[PATCH 07/12] of/device: Add input id to of_dma_configure()

[Rob Herring]

On Thu, May 21, 2020 at 7:00 AM Lorenzo Pieralisi
<lorenzo.pieralisi at arm.com> wrote:
>
> Devices sitting on proprietary busses have a device ID space that
> is owned by the respective bus and related firmware bindings. In order
> to let the generic OF layer handle the input translations to
> an IOMMU id, for such busses the current of_dma_configure() interface
> should be extended in order to allow the bus layer to provide the
> device input id parameter - that is retrieved/assigned in bus
> specific code and firmware.
>
> Augment of_dma_configure() to add an optional input_id parameter,
> leaving current functionality unchanged.
>
> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi at arm.com>
> Cc: Rob Herring <robh+dt at kernel.org>
> Cc: Robin Murphy <robin.murphy at arm.com>
> Cc: Joerg Roedel <joro at 8bytes.org>
> Cc: Laurentiu Tudor <laurentiu.tudor at nxp.com>
> ---
>  drivers/bus/fsl-mc/fsl-mc-bus.c |  4 ++-
>  drivers/iommu/of_iommu.c        | 53 +++++++++++++++++++++------------
>  drivers/of/device.c             |  8 +++--
>  include/linux/of_device.h       | 16 ++++++++--
>  include/linux/of_iommu.h        |  6 ++--
>  5 files changed, 60 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
> index 40526da5c6a6..8ead3f0238f2 100644
> --- a/drivers/bus/fsl-mc/fsl-mc-bus.c
> +++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
> @@ -118,11 +118,13 @@ static int fsl_mc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
>  static int fsl_mc_dma_configure(struct device *dev)
>  {
>         struct device *dma_dev = dev;
> +       struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
> +       u32 input_id = mc_dev->icid;
>
>         while (dev_is_fsl_mc(dma_dev))
>                 dma_dev = dma_dev->parent;
>
> -       return of_dma_configure(dev, dma_dev->of_node, 0);
> +       return of_dma_configure_id(dev, dma_dev->of_node, 0, &input_id);
>  }
>
>  static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
> diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
> index ad96b87137d6..4516d5bf6cc9 100644
> --- a/drivers/iommu/of_iommu.c
> +++ b/drivers/iommu/of_iommu.c
> @@ -139,25 +139,53 @@ static int of_pci_iommu_init(struct pci_dev *pdev, u16 alias, void *data)
>         return err;
>  }
>
> -static int of_fsl_mc_iommu_init(struct fsl_mc_device *mc_dev,
> -                               struct device_node *master_np)
> +static int of_iommu_configure_dev_id(struct device_node *master_np,
> +                                    struct device *dev,
> +                                    const u32 *id)

Should have read this patch before #6. I guess you could still make
of_pci_iommu_init() call
of_iommu_configure_dev_id.

Rob