裕泰微YT8521SH PHY芯片在uboot下的代码适配（二）

裕泰微YT8521SH PHY芯片在uboot下的代码适配（一）

本文主要是介绍uboot下的适配代码来源和具体修改。

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代码搜索

https://github.com/starfive-tech/u-boot/blob/JH7110_VisionFive2_devel/drivers/net/phy/motorcomm.c#L307
星火科技的PHY用的裕泰微，所以基础的uboot demo可以用他们家的补丁。但是具体配置都不是很对，还是看我的代码为准。
kernel下的PHY驱动
https://github.com/ROCm/ROCK-Kernel-Driver/blob/cc2d8659760f7729b3bed35dc7870eecc5499fd4/drivers/net/phy/motorcomm.c
https://github.com/rockchip-linux/kernel/blob/9ed2be4b9c001ca8006cb4c72928c09927c44f89/drivers/net/phy/motorcomm.c#L2
https://github.com/cnxsoft/YT8521S/tree/main
这个写的很好，应该是正式的kernel 驱动补丁。
https://patchwork.kernel.org/project/netdevbpf/patch/20220620023621.1852-1-Frank.Sae@motor-comm.com/

移植步骤

在 …/u-boot/drivers/net/phy 目录下添加motorcomm.c
修改…/ u-boot/drivers/net/phy 目录下的 Kconfig 文件
添加

config PHY_YT
     bool “YT Ethernet PHYs support”
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修改…/ u-boot /drivers/net/phy 目录下的 Makefile
添加

obj-$(CONFIG_PHY_YT)  += motorcomm.o
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修改…/ u-boot /drivers/net/phy 目录下的 phy.c
添加

#ifdef CONFIG_PHY_YT
     phy_yutai_init();
#endif
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./include/configs/S1020.h中添加CONFIG_PHY_YT=y，打开CONFIG_RGMII

在./board/中
这里需要同步修改，在uboot下使用哪一个网口进行传输就define哪一个BASE_ADDR

phy_addr的修改需要对照硬件原理图进行。

如图的话就是3。

具体代码

motorcomm.c如下

// SPDX-License-Identifier: GPL-2.0+
/*
 * RealTek PHY drivers
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 *
 * Copyright 2010-2011 Freescale Semiconductor, Inc.
 * author Andy Fleming
 *
 */

#include <config.h>
#include <common.h>
#include <phy.h>
#include <bitfield.h>

#define REG_PHY_SPEC_STATUS	0x11
#define REG_DEBUG_ADDR_OFFSET	0x1e
#define REG_DEBUG_DATA		0x1f
#define EXTREG_SLEEP_CONTROL	0x27
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