Re: [PATCH 2/4] MIPS: pci: Add driver for MT7621 PCIe controller
From: Bjorn Helgaas
Date: Fri Jun 04 2021 - 15:49:14 EST
On Sat, May 15, 2021 at 02:40:53PM +0200, Sergio Paracuellos wrote:
> This patch adds a driver for the PCIe controller of MT7621 SoC.
If you put this in drivers/pci/, update the subject/commit log like
this:
PCI: mt7621: Add MediaTek MT7621 PCIe host controller driver
Add driver for the PCIe controller of the MT7621 SoC.
> Signed-off-by: Sergio Paracuellos <sergio.paracuellos@xxxxxxxxx>
> ---
> arch/mips/pci/Makefile | 1 +
> arch/mips/pci/pci-mt7621.c | 624 +++++++++++++++++++++++++++++++++++++
> arch/mips/ralink/Kconfig | 9 +-
> 3 files changed, 633 insertions(+), 1 deletion(-)
> create mode 100644 arch/mips/pci/pci-mt7621.c
I'd suggest a single commit that basically does a "git mv" from
drivers/staging/mt7621-pci to drivers/pci/controller/, with zero
changes to the driver itself.
> diff --git a/arch/mips/pci/Makefile b/arch/mips/pci/Makefile
> index f3eecc065e5c..178c550739c4 100644
> --- a/arch/mips/pci/Makefile
> +++ b/arch/mips/pci/Makefile
> @@ -24,6 +24,7 @@ obj-$(CONFIG_PCI_AR2315) += pci-ar2315.o
> obj-$(CONFIG_SOC_AR71XX) += pci-ar71xx.o
> obj-$(CONFIG_PCI_AR724X) += pci-ar724x.o
> obj-$(CONFIG_PCI_XTALK_BRIDGE) += pci-xtalk-bridge.o
> +obj-$(CONFIG_PCI_MT7621) += pci-mt7621.o
> #
> # These are still pretty much in the old state, watch, go blind.
> #
> diff --git a/arch/mips/pci/pci-mt7621.c b/arch/mips/pci/pci-mt7621.c
> new file mode 100644
> index 000000000000..fe1945819d25
> --- /dev/null
> +++ b/arch/mips/pci/pci-mt7621.c
> @@ -0,0 +1,624 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * BRIEF MODULE DESCRIPTION
> + * PCI init for Ralink RT2880 solution
> + *
> + * Copyright 2007 Ralink Inc. (bruce_chang@xxxxxxxxxxxxxxxxx)
> + *
> + * May 2007 Bruce Chang
> + * Initial Release
> + *
> + * May 2009 Bruce Chang
> + * support RT2880/RT3883 PCIe
> + *
> + * May 2011 Bruce Chang
> + * support RT6855/MT7620 PCIe
> + */
> +
> +#include <linux/bitops.h>
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/of_pci.h>
> +#include <linux/of_platform.h>
> +#include <linux/pci.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/reset.h>
> +#include <linux/sys_soc.h>
> +
> +/* MediaTek specific configuration registers */
> +#define PCIE_FTS_NUM 0x70c
> +#define PCIE_FTS_NUM_MASK GENMASK(15, 8)
> +#define PCIE_FTS_NUM_L0(x) (((x) & 0xff) << 8)
> +
> +/* Host-PCI bridge registers */
> +#define RALINK_PCI_PCICFG_ADDR 0x0000
> +#define RALINK_PCI_PCIMSK_ADDR 0x000C
> +#define RALINK_PCI_CONFIG_ADDR 0x0020
> +#define RALINK_PCI_CONFIG_DATA 0x0024
> +#define RALINK_PCI_MEMBASE 0x0028
> +#define RALINK_PCI_IOBASE 0x002C
> +
> +/* PCIe RC control registers */
> +#define MT7621_PCIE_OFFSET 0x2000
> +#define MT7621_NEXT_PORT 0x1000
> +
> +#define RALINK_PCI_BAR0SETUP_ADDR 0x0010
> +#define RALINK_PCI_ID 0x0030
> +#define RALINK_PCI_CLASS 0x0034
> +#define RALINK_PCI_SUBID 0x0038
> +#define RALINK_PCI_STATUS 0x0050
> +
> +/* Some definition values */
> +#define PCIE_REVISION_ID BIT(0)
