
>
> On 7/19/23 10:14 PM, Umang Jain wrote:
> > The patch series added a new bus type vchiq_bus_type and registers
> > child devices in order to move them away from using platform
> > device/driver.
> >
> > Patch 1/5 and 2/5 adds a new bus_type and registers them to vchiq
> > interface
> >
> > Patch 3/5 and 4/5 moves the bcm2835-camera and bcm2835-audio
> > to the new bus respectively
> >
> > Patch 5/5 removes a platform registeration helper which is no
> > longer required.
> >
> > Changes in v9:
> > - Fix module autoloading
>
> While the autoloading of bcm2835-audio, bcm2835-camera is fixed as part 
> of this series, there is one WARN coming in when bcm2835-audio is loaded 
> regarding dma_alloc_attr
>
> dmesg output: https://paste.debian.net/plain/1286359

is it possible that after your patch series no DMA mask like 
DMA_BIT_MASK(32) is provided?

> I am investigating further...
> > - Implement bus_type's probe() callback to load drivers
> > - Implement bus_type's uevent() to make sure appropriate drivers are
> >    loaded when device are registed from vchiq.
> >
> > Changes in v8:
> > - Drop dual licensing. Instead use GPL-2.0 only for patch 1/5
> >
> > Changes in v7:
> > (5 out of 6 patches from v6 merged)
> > - Split the main patch (6/6) as requested.
> > - Use struct vchiq_device * instead of struct device * in
> >    all bus functions.
> > - Drop additional name attribute displayed in sysfs (redundant info)
> > - Document vchiq_interface doesn't enumerate device discovery
> > - remove EXPORT_SYMBOL_GPL(vchiq_bus_type)
> >
> > Changes in v6:
> > - Split struct device and struct driver wrappers in vchiq_device.[ch]
> > - Move vchiq_bus_type definition to vchiq_device.[ch] as well
> > - return error on bus_register() failure
> > - drop dma_set_mask_and_coherent
> > - trivial variable name change
> >
> > Changes in v5:
> > - Fixup missing "staging: " in commits' subject line
> > - No code changes from v4
> >
> > Changes in v4:
> > - Introduce patches to drop include directives from Makefile
> >
> > Changes in v3:
> > - Rework entirely to replace platform devices/driver model
> >
> > -v2:
> > https://lore.kernel.org/all/20221222191500.515795-1-umang.jain@xxxxxxxxxxxxxxxx/
> >
> > -v1:
> > https://lore.kernel.org/all/20221220084404.19280-1-umang.jain@xxxxxxxxxxxxxxxx/
> >
> > Umang Jain (5):
> >    staging: vc04_services: vchiq_arm: Add new bus type and device type
> >    staging: vc04_services: vchiq_arm: Register vchiq_bus_type
> >    staging: bcm2835-camera: Register bcm2835-camera with vchiq_bus_type
> >    staging: bcm2835-audio: Register bcm2835-audio with vchiq_bus_type
> >    staging: vc04_services: vchiq_arm: Remove vchiq_register_child()
> >
> >   drivers/staging/vc04_services/Makefile        |   1 +
> >   .../vc04_services/bcm2835-audio/bcm2835.c     |  20 ++--
> >   .../bcm2835-camera/bcm2835-camera.c           |  17 +--
> >   .../interface/vchiq_arm/vchiq_arm.c           |  48 ++++-----
> >   .../interface/vchiq_arm/vchiq_device.c        | 102 ++++++++++++++++++
> >   .../interface/vchiq_arm/vchiq_device.h        |  54 ++++++++++
> >   6 files changed, 196 insertions(+), 46 deletions(-)
> >   create mode 100644 
> > drivers/staging/vc04_services/interface/vchiq_arm/vchiq_device.c
> >   create mode 100644 
> > drivers/staging/vc04_services/interface/vchiq_arm/vchiq_device.h