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SubjectRe: [PATCH 1/3] rpmsg: core: export rpmsg bus type
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On 02/03/18 14:55, srinivas.kandagatla@linaro.org wrote:
> From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
>
> Export rpmsg bus type so that iommu drivers iommu ops to
> rpmsg bus type.
>
> On Qualcomm SoCs ADSP exposes functions like audio and
> other which need iommu access, as these drivers are part
> of rpmsg bus, able to allocate memory from iommus is basic
> requirement. So expose this bus so that iommu drivers can
> add ops to this.

IOMMU drivers are built-in while rpmsg can be built as a module, so that
isn't always going to work.

Robin.

> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
> ---
> drivers/rpmsg/rpmsg_core.c | 3 ++-
> include/linux/rpmsg.h | 2 +-
> 2 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c
> index 5a081762afcc..e84c71f8d6ab 100644
> --- a/drivers/rpmsg/rpmsg_core.c
> +++ b/drivers/rpmsg/rpmsg_core.c
> @@ -465,7 +465,7 @@ static int rpmsg_dev_remove(struct device *dev)
> return err;
> }
>
> -static struct bus_type rpmsg_bus = {
> +struct bus_type rpmsg_bus = {
> .name = "rpmsg",
> .match = rpmsg_dev_match,
> .dev_groups = rpmsg_dev_groups,
> @@ -473,6 +473,7 @@ static struct bus_type rpmsg_bus = {
> .probe = rpmsg_dev_probe,
> .remove = rpmsg_dev_remove,
> };
> +EXPORT_SYMBOL(rpmsg_bus);
>
> int rpmsg_register_device(struct rpmsg_device *rpdev)
> {
> diff --git a/include/linux/rpmsg.h b/include/linux/rpmsg.h
> index ca07366c4c33..869e5946b7df 100644
> --- a/include/linux/rpmsg.h
> +++ b/include/linux/rpmsg.h
> @@ -49,7 +49,7 @@ struct rpmsg_device;
> struct rpmsg_endpoint;
> struct rpmsg_device_ops;
> struct rpmsg_endpoint_ops;
> -
> +extern struct bus_type rpmsg_bus;
> /**
> * struct rpmsg_channel_info - channel info representation
> * @name: name of service
>

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