linux-kernel - Re: [PATCH] [linux][master][v1] misc: Add Xilinx ZYNQMP VCU logicoreIP init driver

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Date:   Tue, 5 Dec 2017 14:30:02 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Dhaval Shah <dhaval.shah@...inx.com>
Cc:     arnd@...db.de, linux-kernel@...r.kernel.org,
        michal.simek@...inx.com, hyunk@...inx.com,
        Dhaval Shah <dshah@...inx.com>
Subject: Re: [PATCH] [linux][master][v1] misc: Add Xilinx ZYNQMP VCU
 logicoreIP init driver

On Tue, Dec 05, 2017 at 03:43:32AM -0800, Dhaval Shah wrote:
> Xilinx ZYNQMP VCU Init driver is based on the new LogiCoreIP design
> created. This driver will provide the api which can be used
> by the encoder and decoder driver to get the configured value.

Your subject has a lot of [] in it, none of that is needed except the
[PATCH] one :)

> 
> Signed-off-by: Dhaval Shah <dshah@...inx.com>
> ---
>  drivers/misc/Kconfig    |   6 +
>  drivers/misc/Makefile   |   1 +
>  drivers/misc/xlnx_vcu.c | 664 ++++++++++++++++++++++++++++++++++++++++++++++++
>  include/misc/xlnx_vcu.h |  18 ++
>  4 files changed, 689 insertions(+)
>  create mode 100644 drivers/misc/xlnx_vcu.c
>  create mode 100644 include/misc/xlnx_vcu.h
> 
> diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
> index f1a5c23..3b7c796 100644
> --- a/drivers/misc/Kconfig
> +++ b/drivers/misc/Kconfig
> @@ -496,6 +496,12 @@ config PCI_ENDPOINT_TEST
>             Enable this configuration option to enable the host side test driver
>             for PCI Endpoint.
>  
> +config XILINX_VCU
> +       tristate "Xilinx VCU Init"
> +       default n

That's always the default, no need for this.

> +       help
> +          Driver for the Xilinx VCU Init based on the logicoreIP.

You need a lot more help text here to explain what this driver is, what
it is for, and who would need it.

Also, why is this a misc driver?

> --- /dev/null
> +++ b/drivers/misc/xlnx_vcu.c
> @@ -0,0 +1,664 @@
> +/*
> + * Xilinx VCU Init
> + *
> + * Copyright (C) 2016 - 2017 Xilinx, Inc.
> + *
> + * Contacts   Dhaval Shah <dshah@...inx.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0

That line goes at the top of the file with // in front of it.


> + */
> +#include <linux/clk.h>
> +#include <linux/device.h>
> +#include <linux/errno.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +
> +#include <misc/xlnx_vcu.h>

Why do you need a .h file for a single driver?

> +/**
> + * xvcu_get_color_depth - read the color depth register
> + * @xvcu:	Pointer to the xvcu_device structure
> + *
> + * Return:	Returns 32bit value
> + *
> + */
> +u32 xvcu_get_color_depth(struct xvcu_device *xvcu)
> +{
> +	return xvcu_read(xvcu->logicore_reg_ba, VCU_ENC_COLOR_DEPTH);
> +}
> +EXPORT_SYMBOL_GPL(xvcu_get_color_depth);

Why is your driver exporting symbols that no one uses?

This feels very odd...

greg k-h