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SubjectRe: [PATCH 3/5] firmware: xilinx: Add zynqmp_get_node_status API
Hi Ben,

On Mon, Feb 24, 2020 at 09:52:29AM -0800, Ben Levinsky wrote:
> This patch adds a new API to provide access to the
> current power state of a sub-system on Zynqmp sub-system.
>
> Signed-off-by: Ben Levinsky <ben.levinsky@xilinx.com>

Patches 1 to 3 look good to me but they will need an R-b from Michal Simek
before it is possible to move foward with them.

Thanks,
Mathieu

> ---
> drivers/firmware/xilinx/zynqmp.c | 42 ++++++++++++++++++++++++++++++++++++
> include/linux/firmware/xlnx-zynqmp.h | 3 +++
> 2 files changed, 45 insertions(+)
>
> diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
> index 486dcb1..98e35d4 100644
> --- a/drivers/firmware/xilinx/zynqmp.c
> +++ b/drivers/firmware/xilinx/zynqmp.c
> @@ -725,6 +725,47 @@ static int zynqmp_pm_request_wakeup(const u32 node,
> }
>
> /**
> + * zynqmp_pm_get_node_status - PM call to request a node's current power state
> + * @node: ID of the component or sub-system in question
> + * @status: Current operating state of the requested node
> + * @requirements: Current requirements asserted on the node,
> + * used for slave nodes only.
> + * @usage: Usage information, used for slave nodes only:
> + * PM_USAGE_NO_MASTER - No master is currently using
> + * the node
> + * PM_USAGE_CURRENT_MASTER - Only requesting master is
> + * currently using the node
> + * PM_USAGE_OTHER_MASTER - Only other masters are
> + * currently using the node
> + * PM_USAGE_BOTH_MASTERS - Both the current and at least
> + * one other master is currently
> + * using the node
> + *
> + * Return: Returns status, either success or error+reason
> + */
> +static int zynqmp_pm_get_node_status(const u32 node, u32 *const status,
> + u32 *const requirements, u32 *const usage)
> +{
> + u32 ret_payload[PAYLOAD_ARG_CNT];
> + int ret;
> +
> + if (!status)
> + return -EINVAL;
> +
> + ret = zynqmp_pm_invoke_fn(PM_GET_NODE_STATUS, node, 0, 0,
> + 0, ret_payload);
> + if (ret_payload[0] == XST_PM_SUCCESS) {
> + *status = ret_payload[1];
> + if (requirements)
> + *requirements = ret_payload[2];
> + if (usage)
> + *usage = ret_payload[3];
> + }
> +
> + return ret;
> +}
> +
> +/**
> * zynqmp_pm_set_requirement() - PM call to set requirement for PM slaves
> * @node: Node ID of the slave
> * @capabilities: Requested capabilities of the slave
> @@ -769,6 +810,7 @@ static const struct zynqmp_eemi_ops eemi_ops = {
> .set_requirement = zynqmp_pm_set_requirement,
> .fpga_load = zynqmp_pm_fpga_load,
> .fpga_get_status = zynqmp_pm_fpga_get_status,
> + .get_node_status = zynqmp_pm_get_node_status,
> };
>
> /**
> diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
> index 0a68849..fb4efc9 100644
> --- a/include/linux/firmware/xlnx-zynqmp.h
> +++ b/include/linux/firmware/xlnx-zynqmp.h
> @@ -62,6 +62,7 @@
>
> enum pm_api_id {
> PM_GET_API_VERSION = 1,
> + PM_GET_NODE_STATUS = 3,
> PM_REQUEST_NODE = 13,
> PM_RELEASE_NODE,
> PM_SET_REQUIREMENT,
> @@ -309,6 +310,8 @@ struct zynqmp_pm_query_data {
> struct zynqmp_eemi_ops {
> int (*get_api_version)(u32 *version);
> int (*get_chipid)(u32 *idcode, u32 *version);
> + int (*get_node_status)(const u32 node, u32 *const status,
> + u32 *const requirements, u32 *const usage);
> int (*fpga_load)(const u64 address, const u32 size, const u32 flags);
> int (*fpga_get_status)(u32 *value);
> int (*query_data)(struct zynqmp_pm_query_data qdata, u32 *out);
> --
> 2.7.4
>

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