linux-kernel - Re: [PATCH net-next v5 13/14] microchip: lan865x: add driver support for Microchip's LAN865X MAC-PHY

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Message-ID: <6750b19d-4af3-44c8-90a6-9cb70fcec385@infradead.org>
Date: Mon, 29 Jul 2024 21:15:07 -0700
From: Randy Dunlap <rdunlap@...radead.org>
To: Parthiban Veerasooran <Parthiban.Veerasooran@...rochip.com>,
 davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, horms@...nel.org, saeedm@...dia.com,
 anthony.l.nguyen@...el.com, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, andrew@...n.ch, corbet@....net,
 linux-doc@...r.kernel.org, robh+dt@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
 devicetree@...r.kernel.org, horatiu.vultur@...rochip.com,
 ruanjinjie@...wei.com, steen.hegelund@...rochip.com, vladimir.oltean@....com
Cc: masahiroy@...nel.org, alexanderduyck@...com, krzk+dt@...nel.org,
 robh@...nel.org, hkallweit1@...il.com, linux@...linux.org.uk,
 UNGLinuxDriver@...rochip.com, Thorsten.Kummermehr@...rochip.com,
 Pier.Beruto@...emi.com, Selvamani.Rajagopal@...emi.com,
 Nicolas.Ferre@...rochip.com, benjamin.bigler@...nformulastudent.ch,
 linux@...ler.io
Subject: Re: [PATCH net-next v5 13/14] microchip: lan865x: add driver support
 for Microchip's LAN865X MAC-PHY



On 7/29/24 9:09 PM, Parthiban Veerasooran wrote:
> The LAN8650/1 is designed to conform to the OPEN Alliance 10BASE-T1x
> MAC-PHY Serial Interface specification, Version 1.1. The IEEE Clause 4
> MAC integration provides the low pin count standard SPI interface to any
> microcontroller therefore providing Ethernet functionality without
> requiring MAC integration within the microcontroller. The LAN8650/1
> operates as an SPI client supporting SCLK clock rates up to a maximum of
> 25 MHz. This SPI interface supports the transfer of both data (Ethernet
> frames) and control (register access).
> 
> By default, the chunk data payload is 64 bytes in size. The Ethernet
> Media Access Controller (MAC) module implements a 10 Mbps half duplex
> Ethernet MAC, compatible with the IEEE 802.3 standard. 10BASE-T1S
> physical layer transceiver integrated is into the LAN8650/1. The PHY and
> MAC are connected via an internal Media Independent Interface (MII).
> 
> Signed-off-by: Parthiban Veerasooran <Parthiban.Veerasooran@...rochip.com>
> ---
>  MAINTAINERS                                   |   6 +
>  drivers/net/ethernet/microchip/Kconfig        |   1 +
>  drivers/net/ethernet/microchip/Makefile       |   1 +
>  .../net/ethernet/microchip/lan865x/Kconfig    |  19 +
>  .../net/ethernet/microchip/lan865x/Makefile   |   6 +
>  .../net/ethernet/microchip/lan865x/lan865x.c  | 391 ++++++++++++++++++
>  6 files changed, 424 insertions(+)
>  create mode 100644 drivers/net/ethernet/microchip/lan865x/Kconfig
>  create mode 100644 drivers/net/ethernet/microchip/lan865x/Makefile
>  create mode 100644 drivers/net/ethernet/microchip/lan865x/lan865x.c
> 

> diff --git a/drivers/net/ethernet/microchip/lan865x/Kconfig b/drivers/net/ethernet/microchip/lan865x/Kconfig
> new file mode 100644
> index 000000000000..f3d60d14e202
> --- /dev/null
> +++ b/drivers/net/ethernet/microchip/lan865x/Kconfig
> @@ -0,0 +1,19 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +#
> +# Microchip LAN865x Driver Support
> +#
> +
> +if NET_VENDOR_MICROCHIP
> +
> +config LAN865X
> +	tristate "LAN865x support"
> +	depends on SPI
> +	depends on OA_TC6

Since OA_TC6 is described as a library, it would make sense to select OA_TC6 here instead
of depending on it.
OTOH, that might cause some Kconfig dependency issues... I haven't looked into that.

> +	help
> +	  Support for the Microchip LAN8650/1 Rev.B1 MACPHY Ethernet chip. It
> +	  uses OPEN Alliance 10BASE-T1x Serial Interface specification.
> +
> +	  To compile this driver as a module, choose M here. The module will be
> +	  called lan865x.
> +
> +endif # NET_VENDOR_MICROCHIP


-- 
~Randy