netdev - Re: [PATCH v15 mfd 2/9] net: mdio: mscc-miim: add ability to be used in a non-mmio configuration

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Message-ID: <CAHp75Ve0i4T9vu0Y4BpOX=MWMyV=jognMgwow_Tk4inW=ZyvLQ@mail.gmail.com>
Date:   Wed, 3 Aug 2022 13:31:35 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Colin Foster <colin.foster@...advantage.com>
Cc:     linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Terry Bowman <terry.bowman@....com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Wolfram Sang <wsa@...nel.org>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        Steen Hegelund <Steen.Hegelund@...rochip.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Russell King <linux@...linux.org.uk>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Lee Jones <lee.jones@...aro.org>, katie.morris@...advantage.com
Subject: Re: [PATCH v15 mfd 2/9] net: mdio: mscc-miim: add ability to be used
 in a non-mmio configuration

On Wed, Aug 3, 2022 at 7:47 AM Colin Foster
<colin.foster@...advantage.com> wrote:
>
> There are a few Ocelot chips that contain the logic for this bus, but are
> controlled externally. Specifically the VSC7511, 7512, 7513, and 7514. In
> the externally controlled configurations these registers are not
> memory-mapped.
>
> Add support for these non-memory-mapped configurations.

FWIW,
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

> Signed-off-by: Colin Foster <colin.foster@...advantage.com>
> Reviewed-by: Vladimir Oltean <vladimir.oltean@....com>
> Acked-by: Jakub Kicinski <kuba@...nel.org>
> ---
>
> (No changes since v14)
>
> v14
>     * Add Reviewed and Acked tags
>
> ---
>  drivers/net/mdio/mdio-mscc-miim.c | 42 +++++++++----------------------
>  1 file changed, 12 insertions(+), 30 deletions(-)
>
> diff --git a/drivers/net/mdio/mdio-mscc-miim.c b/drivers/net/mdio/mdio-mscc-miim.c
> index 08541007b18a..51f68daac152 100644
> --- a/drivers/net/mdio/mdio-mscc-miim.c
> +++ b/drivers/net/mdio/mdio-mscc-miim.c
> @@ -12,6 +12,7 @@
>  #include <linux/iopoll.h>
>  #include <linux/kernel.h>
>  #include <linux/mdio/mdio-mscc-miim.h>
> +#include <linux/mfd/ocelot.h>
>  #include <linux/module.h>
>  #include <linux/of_mdio.h>
>  #include <linux/phy.h>
> @@ -270,44 +271,25 @@ static int mscc_miim_clk_set(struct mii_bus *bus)
>
>  static int mscc_miim_probe(struct platform_device *pdev)
>  {
> -       struct regmap *mii_regmap, *phy_regmap = NULL;
>         struct device_node *np = pdev->dev.of_node;
> +       struct regmap *mii_regmap, *phy_regmap;
>         struct device *dev = &pdev->dev;
> -       void __iomem *regs, *phy_regs;
>         struct mscc_miim_dev *miim;
> -       struct resource *res;
>         struct mii_bus *bus;
>         int ret;
>
> -       regs = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
> -       if (IS_ERR(regs)) {
> -               dev_err(dev, "Unable to map MIIM registers\n");
> -               return PTR_ERR(regs);
> -       }
> -
> -       mii_regmap = devm_regmap_init_mmio(dev, regs, &mscc_miim_regmap_config);
> -
> -       if (IS_ERR(mii_regmap)) {
> -               dev_err(dev, "Unable to create MIIM regmap\n");
> -               return PTR_ERR(mii_regmap);
> -       }
> +       mii_regmap = ocelot_regmap_from_resource(pdev, 0,
> +                                                &mscc_miim_regmap_config);
> +       if (IS_ERR(mii_regmap))
> +               return dev_err_probe(dev, PTR_ERR(mii_regmap),
> +                                    "Unable to create MIIM regmap\n");
>
>         /* This resource is optional */
> -       res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> -       if (res) {
> -               phy_regs = devm_ioremap_resource(dev, res);
> -               if (IS_ERR(phy_regs)) {
> -                       dev_err(dev, "Unable to map internal phy registers\n");
> -                       return PTR_ERR(phy_regs);
> -               }
> -
> -               phy_regmap = devm_regmap_init_mmio(dev, phy_regs,
> -                                                  &mscc_miim_phy_regmap_config);
> -               if (IS_ERR(phy_regmap)) {
> -                       dev_err(dev, "Unable to create phy register regmap\n");
> -                       return PTR_ERR(phy_regmap);
> -               }
> -       }
> +       phy_regmap = ocelot_regmap_from_resource_optional(pdev, 1,
> +                                                &mscc_miim_phy_regmap_config);
> +       if (IS_ERR(phy_regmap))
> +               return dev_err_probe(dev, PTR_ERR(phy_regmap),
> +                                    "Unable to create phy register regmap\n");
>
>         ret = mscc_miim_setup(dev, &bus, "mscc_miim", mii_regmap, 0);
>         if (ret < 0) {
> --
> 2.25.1
>


-- 
With Best Regards,
Andy Shevchenko