> +#define PCIE_CLASS_CODE (0x60400 << 8)
> +#define PCIE_BAR_MAP_MAX GENMASK(30, 16)
> +#define PCIE_BAR_ENABLE BIT(0)
> +#define PCIE_PORT_INT_EN(x) BIT(20 + (x))
> +#define PCIE_PORT_LINKUP BIT(0)
> +
> +#define PERST_DELAY_MS 100
> +
> +/**
> + * struct mt7621_pcie_port - PCIe port information
> + * @base: I/O mapped register base
> + * @list: port list
> + * @pcie: pointer to PCIe host info
> + * @clk: pointer to the port clock gate
> + * @phy: pointer to PHY control block
> + * @pcie_rst: pointer to port reset control
> + * @gpio_rst: gpio reset
> + * @slot: port slot
> + * @enabled: indicates if port is enabled
> + */
> +struct mt7621_pcie_port {
> + void __iomem *base;
> + struct list_head list;
> + struct mt7621_pcie *pcie;
> + struct clk *clk;
> + struct phy *phy;
> + struct reset_control *pcie_rst;
> + struct gpio_desc *gpio_rst;
> + u32 slot;
> + bool enabled;
> +};
> +
> +/**
> + * struct mt7621_pcie - PCIe host information
> + * @base: IO Mapped Register Base
> + * @io: IO resource
> + * @mem: pointer to non-prefetchable memory resource
> + * @dev: Pointer to PCIe device
> + * @io_map_base: virtual memory base address for io
> + * @ports: pointer to PCIe port information
> + * @resets_inverted: depends on chip revision
> + * reset lines are inverted.
> + */
> +struct mt7621_pcie {
> + void __iomem *base;
> + struct device *dev;
> + struct resource io;
> + struct resource *mem;
> + unsigned long io_map_base;
> + struct list_head ports;
> + bool resets_inverted;
> +};
> +
> +static inline u32 pcie_read(struct mt7621_pcie *pcie, u32 reg)
> +{
> + return readl(pcie->base + reg);
> +}
> +
> +static inline void pcie_write(struct mt7621_pcie *pcie, u32 val, u32 reg)
> +{
> + writel(val, pcie->base + reg);
> +}
> +
> +static inline void pcie_rmw(struct mt7621_pcie *pcie, u32 reg, u32 clr, u32 set)
> +{
> + u32 val = readl(pcie->base + reg);
> +
> + val &= ~clr;
> + val |= set;
> + writel(val, pcie->base + reg);
> +}
> +
> +static inline u32 pcie_port_read(struct mt7621_pcie_port *port, u32 reg)
> +{
> + return readl(port->base + reg);
> +}
> +
> +static inline void pcie_port_write(struct mt7621_pcie_port *port,
> + u32 val, u32 reg)
> +{
> + writel(val, port->base + reg);
> +}
> +
> +static inline u32 mt7621_pci_get_cfgaddr(unsigned int bus, unsigned int slot,
> + unsigned int func, unsigned int where)
> +{
> + return (((where & 0xF00) >> 8) << 24) | (bus << 16) | (slot << 11) |
> + (func << 8) | (where & 0xfc) | 0x80000000;
> +}
> +
> +static void __iomem *mt7621_pcie_map_bus(struct pci_bus *bus,
> + unsigned int devfn, int where)
> +{
> + struct mt7621_pcie *pcie = bus->sysdata;
> + u32 address = mt7621_pci_get_cfgaddr(bus->number, PCI_SLOT(devfn),
> + PCI_FUNC(devfn), where);
> +
> + writel(address, pcie->base + RALINK_PCI_CONFIG_ADDR);
> +
> + return pcie->base + RALINK_PCI_CONFIG_DATA + (where & 3);
> +}
> +
> +struct pci_ops mt7621_pci_ops = {
> + .map_bus = mt7621_pcie_map_bus,
> + .read = pci_generic_config_read,
> + .write = pci_generic_config_write,
> +};
