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Date:   Thu, 25 Apr 2019 22:25:52 +0200
From:   Greg KH <gregkh@linuxfoundation.org>
To:     Dragan Cvetic <dragan.cvetic@xilinx.com>
Cc:     arnd@arndb.de, michal.simek@xilinx.com,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Derek Kiernan <derek.kiernan@xilinx.com>
Subject: Re: [PATCH V2 02/12] misc: xilinx-sdfec: add core driver
Message-ID: <20190425202552.GB22307@kroah.com>
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On Tue, Apr 09, 2019 at 11:06:44AM +0100, Dragan Cvetic wrote:
> +++ b/include/uapi/misc/xilinx_sdfec.h
> @@ -0,0 +1,42 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */

That is not the proper SPDX license for a UAPI kernel header file :(

Please fix this up.

Also, why do you need a uapi file at all?  Who is using these values?

> +/*
> + * Xilinx SD-FEC
> + *
> + * Copyright (C) 2016 - 2017 Xilinx, Inc.
> + *
> + * Description:
> + * This driver is developed for SDFEC16 IP. It provides a char device
> + * in sysfs and supports file operations like open(), close() and ioctl().
> + */
> +#ifndef __XILINX_SDFEC_H__
> +#define __XILINX_SDFEC_H__
> +
> +/**
> + * enum xsdfec_state - State.
> + * @XSDFEC_INIT: Driver is initialized.
> + * @XSDFEC_STARTED: Driver is started.
> + * @XSDFEC_STOPPED: Driver is stopped.
> + * @XSDFEC_NEEDS_RESET: Driver needs to be reset.
> + * @XSDFEC_PL_RECONFIGURE: Programmable Logic needs to be recofigured.
> + *
> + * This enum is used to indicate the state of the driver.
> + */
> +enum xsdfec_state {
> +	XSDFEC_INIT = 0,
> +	XSDFEC_STARTED,
> +	XSDFEC_STOPPED,
> +	XSDFEC_NEEDS_RESET,
> +	XSDFEC_PL_RECONFIGURE,
> +};
> +
> +/**
> + * struct xsdfec_config - Configuration of SD-FEC core.
> + * @fec_id: ID of SD-FEC instance. ID is limited to the number of active
> + *          SD-FEC's in the FPGA and is related to the driver instance
> + *          Minor number.
> + */
> +struct xsdfec_config {
> +	s32 fec_id;

What is this structure for and why are you telling userspace about it?
If you are telling userspace about it, you are using the wrong data
type :(

thanks,

greg k-h