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net: pcs: add driver for MediaTek SGMII PCS

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The SGMII core found in several MediaTek SoCs is identical to what can
also be found in MediaTek's MT7531 Ethernet switch IC.
As this has not always been clear, both drivers developed different
implementations to deal with the PCS.
Recently Alexander Couzens pointed out this fact which lead to the
development of this shared driver.

Add a dedicated driver, mostly by copying the code now found in the
Ethernet driver. The now redundant code will be removed by a follow-up
commit.

Suggested-by: Alexander Couzens <lynxis@fe80.eu>
Suggested-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Tested-by: Frank Wunderlich <frank-w@public-files.de>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Daniel Golle
2023-03-19 12:57:50 +00:00
committed by Jakub Kicinski
parent 3fbe4d8c0e
commit 4765a9722e
5 changed files with 334 additions and 0 deletions
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13
include/linux/pcs/pcs-mtk-lynxi.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_PCS_MTK_LYNXI_H
#define __LINUX_PCS_MTK_LYNXI_H
#include <linux/phylink.h>
#include <linux/regmap.h>
#define MTK_SGMII_FLAG_PN_SWAP BIT(0)
struct phylink_pcs *mtk_pcs_lynxi_create(struct device *dev,
struct regmap *regmap,
u32 ana_rgc3, u32 flags);
void mtk_pcs_lynxi_destroy(struct phylink_pcs *pcs);
#endif