> +
> +static u32 read_config(struct mt7621_pcie *pcie, unsigned int dev, u32 reg)
> +{
> + u32 address = mt7621_pci_get_cfgaddr(0, dev, 0, reg);
> +
> + pcie_write(pcie, address, RALINK_PCI_CONFIG_ADDR);
> + return pcie_read(pcie, RALINK_PCI_CONFIG_DATA);
> +}
> +
> +static void write_config(struct mt7621_pcie *pcie, unsigned int dev,
> + u32 reg, u32 val)
> +{
> + u32 address = mt7621_pci_get_cfgaddr(0, dev, 0, reg);
> +
> + pcie_write(pcie, address, RALINK_PCI_CONFIG_ADDR);
> + pcie_write(pcie, val, RALINK_PCI_CONFIG_DATA);
> +}
> +
> +static inline void mt7621_rst_gpio_pcie_assert(struct mt7621_pcie_port *port)
> +{
> + if (port->gpio_rst)
> + gpiod_set_value(port->gpio_rst, 1);
> +}
> +
> +static inline void mt7621_rst_gpio_pcie_deassert(struct mt7621_pcie_port *port)
> +{
> + if (port->gpio_rst)
> + gpiod_set_value(port->gpio_rst, 0);
> +}
> +
> +static inline bool mt7621_pcie_port_is_linkup(struct mt7621_pcie_port *port)
> +{
> + return (pcie_port_read(port, RALINK_PCI_STATUS) & PCIE_PORT_LINKUP) != 0;
> +}
> +
> +static inline void mt7621_control_assert(struct mt7621_pcie_port *port)
> +{
> + struct mt7621_pcie *pcie = port->pcie;
> +
> + if (pcie->resets_inverted)
> + reset_control_assert(port->pcie_rst);
> + else
> + reset_control_deassert(port->pcie_rst);
> +}
> +
> +static inline void mt7621_control_deassert(struct mt7621_pcie_port *port)
> +{
> + struct mt7621_pcie *pcie = port->pcie;
> +
> + if (pcie->resets_inverted)
> + reset_control_deassert(port->pcie_rst);
> + else
> + reset_control_assert(port->pcie_rst);
> +}
> +
> +static void setup_cm_memory_region(struct mt7621_pcie *pcie)
> +{
> + struct resource *mem_resource = pcie->mem;
> + struct device *dev = pcie->dev;
> + resource_size_t mask;
> +
> + if (mips_cps_numiocu(0)) {
> + /*
> + * FIXME: hardware doesn't accept mask values with 1s after
> + * 0s (e.g. 0xffef), so it would be great to warn if that's
> + * about to happen
> + */
> + mask = ~(mem_resource->end - mem_resource->start);
> +
> + write_gcr_reg1_base(mem_resource->start);
> + write_gcr_reg1_mask(mask | CM_GCR_REGn_MASK_CMTGT_IOCU0);
> + dev_info(dev, "PCI coherence region base: 0x%08llx, mask/settings: 0x%08llx\n",
> + (unsigned long long)read_gcr_reg1_base(),
> + (unsigned long long)read_gcr_reg1_mask());
> + }
> +}
> +
> +static int mt7621_pci_parse_request_of_pci_ranges(struct pci_host_bridge *host)
> +{
> + struct mt7621_pcie *pcie = pci_host_bridge_priv(host);
> + struct device *dev = pcie->dev;
> + struct device_node *node = dev->of_node;
> + struct of_pci_range_parser parser;
> + struct resource_entry *entry;
> + struct of_pci_range range;
> + LIST_HEAD(res);
> +
> + if (of_pci_range_parser_init(&parser, node)) {
> + dev_err(dev, "missing \"ranges\" property\n");
> + return -EINVAL;
> + }
> +
> + /*
> + * IO_SPACE_LIMIT for MIPS is 0xffff but this platform uses IO at
> + * upper address 0x001e160000. of_pci_range_to_resource does not work
> + * well for MIPS platforms that don't define PCI_IOBASE, so set the IO
> + * resource manually instead.
