netdev - Re: [PATCH 4/5] net: stmmac: Add glue layer for Loongson-1 SoC

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Message-ID: <CAJhJPsXOUOB_0kWcKC0Sy8F9qPbkU+NfVFRz-Hkk8eS-YuUS7w@mail.gmail.com>
Date: Mon, 14 Aug 2023 18:50:32 +0800
From: Keguang Zhang <keguang.zhang@...il.com>
To: Simon Horman <horms@...nel.org>
Cc: netdev@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Lee Jones <lee@...nel.org>, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>, Giuseppe Cavallaro <peppe.cavallaro@...com>, 
	Alexandre Torgue <alexandre.torgue@...s.st.com>, Jose Abreu <joabreu@...opsys.com>, 
	Serge Semin <Sergey.Semin@...kalelectronics.ru>
Subject: Re: [PATCH 4/5] net: stmmac: Add glue layer for Loongson-1 SoC

On Mon, Aug 14, 2023 at 2:24 AM Simon Horman <horms@...nel.org> wrote:
>
> On Sat, Aug 12, 2023 at 11:11:34PM +0800, Keguang Zhang wrote:
> > This glue driver is created based on the arch-code
> > implemented earlier with the platform-specific settings.
> >
> > Use syscon for SYSCON register access.
> >
> > Partialy based on the previous work by Serge Semin.
> >
> > Signed-off-by: Keguang Zhang <keguang.zhang@...il.com>
>
> ...
>
> Hi Keguang Zhang,
>
> some minor feedback from my side.
>
> > diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson1.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson1.c
>
> ...
>
> > +const struct reg_field ls1b_dwmac_syscon_regfields[] = {
> > +     [GMAC1_USE_UART1]       = REG_FIELD(LS1X_SYSCON0, 4, 4),
> > +     [GMAC1_USE_UART0]       = REG_FIELD(LS1X_SYSCON0, 3, 3),
> > +     [GMAC1_SHUT]            = REG_FIELD(LS1X_SYSCON1, 13, 13),
> > +     [GMAC0_SHUT]            = REG_FIELD(LS1X_SYSCON1, 12, 12),
> > +     [GMAC1_USE_TXCLK]       = REG_FIELD(LS1X_SYSCON1, 3, 3),
> > +     [GMAC0_USE_TXCLK]       = REG_FIELD(LS1X_SYSCON1, 2, 2),
> > +     [GMAC1_USE_PWM23]       = REG_FIELD(LS1X_SYSCON1, 1, 1),
> > +     [GMAC0_USE_PWM01]       = REG_FIELD(LS1X_SYSCON1, 0, 0)
> > +};
>
> nit: Perhaps ls1b_dwmac_syscon_regfields should be static.
>
> > +
> > +const struct reg_field ls1c_dwmac_syscon_regfields[] = {
> > +     [GMAC_SHUT]             = REG_FIELD(LS1X_SYSCON0, 6, 6),
> > +     [PHY_INTF_SELI]         = REG_FIELD(LS1X_SYSCON1, 28, 30)
> > +};
>
> Likewise, perhaps ls1c_dwmac_syscon_regfields should be static.
>
Will do.
Thanks!
> ...
>
> > +static const struct of_device_id ls1x_dwmac_syscon_match[] = {
> > +     { .compatible = "loongson,ls1b-syscon", .data = &ls1b_dwmac_syscon },
> > +     { .compatible = "loongson,ls1c-syscon", .data = &ls1c_dwmac_syscon },
> > +     { }
> > +};o
>
> I am seeing a warning about ls1x_dwmac_syscon_match being unused.
> I think this is due to CONFIG_OF being unset.

Will fix these warnings.
>
> > +
> > +static int ls1x_dwmac_probe(struct platform_device *pdev)
> > +{
> > +     struct plat_stmmacenet_data *plat_dat;
> > +     struct stmmac_resources stmmac_res;
> > +     struct device_node *syscon_np;
> > +     const struct of_device_id *match;
> > +     struct regmap *regmap;
> > +     struct ls1x_dwmac *dwmac;
> > +     const struct ls1x_dwmac_syscon *syscon;
> > +     size_t size;
> > +     int ret;
> > +
> > +     ret = stmmac_get_platform_resources(pdev, &stmmac_res);
> > +     if (ret)
> > +             return ret;
> > +
> > +     /* Probe syscon */
> > +     syscon_np = of_parse_phandle(pdev->dev.of_node, "syscon", 0);
> > +     if (!syscon_np)
> > +             return -ENODEV;
> > +
> > +     match = of_match_node(ls1x_dwmac_syscon_match, syscon_np);
> > +     if (!match) {
> > +             of_node_put(syscon_np);
> > +             return -EINVAL;
> > +     }
> > +     syscon = (const struct ls1x_dwmac_syscon *)match->data;
> > +
> > +     regmap = syscon_node_to_regmap(syscon_np);
> > +     of_node_put(syscon_np);
> > +     if (IS_ERR(regmap)) {
> > +             ret = PTR_ERR(regmap);
> > +             dev_err(&pdev->dev, "Unable to map syscon: %d\n", ret);
> > +             return ret;
> > +     }
> > +
> > +     size = syscon->nr_reg_fields * sizeof(struct regmap_field *);
> > +     dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac) + size, GFP_KERNEL);
> > +     if (!dwmac)
> > +             return -ENOMEM;
> > +
> > +     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);
> > +     }
> > +
> > +     plat_dat->bsp_priv = dwmac;
> > +     plat_dat->init = ls1x_dwmac_init;
> > +     dwmac->dev = &pdev->dev;
> > +     dwmac->plat_dat = plat_dat;
> > +     dwmac->syscon = syscon;
> > +     dwmac->regmap = regmap;
> > +
> > +     ret = stmmac_pltfr_probe(pdev, plat_dat, &stmmac_res);
> > +     if (ret)
> > +             goto err_remove_config_dt;
> > +
> > +     return 0;
> > +
> > +err_remove_config_dt:
> > +     if (pdev->dev.of_node)
> > +             stmmac_remove_config_dt(pdev, plat_dat);
> > +
> > +     return ret;
> > +}
>
> ...



-- 
Best regards,

Keguang Zhang