Hi,
On Wed, 2018-09-05 at 12:39 +0530, Nava kishore Manne wrote:
> This Patch Adds reset API's to support release, assert
> and status functionalities by using firmware interface.
>
> Signed-off-by: Nava kishore Manne <nava.manne@xxxxxxxxxx>
> ---
> Changes for v3:
> -None.
> Changes for v2:
> -New Patch.
>
> drivers/firmware/xilinx/zynqmp.c | 40 +++++++++++
> include/linux/firmware/xlnx-zynqmp.h | 136 +++++++++++++++++++++++++++++++++++
> 2 files changed, 176 insertions(+)
>
> diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
> index 7ccedf0..639c72f 100644
> --- a/drivers/firmware/xilinx/zynqmp.c
> +++ b/drivers/firmware/xilinx/zynqmp.c
> @@ -447,6 +447,44 @@ static int zynqmp_pm_clock_getparent(u32 clock_id, u32 *parent_id)
> return ret;
> }
>
> +/**
> + * zynqmp_pm_reset_assert - Request setting of reset (1 - assert, 0 - release)
> + * @reset: Reset to be configured
> + * @assert_flag: Flag stating should reset be asserted (1) or
> + * released (0)
> + *
> + * Return: Returns status, either success or error+reason
> + */
> +static int zynqmp_pm_reset_assert(const enum zynqmp_pm_reset reset,
> + const enum zynqmp_pm_reset_action assert_flag)
> +{
> + return zynqmp_pm_invoke_fn(PM_RESET_ASSERT, reset, assert_flag,
> + 0, 0, NULL);
> +}
> +
> +/**
> + * zynqmp_pm_reset_get_status - Get status of the reset
> + * @reset: Reset whose status should be returned
> + * @status: Returned status
> + *
> + * Return: Returns status, either success or error+reason
> + */
> +static int zynqmp_pm_reset_get_status(const enum zynqmp_pm_reset reset,
> + u32 *status)
> +{
> + u32 ret_payload[PAYLOAD_ARG_CNT];
> + int ret;
> +
> + if (!status)
> + return -EINVAL;
> +
> + ret = zynqmp_pm_invoke_fn(PM_RESET_GET_STATUS, reset, 0,
> + 0, 0, ret_payload);
> + *status = ret_payload[1];
It doesn't really matter here, but in general I'd skip writing output
arguments in case of error.
For all I know, the result returned in ret_payload could be undefined.
regards
Philipp