> + */
> + for_each_of_pci_range(&parser, &range) {
> + switch (range.flags & IORESOURCE_TYPE_BITS) {
> + case IORESOURCE_IO:
> + pcie->io_map_base =
> + (unsigned long)ioremap(range.cpu_addr,
> + range.size);
> + pcie->io.name = node->full_name;
> + pcie->io.flags = range.flags;
> + pcie->io.start = range.cpu_addr;
> + pcie->io.end = range.cpu_addr + range.size - 1;
> + pcie->io.parent = pcie->io.child = pcie->io.sibling = NULL;
> + set_io_port_base(pcie->io_map_base);
> + break;
> + }
> + }
> +
> + entry = resource_list_first_type(&host->windows, IORESOURCE_MEM);
> + if (!entry) {
> + dev_err(dev, "Cannot get memory resource");
> + return -EINVAL;
> + }
> +
> + pcie->mem = entry->res;
> + pci_add_resource(&res, &pcie->io);
> + pci_add_resource(&res, entry->res);
> + list_splice_init(&res, &host->windows);
> +
> + return 0;
> +}
> +
> +static int mt7621_pcie_parse_port(struct mt7621_pcie *pcie,
> + int slot)
> +{
> + struct mt7621_pcie_port *port;
> + struct device *dev = pcie->dev;
> + struct platform_device *pdev = to_platform_device(dev);
> + char name[10];
> +
> + port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
> + if (!port)
> + return -ENOMEM;
> +
> + port->base = devm_platform_ioremap_resource(pdev, slot + 1);
> + if (IS_ERR(port->base))
> + return PTR_ERR(port->base);
> +
> + snprintf(name, sizeof(name), "pcie%d", slot);
> + port->clk = devm_clk_get(dev, name);
> + if (IS_ERR(port->clk)) {
> + dev_err(dev, "failed to get pcie%d clock\n", slot);
> + return PTR_ERR(port->clk);
> + }
> +
> + snprintf(name, sizeof(name), "pcie%d", slot);
> + port->pcie_rst = devm_reset_control_get_exclusive(dev, name);
> + if (PTR_ERR(port->pcie_rst) == -EPROBE_DEFER) {
> + dev_err(dev, "failed to get pcie%d reset control\n", slot);
> + return PTR_ERR(port->pcie_rst);
> + }
> +
> + snprintf(name, sizeof(name), "pcie-phy%d", slot);
> + port->phy = devm_phy_get(dev, name);
> + if (IS_ERR(port->phy) && slot != 1)
> + return PTR_ERR(port->phy);
> +
> + port->gpio_rst = devm_gpiod_get_index_optional(dev, "reset", slot,
> + GPIOD_OUT_LOW);
> + if (IS_ERR(port->gpio_rst)) {
> + dev_err(dev, "Failed to get GPIO for PCIe%d\n", slot);
> + return PTR_ERR(port->gpio_rst);
> + }
> +
> + port->slot = slot;
> + port->pcie = pcie;
> +
> + INIT_LIST_HEAD(&port->list);
> + list_add_tail(&port->list, &pcie->ports);
> +
> + return 0;
> +}
> +
> +static int mt7621_pcie_parse_dt(struct mt7621_pcie *pcie)
> +{
> + struct device *dev = pcie->dev;
> + struct platform_device *pdev = to_platform_device(dev);
> + struct device_node *node = dev->of_node, *child;
> + int err;
> +
> + pcie->base = devm_platform_ioremap_resource(pdev, 0);
> + if (IS_ERR(pcie->base))
> + return PTR_ERR(pcie->base);
> +
> + for_each_available_child_of_node(node, child) {
> + int slot;
> +
> + err = of_pci_get_devfn(child);
> + if (err < 0) {
> + of_node_put(child);
> + dev_err(dev, "failed to parse devfn: %d\n", err);
> + return err;
> + }
> +
> + slot = PCI_SLOT(err);
> +
> + err = mt7621_pcie_parse_port(pcie, slot);
> + if (err) {
> + of_node_put(child);
> + return err;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static int mt7621_pcie_init_port(struct mt7621_pcie_port *port)
> +{
> + struct mt7621_pcie *pcie = port->pcie;
> + struct device *dev = pcie->dev;
> + u32 slot = port->slot;
> + int err;
> +
> + err = phy_init(port->phy);
