linux-kernel - Re: [PATCH v3 6/7] platform/mellanox: Introduce support for Mellanox register access driver

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Date:   Sun, 27 May 2018 17:13:47 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Vadim Pasternak <vadimp@...lanox.com>
Cc:     dvhart@...radead.org, andy.shevchenko@...il.com,
        linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        jiri@...nulli.us, michaelsh@...lanox.com, ivecera@...hat.com
Subject: Re: [PATCH v3 6/7] platform/mellanox: Introduce support for Mellanox
 register access driver

On Sun, May 27, 2018 at 04:47:43PM +0000, Vadim Pasternak wrote:
> Introduce new Mellanox platform driver to allow access to Mellanox
> programmable device register space trough sysfs interface.
> The driver purpose is to provide sysfs interface for user space for the
> registers essential for system control and monitoring.
> The sets of registers for sysfs access are supposed to be defined per
> system type bases and include the registers related to system resets
> operation, system reset causes monitoring and some kinds of mux selection.
> 
> Signed-off-by: Vadim Pasternak <vadimp@...lanox.com>
> ---
> v1->v2:
>  Changed added by Vadim:
>  - Change ---help--- to help in Kconfig, according to new requirements;
> v2->v3:
>  Comments pointed out by Darren:
>  - Remove conditional assignment per attribute mode type, because mode
>    will guard against not permitted access.
>    Verified by Vadim.
> ---
>  drivers/platform/mellanox/Kconfig     |  11 ++
>  drivers/platform/mellanox/Makefile    |   1 +
>  drivers/platform/mellanox/mlxreg-io.c | 203 ++++++++++++++++++++++++++++++++++
>  3 files changed, 215 insertions(+)
>  create mode 100644 drivers/platform/mellanox/mlxreg-io.c
> 
> diff --git a/drivers/platform/mellanox/Kconfig b/drivers/platform/mellanox/Kconfig
> index 591bccd..ddfae9fc 100644
> --- a/drivers/platform/mellanox/Kconfig
> +++ b/drivers/platform/mellanox/Kconfig
> @@ -23,4 +23,15 @@ config MLXREG_HOTPLUG
>  	  This driver handles hot-plug events for the power suppliers, power
>  	  cables and fans on the wide range Mellanox IB and Ethernet systems.
>  
> +config MLXREG_IO
> +	tristate "Mellanox platform register access driver support"
> +	depends on REGMAP
> +	depends on HWMON
> +	help
> +	  This driver allows access to Mellanox programmable device register
> +	  space trough sysfs interface. The sets of registers for sysfs access
> +	  are defined per system type bases and includes the registers related
> +	  to system resets operation, system reset causes monitoring and some
> +	  kinds of mux selection.

No Documentation/ABI/ entries for these new sysfs files?  Not good :(

greg k-h