linux-kernel - Re: [PATCH 4/7] mfd: ds90ux9xx: add TI DS90Ux9xx de-/serializer MFD driver

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Date:   Fri, 12 Oct 2018 07:03:14 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Vladimir Zapolskiy <vz@...ia.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Marek Vasut <marek.vasut@...il.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Wolfram Sang <wsa@...-dreams.de>, devicetree@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>
Subject: Re: [PATCH 4/7] mfd: ds90ux9xx: add TI DS90Ux9xx de-/serializer MFD
 driver

On Tue, 09 Oct 2018, Vladimir Zapolskiy wrote:

> From: Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>
> 
> The change adds I2C device driver for TI DS90Ux9xx de-/serializers,
> support of subdevice controllers is done in separate drivers, because
> not all IC functionality may be needed in particular situations, and
> this can be fine grained controlled in device tree.
> 
> The development of the driver was a collaborative work, the
> contribution done by Balasubramani Vivekanandan includes:
> * original implementation of the driver based on a reference driver,
> * regmap powered interrupt controller support on serializers,
> * support of implicitly or improperly specified in device tree ICs,
> * support of device properties and attributes: backward compatible
>   mode, low frequency operation mode, spread spectrum clock generator.
> 
> Contribution by Steve Longerbeam:
> * added ds90ux9xx_read_indirect() function,
> * moved number of links property and added ds90ux9xx_num_fpd_links(),
> * moved and updated ds90ux9xx_get_link_status() function to core driver,
> * added fpd_link_show device attribute.
> 
> Sandeep Jain added support of pixel clock edge configuration.
> 
> Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>
> ---
>  drivers/mfd/Kconfig           |  14 +
>  drivers/mfd/Makefile          |   1 +
>  drivers/mfd/ds90ux9xx-core.c  | 879 ++++++++++++++++++++++++++++++++++
>  include/linux/mfd/ds90ux9xx.h |  42 ++
>  4 files changed, 936 insertions(+)
>  create mode 100644 drivers/mfd/ds90ux9xx-core.c
>  create mode 100644 include/linux/mfd/ds90ux9xx.h
> 
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 8c5dfdce4326..a969fa123f64 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -1280,6 +1280,20 @@ config MFD_DM355EVM_MSP
>  	  boards.  MSP430 firmware manages resets and power sequencing,
>  	  inputs from buttons and the IR remote, LEDs, an RTC, and more.
>  
> +config MFD_DS90UX9XX
> +	tristate "TI DS90Ux9xx FPD-Link de-/serializer driver"
> +	depends on I2C && OF
> +	select MFD_CORE
> +	select REGMAP_I2C
> +	help
> +	  Say yes here to enable support for TI DS90UX9XX de-/serializer ICs.
> +
> +	  This driver provides basic support for setting up the de-/serializer
> +	  chips. Additional functionalities like connection handling to
> +	  remote de-/serializers, I2C bridging, pin multiplexing, GPIO
> +	  controller and so on are provided by separate drivers and should
> +	  enabled individually.

This is not an MFD driver.

After a 30 second Google of what this device actually does, perhaps
drivers/media might be a better fit?

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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