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

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Date:   Sun, 8 Jan 2023 11:11:01 +0000
From:   <Arun.Ramadoss@...rochip.com>
To:     <netdev@...r.kernel.org>, <linux-riscv@...ts.infradead.org>,
        <yanhong.wang@...rfivetech.com>, <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

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 " "

> +#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.

> +	}
> +
> +	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.

> +	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;
> +}
> +