Re: [RFC v7 net-next 10/13] mfd: ocelot: add support for the vsc7512 chip via spi

Vladimir Oltean
2022-03-08T14:37:56Z

On Sun, Mar 06, 2022 at 06:12:05PM -0800, Colin Foster wrote:
> The VSC7512 is a networking chip that contains several peripherals. Many of
> these peripherals are currently supported by the VSC7513 and VSC7514 chips,
> but those run on an internal CPU. The VSC7512 lacks this CPU, and must be
> controlled externally.
>
> Utilize the existing drivers by referencing the chip as an MFD. Add support
> for the two MDIO buses, the internal phys, pinctrl, serial GPIO, and HSIO.
>
> Signed-off-by: Colin Foster <colin.foster@in-advantage.com>
> ---
> +#define VSC7512_MIIM0_RES_START 0x7107009c
> +#define VSC7512_MIIM0_RES_SIZE 0x24
> +
> +#define VSC7512_MIIM1_RES_START 0x710700c0
> +#define VSC7512_MIIM1_RES_SIZE 0x24
> +
> +#define VSC7512_PHY_RES_START 0x710700f0
> +#define VSC7512_PHY_RES_SIZE 0x4
> +
> +#define VSC7512_HSIO_RES_START 0x710d0000
> +#define VSC7512_HSIO_RES_SIZE 0x10000
> +
> +#define VSC7512_GPIO_RES_START 0x71070034
> +#define VSC7512_GPIO_RES_SIZE 0x6c
> +
> +#define VSC7512_SIO_RES_START 0x710700f8
> +#define VSC7512_SIO_RES_SIZE 0x100
> +
> +static const struct resource vsc7512_gcb_resource =
> + DEFINE_RES_REG_NAMED(VSC7512_GCB_RES_START, VSC7512_GCB_RES_SIZE,
> + "devcpu_gcb_chip_regs");
> +static const struct resource vsc7512_miim0_resources[] = {
> + DEFINE_RES_REG_NAMED(VSC7512_MIIM0_RES_START, VSC7512_MIIM0_RES_SIZE,
> + "gcb_miim0"),
> + DEFINE_RES_REG_NAMED(VSC7512_PHY_RES_START, VSC7512_PHY_RES_SIZE,
> + "gcb_phy"),
> +};
> +
> +static const struct resource vsc7512_miim1_resources[] = {
> + DEFINE_RES_REG_NAMED(VSC7512_MIIM1_RES_START, VSC7512_MIIM1_RES_SIZE,
> + "gcb_miim1"),
> +};
> +
> +static const struct resource vsc7512_hsio_resources[] = {
> + DEFINE_RES_REG_NAMED(VSC7512_HSIO_RES_START, VSC7512_HSIO_RES_SIZE,
> + "hsio"),
> +};
> +
> +static const struct resource vsc7512_pinctrl_resources[] = {
> + DEFINE_RES_REG_NAMED(VSC7512_GPIO_RES_START, VSC7512_GPIO_RES_SIZE,
> + "gcb_gpio"),
> +};
> +
> +static const struct resource vsc7512_sgpio_resources[] = {
> + DEFINE_RES_REG_NAMED(VSC7512_SIO_RES_START, VSC7512_SIO_RES_SIZE,
> + "gcb_sio"),
> +};
> +
> +static const struct mfd_cell vsc7512_devs[] = {
> + {
> + .name = "ocelot-pinctrl",
> + .of_compatible = "mscc,ocelot-pinctrl",
> + .num_resources = ARRAY_SIZE(vsc7512_pinctrl_resources),
> + .resources = vsc7512_pinctrl_resources,
> + }, {
> + .name = "ocelot-sgpio",
> + .of_compatible = "mscc,ocelot-sgpio",
> + .num_resources = ARRAY_SIZE(vsc7512_sgpio_resources),
> + .resources = vsc7512_sgpio_resources,
> + }, {
> + .name = "ocelot-miim0",
> + .of_compatible = "mscc,ocelot-miim",
> + .num_resources = ARRAY_SIZE(vsc7512_miim0_resources),
> + .resources = vsc7512_miim0_resources,
> + }, {
> + .name = "ocelot-miim1",
> + .of_compatible = "mscc,ocelot-miim",
> + .num_resources = ARRAY_SIZE(vsc7512_miim1_resources),
> + .resources = vsc7512_miim1_resources,

I'm looking at mfd_match_of_node_to_dev() and I don't really understand
how the first MDIO bus matches the first mfd_cell's resources, and the
second MDIO bus the second mfd_cell? By order of definition?

> + }, {
> + .name = "ocelot-serdes",
> + .of_compatible = "mscc,vsc7514-serdes",
> + .num_resources = ARRAY_SIZE(vsc7512_hsio_resources),
> + .resources = vsc7512_hsio_resources,
> + },
> +};
> +
> +int ocelot_core_init(struct ocelot_core *core)
> +{
> + struct device *dev = core->dev;
> + int ret;
> +
> + dev_set_drvdata(dev, core);
> +
> + core->gcb_regmap = ocelot_devm_regmap_init(core, dev,
> + &vsc7512_gcb_resource);
> + if (IS_ERR(core->gcb_regmap))
> + return -ENOMEM;
> +
> + ret = ocelot_reset(core);
> + if (ret) {
> + dev_err(dev, "Failed to reset device: %d\n", ret);
> + return ret;
> + }
> +
> + /*
> + * A chip reset will clear the SPI configuration, so it needs to be done
> + * again before we can access any registers
> + */
> + ret = ocelot_spi_initialize(core);
> + if (ret) {
> + dev_err(dev, "Failed to initialize SPI interface: %d\n", ret);
> + return ret;
> + }
> +
> + ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO, vsc7512_devs,
> + ARRAY_SIZE(vsc7512_devs), NULL, 0, NULL);
> + if (ret) {
> + dev_err(dev, "Failed to add sub-devices: %d\n", ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(ocelot_core_init);
> --
> 2.25.1
>