> + if (err) {
> + dev_err(dev, "failed to initialize port%d phy\n", slot);
> + return err;
> + }
> +
> + err = phy_power_on(port->phy);
> + if (err) {
> + dev_err(dev, "failed to power on port%d phy\n", slot);
> + phy_exit(port->phy);
> + return err;
> + }
> +
> + port->enabled = true;
> +
> + return 0;
> +}
> +
> +static void mt7621_pcie_reset_assert(struct mt7621_pcie *pcie)
> +{
> + struct mt7621_pcie_port *port;
> +
> + list_for_each_entry(port, &pcie->ports, list) {
> + /* PCIe RC reset assert */
> + mt7621_control_assert(port);
> +
> + /* PCIe EP reset assert */
> + mt7621_rst_gpio_pcie_assert(port);
> + }
> +
> + msleep(PERST_DELAY_MS);
> +}
> +
> +static void mt7621_pcie_reset_rc_deassert(struct mt7621_pcie *pcie)
> +{
> + struct mt7621_pcie_port *port;
> +
> + list_for_each_entry(port, &pcie->ports, list)
> + mt7621_control_deassert(port);
> +}
> +
> +static void mt7621_pcie_reset_ep_deassert(struct mt7621_pcie *pcie)
> +{
> + struct mt7621_pcie_port *port;
> +
> + list_for_each_entry(port, &pcie->ports, list)
> + mt7621_rst_gpio_pcie_deassert(port);
> +
> + msleep(PERST_DELAY_MS);
> +}
> +
> +static void mt7621_pcie_init_ports(struct mt7621_pcie *pcie)
> +{
> + struct device *dev = pcie->dev;
> + struct mt7621_pcie_port *port, *tmp;
> + int err;
> +
> + mt7621_pcie_reset_assert(pcie);
> + mt7621_pcie_reset_rc_deassert(pcie);
> +
> + list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
> + u32 slot = port->slot;
> +
> + if (slot == 1) {
> + port->enabled = true;
> + continue;
> + }
> +
> + err = mt7621_pcie_init_port(port);
> + if (err) {
> + dev_err(dev, "Initiating port %d failed\n", slot);
> + list_del(&port->list);
> + }
> + }
> +
> + mt7621_pcie_reset_ep_deassert(pcie);
> +
> + tmp = NULL;
> + list_for_each_entry(port, &pcie->ports, list) {
> + u32 slot = port->slot;
> +
> + if (!mt7621_pcie_port_is_linkup(port)) {
> + dev_err(dev, "pcie%d no card, disable it (RST & CLK)\n",
> + slot);
> + mt7621_control_assert(port);
> + clk_disable_unprepare(port->clk);
> + port->enabled = false;
> +
> + if (slot == 0) {
> + tmp = port;
> + continue;
> + }
> +
> + if (slot == 1 && tmp && !tmp->enabled)
> + phy_power_off(tmp->phy);
> + }
> + }
> +}
> +
> +static void mt7621_pcie_enable_port(struct mt7621_pcie_port *port)
> +{
> + struct mt7621_pcie *pcie = port->pcie;
> + u32 slot = port->slot;
> + u32 offset = MT7621_PCIE_OFFSET + (slot * MT7621_NEXT_PORT);
> + u32 val;
> +
> + /* enable pcie interrupt */
> + val = pcie_read(pcie, RALINK_PCI_PCIMSK_ADDR);
> + val |= PCIE_PORT_INT_EN(slot);
> + pcie_write(pcie, val, RALINK_PCI_PCIMSK_ADDR);
> +
> + /* map 2G DDR region */
> + pcie_write(pcie, PCIE_BAR_MAP_MAX | PCIE_BAR_ENABLE,
> + offset + RALINK_PCI_BAR0SETUP_ADDR);
> +
> + /* configure class code and revision ID */
> + pcie_write(pcie, PCIE_CLASS_CODE | PCIE_REVISION_ID,
> + offset + RALINK_PCI_CLASS);
> +}
> +
> +static int mt7621_pcie_enable_ports(struct mt7621_pcie *pcie)
> +{
> + struct device *dev = pcie->dev;
> + struct mt7621_pcie_port *port;
> + u8 num_slots_enabled = 0;
> + u32 slot;
> + u32 val;
> + int err;
> +
> + /* Setup MEMWIN and IOWIN */
> + pcie_write(pcie, 0xffffffff, RALINK_PCI_MEMBASE);
> + pcie_write(pcie, pcie->io.start, RALINK_PCI_IOBASE);
> +
> + list_for_each_entry(port, &pcie->ports, list) {
> + if (port->enabled) {
> + err = clk_prepare_enable(port->clk);
