On Sat, Jun 02, 2018 at 01:56:08AM +0530, Vikash Garodia wrote:
> A separate child device is added for video firmware.
> This is needed to
> [1] configure the firmware context bank with the desired SID.
> [2] ensure that the iova for firmware region is from 0x0.
>
> Signed-off-by: Vikash Garodia <vgarodia@xxxxxxxxxxxxxx>
> ---
> .../devicetree/bindings/media/qcom,venus.txt | 8 +++-
> drivers/media/platform/qcom/venus/core.c | 48 +++++++++++++++++++---
> drivers/media/platform/qcom/venus/firmware.c | 20 ++++++++-
> drivers/media/platform/qcom/venus/firmware.h | 2 +
> 4 files changed, 71 insertions(+), 7 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/media/qcom,venus.txt b/Documentation/devicetree/bindings/media/qcom,venus.txt
> index 00d0d1b..701cbe8 100644
> --- a/Documentation/devicetree/bindings/media/qcom,venus.txt
> +++ b/Documentation/devicetree/bindings/media/qcom,venus.txt
> @@ -53,7 +53,7 @@
>
> * Subnodes
> The Venus video-codec node must contain two subnodes representing
> -video-decoder and video-encoder.
> +video-decoder and video-encoder, one optional firmware subnode.
>
> Every of video-encoder or video-decoder subnode should have:
>
> @@ -79,6 +79,8 @@ Every of video-encoder or video-decoder subnode should have:
> power domain which is responsible for collapsing
> and restoring power to the subcore.
>
> +The firmware sub node must contain the iommus specifiers for ARM9.
> +
> * An Example
> video-codec@1d00000 {
> compatible = "qcom,msm8916-venus";
> @@ -105,4 +107,8 @@ Every of video-encoder or video-decoder subnode should have:
> clock-names = "core";
> power-domains = <&mmcc VENUS_CORE1_GDSC>;
> };
> + venus-firmware {
> + compatible = "qcom,venus-firmware-no-tz";
> + iommus = <&apps_smmu 0x10b2 0x0>;
This mostly looks like you are adding a node in order to create a
platform device. DT is not the only way to create platform devices and
shouldn't be used when the device is not really a separate h/w device.
Plus it seems like it is debatable that you even need a driver.
For iommus, just move it up to the parent (or add to existing prop).
Rob
