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Message-ID: <59767fb8-8b9a-472a-884c-009cb00ed0b9@kernel.org>
Date: Tue, 24 Oct 2023 13:57:17 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Parthiban Veerasooran <Parthiban.Veerasooran@...rochip.com>,
davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
pabeni@...hat.com, robh+dt@...nel.org,
krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
corbet@....net, steen.hegelund@...rochip.com,
rdunlap@...radead.org, horms@...nel.org, casper.casan@...il.com,
andrew@...n.ch
Cc: netdev@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
horatiu.vultur@...rochip.com, Woojung.Huh@...rochip.com,
Nicolas.Ferre@...rochip.com, UNGLinuxDriver@...rochip.com,
Thorsten.Kummermehr@...rochip.com
Subject: Re: [PATCH net-next v2 8/9] microchip: lan865x: add driver support
for Microchip's LAN865X MACPHY
On 23/10/2023 17:46, 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. A smaller payload
> data size of 32 bytes is also supported and may be configured in the
> Chunk Payload Size (CPS) field of the Configuration 0 (OA_CONFIG0)
> register. Changing the chunk payload size requires the LAN8650/1 be reset
> and shall not be done during normal operation.
>
> 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 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 | 11 +
> drivers/net/ethernet/microchip/Makefile | 2 +
> drivers/net/ethernet/microchip/lan865x.c | 415 +++++++++++++++++++++++
> 4 files changed, 434 insertions(+)
> create mode 100644 drivers/net/ethernet/microchip/lan865x.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 9580be91f5e9..1b1bd3218a2d 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -14001,6 +14001,12 @@ L: netdev@...r.kernel.org
> S: Maintained
> F: drivers/net/ethernet/microchip/lan743x_*
>
> +MICROCHIP LAN8650/1 10BASE-T1S MACPHY ETHERNET DRIVER
> +M: Parthiban Veerasooran <parthiban.veerasooran@...rochip.com>
> +L: netdev@...r.kernel.org
> +S: Maintained
> +F: drivers/net/ethernet/microchip/lan865x.c
> +
> MICROCHIP LAN87xx/LAN937x T1 PHY DRIVER
> M: Arun Ramadoss <arun.ramadoss@...rochip.com>
> R: UNGLinuxDriver@...rochip.com
> diff --git a/drivers/net/ethernet/microchip/Kconfig b/drivers/net/ethernet/microchip/Kconfig
> index 329e374b9539..596caf59dea6 100644
> --- a/drivers/net/ethernet/microchip/Kconfig
> +++ b/drivers/net/ethernet/microchip/Kconfig
> @@ -59,4 +59,15 @@ source "drivers/net/ethernet/microchip/lan966x/Kconfig"
> source "drivers/net/ethernet/microchip/sparx5/Kconfig"
> source "drivers/net/ethernet/microchip/vcap/Kconfig"
>
> +config LAN865X
> + tristate "LAN865x support"
> + depends on SPI
> + depends on OA_TC6
> + help
> + Support for the Microchip LAN8650/1 Rev.B0 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.
That's odd indentation. Kconfig help goes with tab and two spaces.
> +
> endif # NET_VENDOR_MICROCHIP
> diff --git a/drivers/net/ethernet/microchip/Makefile b/drivers/net/ethernet/microchip/Makefile
> index bbd349264e6f..1fa4e15a067d 100644
> --- a/drivers/net/ethernet/microchip/Makefile
> +++ b/drivers/net/ethernet/microchip/Makefile
> @@ -12,3 +12,5 @@ lan743x-objs := lan743x_main.o lan743x_ethtool.o lan743x_ptp.o
> obj-$(CONFIG_LAN966X_SWITCH) += lan966x/
> obj-$(CONFIG_SPARX5_SWITCH) += sparx5/
> obj-$(CONFIG_VCAP) += vcap/
...
> +static void lan865x_remove(struct spi_device *spi)
> +{
> + struct lan865x_priv *priv = spi_get_drvdata(spi);
> +
> + oa_tc6_exit(priv->tc6);
> + unregister_netdev(priv->netdev);
> + free_netdev(priv->netdev);
> +}
> +
> +#ifdef CONFIG_OF
Drop ifdef
> +static const struct of_device_id lan865x_dt_ids[] = {
> + { .compatible = "microchip,lan865x" },
> + { /* Sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, lan865x_dt_ids);
> +#endif
> +
> +#ifdef CONFIG_ACPI
> +static const struct acpi_device_id lan865x_acpi_ids[] = {
> + { .id = "LAN865X",
> + },
> + {},
> +};
> +MODULE_DEVICE_TABLE(acpi, lan865x_acpi_ids);
> +#endif
> +
> +static struct spi_driver lan865x_driver = {
> + .driver = {
> + .name = DRV_NAME,
> +#ifdef CONFIG_OF
Drop ifdef
> + .of_match_table = lan865x_dt_ids,
> +#endif
> +#ifdef CONFIG_ACPI
Why do you need this ifdef?
> + .acpi_match_table = ACPI_PTR(lan865x_acpi_ids),
> +#endif
> + },
> + .probe = lan865x_probe,
> + .remove = lan865x_remove,
> +};
> +module_spi_driver(lan865x_driver);
> +
> +MODULE_DESCRIPTION(DRV_NAME " 10Base-T1S MACPHY Ethernet Driver");
> +MODULE_AUTHOR("Parthiban Veerasooran <parthiban.veerasooran@...rochip.com>");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("spi:" DRV_NAME);
You should not need MODULE_ALIAS() in normal cases. If you need it,
usually it means your device ID table is wrong.
Best regards,
Krzysztof
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