> + if (err) {
> + dev_err(dev, "enabling clk pcie%d\n", slot);
> + return err;
> + }
> +
> + mt7621_pcie_enable_port(port);
> + dev_info(dev, "PCIE%d enabled\n", port->slot);
> + num_slots_enabled++;
> + }
> + }
> +
> + for (slot = 0; slot < num_slots_enabled; slot++) {
> + val = read_config(pcie, slot, PCI_COMMAND);
> + val |= PCI_COMMAND_MASTER;
> + write_config(pcie, slot, PCI_COMMAND, val);
> + /* configure RC FTS number to 250 when it leaves L0s */
> + val = read_config(pcie, slot, PCIE_FTS_NUM);
> + val &= ~PCIE_FTS_NUM_MASK;
> + val |= PCIE_FTS_NUM_L0(0x50);
> + write_config(pcie, slot, PCIE_FTS_NUM, val);
> + }
> +
> + return 0;
> +}
> +
> +static int mt7621_pcie_register_host(struct pci_host_bridge *host)
> +{
> + struct mt7621_pcie *pcie = pci_host_bridge_priv(host);
> +
> + host->ops = &mt7621_pci_ops;
> + host->sysdata = pcie;
> + return pci_host_probe(host);
> +}
> +
> +static const struct soc_device_attribute mt7621_pci_quirks_match[] = {
> + { .soc_id = "mt7621", .revision = "E2" }
> +};
> +
> +static int mt7621_pci_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + const struct soc_device_attribute *attr;
> + struct mt7621_pcie *pcie;
> + struct pci_host_bridge *bridge;
> + int err;
> +
> + if (!dev->of_node)
> + return -ENODEV;
> +
> + bridge = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
> + if (!bridge)
> + return -ENOMEM;
> +
> + pcie = pci_host_bridge_priv(bridge);
> + pcie->dev = dev;
> + platform_set_drvdata(pdev, pcie);
> + INIT_LIST_HEAD(&pcie->ports);
> +
> + attr = soc_device_match(mt7621_pci_quirks_match);
> + if (attr)
> + pcie->resets_inverted = true;
> +
> + err = mt7621_pcie_parse_dt(pcie);
> + if (err) {
> + dev_err(dev, "Parsing DT failed\n");
> + return err;
> + }
> +
> + err = mt7621_pci_parse_request_of_pci_ranges(bridge);
> + if (err) {
> + dev_err(dev, "Error requesting pci resources from ranges");
> + return err;
> + }
> +
> + /* set resources limits */
> + ioport_resource.start = pcie->io.start;
> + ioport_resource.end = pcie->io.end;
> +
> + mt7621_pcie_init_ports(pcie);
> +
> + err = mt7621_pcie_enable_ports(pcie);
> + if (err) {
> + dev_err(dev, "Error enabling pcie ports\n");
> + return err;
> + }
> +
> + setup_cm_memory_region(pcie);
> +
> + return mt7621_pcie_register_host(bridge);
> +}
> +
> +static const struct of_device_id mt7621_pci_ids[] = {
> + { .compatible = "mediatek,mt7621-pci" },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, mt7621_pci_ids);
> +
> +static struct platform_driver mt7621_pci_driver = {
> + .probe = mt7621_pci_probe,
> + .driver = {
> + .name = "mt7621-pci",
> + .of_match_table = of_match_ptr(mt7621_pci_ids),
> + },
> +};
> +builtin_platform_driver(mt7621_pci_driver);
> diff --git a/arch/mips/ralink/Kconfig b/arch/mips/ralink/Kconfig
> index ec4daa63c5e3..50e5a54f7d9e 100644
> --- a/arch/mips/ralink/Kconfig
> +++ b/arch/mips/ralink/Kconfig
> @@ -56,7 +56,7 @@ choice
> select MIPS_GIC
> select COMMON_CLK
> select CLKSRC_MIPS_GIC
> - select HAVE_PCI if PCI_MT7621
> + select HAVE_PCI
> select SOC_BUS
> endchoice
>
> @@ -101,4 +101,11 @@ choice
>
> endchoice
>
> +config PCI_MT7621
> + bool "MediaTek MT7621 PCI Controller"
> + depends on RALINK && SOC_MT7621
> + select PCI_DRIVERS_GENERIC
> + help
> + This selects a driver for the MediaTek MT7621 PCI Controller.
> +
> endif
> --
> 2.25.1
>