netdev - Re: [PATCH net-next v8 11/13] net: phy: add driver for built-in 2.5G ethernet PHY on MT7988

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Date: Sat, 22 Jun 2024 19:57:44 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Sky Huang <SkyLake.Huang@...iatek.com>
Cc: Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Daniel Golle <daniel@...rotopia.org>,
	Qingfang Deng <dqfext@...il.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	Steven Liu <Steven.Liu@...iatek.com>
Subject: Re: [PATCH net-next v8 11/13] net: phy: add driver for built-in 2.5G
 ethernet PHY on MT7988

On Fri, Jun 21, 2024 at 08:20:43PM +0800, Sky Huang wrote:
> From: "SkyLake.Huang" <skylake.huang@...iatek.com>
> 
> Add support for internal 2.5Gphy on MT7988. This driver will load
> necessary firmware, add appropriate time delay and figure out LED.
> Also, certain control registers will be set to fix link-up issues.
> 
> Signed-off-by: SkyLake.Huang <skylake.huang@...iatek.com>
> ---
> Changes in v8:
> - Replace tr_modify with mtk_tr_modify and fix alignment.
> - Remove unnecessary outer parens of "supported_triggers" var.
> - Align declarations in mtk_2p5gephy_driver[]. At first, some of them are
> ".foo<tab>= method_foo", and others are ".bar<space>= method_bar".
> Use space instead for all of them here.
> ---
>  MAINTAINERS                          |   1 +
>  drivers/net/phy/mediatek/Kconfig     |  11 +
>  drivers/net/phy/mediatek/Makefile    |   1 +
>  drivers/net/phy/mediatek/mtk-2p5ge.c | 435 +++++++++++++++++++++++++++
>  4 files changed, 448 insertions(+)
>  create mode 100644 drivers/net/phy/mediatek/mtk-2p5ge.c
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index e58e05c..fe380f2 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -13793,6 +13793,7 @@ M:	Qingfang Deng <dqfext@...il.com>
>  M:	SkyLake Huang <SkyLake.Huang@...iatek.com>
>  L:	netdev@...r.kernel.org
>  S:	Maintained
> +F:	drivers/net/phy/mediatek/mtk-2p5ge.c
>  F:	drivers/net/phy/mediatek/mtk-ge-soc.c
>  F:	drivers/net/phy/mediatek/mtk-phy-lib.c
>  F:	drivers/net/phy/mediatek/mtk-ge.c
> diff --git a/drivers/net/phy/mediatek/Kconfig b/drivers/net/phy/mediatek/Kconfig
> index 448bc20..1490352 100644
> --- a/drivers/net/phy/mediatek/Kconfig
> +++ b/drivers/net/phy/mediatek/Kconfig
> @@ -25,3 +25,14 @@ config MEDIATEK_GE_SOC_PHY
>  	  the MT7981 and MT7988 SoCs. These PHYs need calibration data
>  	  present in the SoCs efuse and will dynamically calibrate VCM
>  	  (common-mode voltage) during startup.
> +
> +config MEDIATEK_2P5GE_PHY
> +	tristate "MediaTek 2.5Gb Ethernet PHYs"
> +	depends on (ARM64 && ARCH_MEDIATEK) || COMPILE_TEST
> +	select MTK_NET_PHYLIB
> +	help
> +	  Supports MediaTek SoC built-in 2.5Gb Ethernet PHYs.
> +
> +	  This will load necessary firmware and add appropriate time delay.
> +	  Accelerate this procedure through internal pbus instead of MDIO
> +	  bus. Certain link-up issues will also be fixed here.
> diff --git a/drivers/net/phy/mediatek/Makefile b/drivers/net/phy/mediatek/Makefile
> index 814879d..c6db8ab 100644
> --- a/drivers/net/phy/mediatek/Makefile
> +++ b/drivers/net/phy/mediatek/Makefile
> @@ -2,3 +2,4 @@
>  obj-$(CONFIG_MTK_NET_PHYLIB)		+= mtk-phy-lib.o
>  obj-$(CONFIG_MEDIATEK_GE_PHY)		+= mtk-ge.o
>  obj-$(CONFIG_MEDIATEK_GE_SOC_PHY)	+= mtk-ge-soc.o
> +obj-$(CONFIG_MEDIATEK_2P5GE_PHY)	+= mtk-2p5ge.o
> diff --git a/drivers/net/phy/mediatek/mtk-2p5ge.c b/drivers/net/phy/mediatek/mtk-2p5ge.c
> new file mode 100644
> index 0000000..f3efcc4
> --- /dev/null
> +++ b/drivers/net/phy/mediatek/mtk-2p5ge.c
> @@ -0,0 +1,435 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +#include <linux/bitfield.h>
> +#include <linux/firmware.h>
> +#include <linux/module.h>
> +#include <linux/nvmem-consumer.h>
> +#include <linux/of_address.h>
> +#include <linux/of_platform.h>
> +#include <linux/pinctrl/consumer.h>
> +#include <linux/phy.h>
> +#include <linux/pm_domain.h>
> +#include <linux/pm_runtime.h>
> +
> +#include "mtk.h"
> +
> +#define MTK_2P5GPHY_ID_MT7988	(0x00339c11)
> +
> +#define MT7988_2P5GE_PMB "mediatek/mt7988/i2p5ge-phy-pmb.bin"

You probably want a MODULE_FIRMWARE() so the firmware gets placed into
the initrd.

> +#define BASE100T_STATUS_EXTEND		(0x10)
> +#define BASE1000T_STATUS_EXTEND		(0x11)
> +#define EXTEND_CTRL_AND_STATUS		(0x16)

These don't appear to be used.

      Andrew