[RESEND PATCH v6 13/14] iommu/rockchip: Add runtime PM support

Tomasz Figa tfiga at chromium.org
Mon Mar 5 18:04:48 PST 2018

Hi Jeffy,

On Tue, Mar 6, 2018 at 10:57 AM, JeffyChen <jeffy.chen at rock-chips.com> wrote:
> Hi Tomasz,
> Thanks for your reply.
> On 03/05/2018 09:49 PM, Tomasz Figa wrote:
>>> >  struct rk_iommudata {
>>> >+       struct device_link *link; /* runtime PM link from IOMMU to
>>> > master */
>> Kerneldoc comment for the struct could be added instead.
> i saw this in the kerneldoc:
> * An MMU device exists alongside a busmaster device, both are in the same
>   power domain.  The MMU implements DMA address translation for the
> busmaster
>   device and shall be runtime resumed and kept active whenever and as long
>   as the busmaster device is active.  The busmaster device's driver shall
>   not bind before the MMU is bound.  To achieve this, a device link with
>   runtime PM integration is added from the busmaster device (consumer)
>   to the MMU device (supplier).  The effect with regards to runtime PM
>   is the same as if the MMU was the parent of the master device.
> maybe we can use something like:
> device link with runtime PM integration from the master (consumer) to the
> IOMMU (supplier).

Sorry, I meant that kerneldoc comment style could be used to document
this struct.


Best regards,

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