[PATCH V7 06/11] of/acpi: Configure dma operations at probe time for platform/amba/pci bus devices

[Rafael J. Wysocki]

On Mon, Jan 23, 2017 at 5:18 PM, Sricharan R <sricharan at codeaurora.org> wrote:
> Configuring DMA ops at probe time will allow deferring device probe when
> the IOMMU isn't available yet. The dma_configure for the device is
> now called from the generic device_attach callback just before the
> bus/driver probe is called. This way, configuring the DMA ops for the
> device would be called at the same place for all bus_types, hence the
> deferred probing mechanism should work for all buses as well.
>
> pci_bus_add_devices    (platform/amba)(_device_create/driver_register)
>        |                         |
> pci_bus_add_device     (device_add/driver_register)
>        |                         |
> device_attach           device_initial_probe
>        |                         |
> __device_attach_driver    __device_attach_driver
>        |
> driver_probe_device
>        |
> really_probe
>        |
> dma_configure
>
> Similarly on the device/driver_unregister path __device_release_driver is
> called which inturn calls dma_deconfigure.
>
> This patch changes the dma ops configuration to probe time for
> both OF and ACPI based platform/amba/pci bus devices.
>
> Signed-off-by: Sricharan R <sricharan at codeaurora.org>

Acked-by: Rafael J. Wysocki <rafael.j.wysocki at intel.com>