linux-kernel - Re: [PATCH v8 4/4] media: i2c: Add RDACM20 driver

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Date:   Mon, 11 May 2020 12:20:30 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        linux-renesas-soc@...r.kernel.org, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Kieran Bingham <kieran.bingham@...asonboard.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Jacopo Mondi <jacopo@...ndi.org>,
        Niklas Söderlund <niklas.soderlund@...natech.se>,
        sakari.ailus@....fi, Hyun Kwon <hyunk@...inx.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v8 4/4] media: i2c: Add RDACM20 driver

On 17/04/2020 12:34, Kieran Bingham wrote:
> From: Jacopo Mondi <jacopo+renesas@...ndi.org>
> 
> The RDACM20 is a GMSL camera supporting 1280x800 resolution images
> developed by IMI based on an Omnivision 10635 sensor and a Maxim MAX9271
> GMSL serializer.
> 
> The GMSL link carries power, control (I2C) and video data over a
> single coax cable.
> 
> Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
> Reviewed-by: Rob Herring <robh@...nel.org>
> 
> ---

<snip>

> diff --git a/drivers/media/i2c/rdacm20.c b/drivers/media/i2c/rdacm20.c
> new file mode 100644
> index 000000000000..37786998878b
> --- /dev/null
> +++ b/drivers/media/i2c/rdacm20.c
> @@ -0,0 +1,668 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * IMI RDACM20 GMSL Camera Driver
> + *
> + * Copyright (C) 2017-2020 Jacopo Mondi
> + * Copyright (C) 2017-2020 Kieran Bingham
> + * Copyright (C) 2017-2019 Laurent Pinchart
> + * Copyright (C) 2017-2019 Niklas Söderlund
> + * Copyright (C) 2016 Renesas Electronics Corporation
> + * Copyright (C) 2015 Cogent Embedded, Inc.
> + */
> +
> +/*
> + * The camera is made of an Omnivision OV10635 sensor connected to a Maxim
> + * MAX9271 GMSL serializer.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/fwnode.h>
> +#include <linux/init.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/slab.h>
> +#include <linux/videodev2.h>
> +
> +#include <media/v4l2-async.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-subdev.h>
> +
> +#include "max9271.h"
> +
> +#define OV10635_I2C_ADDRESS		0x30
> +
> +#define OV10635_SOFTWARE_RESET		0x0103
> +#define OV10635_PID			0x300a
> +#define OV10635_VER			0x300b
> +#define OV10635_SC_CMMN_SCCB_ID		0x300c
> +#define OV10635_SC_CMMN_SCCB_ID_SELECT	BIT(0)
> +#define OV10635_VERSION			0xa635
> +
> +#define OV10635_WIDTH			1280
> +#define OV10635_HEIGHT			800
> +#define OV10635_FORMAT			MEDIA_BUS_FMT_UYVY8_2X8

This OV10635_FORMAT define was very confusing when I reviewed this code.

Please just use MEDIA_BUS_FMT_UYVY8_2X8 directly instead of introducing
an alias. While reviewing I thought for a moment that OV10635_FORMAT was
somehow a new mediabus format that was added elsewhere. I had to dig into
the code to figure out that it really was an alias.

Regards,

	Hans