netdev - Re: [PATCH v3 5/7] net: stmmac: Add glue layer for StarFive JH7110 SoCs

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Date:   Mon, 9 Jan 2023 09:13:27 +0800
From:   yanhong wang <yanhong.wang@...rfivetech.com>
To:     <Arun.Ramadoss@...rochip.com>, <netdev@...r.kernel.org>,
        <linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>
CC:     <andrew@...n.ch>, <robh+dt@...nel.org>, <pgwipeout@...il.com>,
        <kernel@...il.dk>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <edumazet@...gle.com>, <richardcochran@...il.com>,
        <krzysztof.kozlowski+dt@...aro.org>, <davem@...emloft.net>,
        <hkallweit1@...il.com>
Subject: Re: [PATCH v3 5/7] net: stmmac: Add glue layer for StarFive JH7110
 SoCs



On 2023/1/8 19:11, Arun.Ramadoss@...rochip.com wrote:
> Hi Yanhong,
> 
> On Fri, 2023-01-06 at 10:59 +0800, Yanhong Wang wrote:
>> This adds StarFive dwmac driver support on the StarFive JH7110 SoCs.
>> 
>> Signed-off-by: Yanhong Wang <yanhong.wang@...rfivetech.com>
>> Co-developed-by: Emil Renner Berthing <kernel@...il.dk>
>> Signed-off-by: Emil Renner Berthing <kernel@...il.dk>
>> ---
>>  MAINTAINERS                                   |   1 +
>>  drivers/net/ethernet/stmicro/stmmac/Kconfig   |  12 ++
>>  drivers/net/ethernet/stmicro/stmmac/Makefile  |   1 +
>>  .../stmicro/stmmac/dwmac-starfive-plat.c      | 123
>> ++++++++++++++++++
>>  4 files changed, 137 insertions(+)
>>  create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-
>> starfive-plat.c
>> 
>> 
>> 
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive-
>> plat.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive-plat.c
>> new file mode 100644
>> index 000000000000..910095b10fe4
>> --- /dev/null
>> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive-plat.c
>> @@ -0,0 +1,123 @@
>> +// SPDX-License-Identifier: GPL-2.0+
>> +/*
>> + * StarFive DWMAC platform driver
>> + *
>> + * Copyright(C) 2022 StarFive Technology Co., Ltd.
>> + *
>> + */
>> +
>> +#include <linux/of_device.h>
> 
> Blank line between header with <  > and " "
> 

Thanks, i will fix.

>> +#include "stmmac_platform.h"
>> +
>> +struct starfive_dwmac {
>> +	struct device *dev;
>> +	struct clk *clk_tx;
>> +	struct clk *clk_gtx;
>> +	struct clk *clk_gtxc;
>> +};
>> +
>> +static void starfive_eth_plat_fix_mac_speed(void *priv, unsigned int
>> speed)
>> +{
>> +	struct starfive_dwmac *dwmac = priv;
>> +	unsigned long rate;
>> +	int err;
>> +
>> +	switch (speed) {
>> +	case SPEED_1000:
>> +		rate = 125000000;
>> +		break;
>> +	case SPEED_100:
>> +		rate = 25000000;
>> +		break;
>> +	case SPEED_10:
>> +		rate = 2500000;
>> +		break;
>> +	default:
>> +		dev_err(dwmac->dev, "invalid speed %u\n", speed);
>> +		return;
> 
> Do we need to return value, since it is invalid speed. But the return
> value of function is void.
> 

I will fix.

>> +	}
>> +
>> +	err = clk_set_rate(dwmac->clk_gtx, rate);
>> +	if (err)
>> +		dev_err(dwmac->dev, "failed to set tx rate %lu\n",
>> rate);
>> +}
>> +
>> +static int starfive_eth_plat_probe(struct platform_device *pdev)
>> +{
>> +	struct plat_stmmacenet_data *plat_dat;
>> +	struct stmmac_resources stmmac_res;
>> +	struct starfive_dwmac *dwmac;
>> +	int (*syscon_init)(struct device *dev);
> 
> Reverse christmas tree.
> 

I will delete the unused variable syscon_init.

>> +	int err;
>> +
>> +	err = stmmac_get_platform_resources(pdev, &stmmac_res);
>> +	if (err)
>> +		return err;
>> +
>> +	plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
>> +	if (IS_ERR(plat_dat)) {
>> +		dev_err(&pdev->dev, "dt configuration failed\n");
>> +		return PTR_ERR(plat_dat);
>> +	}
>> +
>> +	dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
>> +	if (!dwmac)
>> +		return -ENOMEM;
>> +
>> +	syscon_init = of_device_get_match_data(&pdev->dev);
>> +	if (syscon_init) {
>> +		err = syscon_init(&pdev->dev);
>> +		if (err)
>> +			return err;
>> +	}
>> +
>> +	dwmac->clk_tx = devm_clk_get_enabled(&pdev->dev, "tx");
>> +	if (IS_ERR(dwmac->clk_tx))
>> +		return dev_err_probe(&pdev->dev, PTR_ERR(dwmac-
>> >clk_tx),
>> +						"error getting tx
>> clock\n");
>> +
>> +	dwmac->clk_gtx = devm_clk_get_enabled(&pdev->dev, "gtx");
>> +	if (IS_ERR(dwmac->clk_gtx))
>> +		return dev_err_probe(&pdev->dev, PTR_ERR(dwmac-
>> >clk_gtx),
>> +						"error getting gtx
>> clock\n");
>> +
>> +	dwmac->clk_gtxc = devm_clk_get_enabled(&pdev->dev, "gtxc");
>> +	if (IS_ERR(dwmac->clk_gtxc))
>> +		return dev_err_probe(&pdev->dev, PTR_ERR(dwmac-
>> >clk_gtxc),
>> +						"error getting gtxc
>> clock\n");
>> +
>> +	dwmac->dev = &pdev->dev;
>> +	plat_dat->fix_mac_speed = starfive_eth_plat_fix_mac_speed;
>> +	plat_dat->init = NULL;
>> +	plat_dat->bsp_priv = dwmac;
>> +	plat_dat->dma_cfg->dche = true;
>> +
>> +	err = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
>> +	if (err) {
>> +		stmmac_remove_config_dt(pdev, plat_dat);
>> +		return err;
>> +	}
>> +
>> +	return 0;
>> +}
>> +