[PATCH v4 2/3] pinctrl: pinctrl-mchp-sgpio: Add pinctrl driver for Microsemi Serial GPIO
Lars Povlsen
lars.povlsen at microchip.com
Wed Oct 7 07:11:44 EDT 2020
This adds a pinctrl driver for the Microsemi/Microchip Serial GPIO
(SGPIO) device used in various SoC's.
Signed-off-by: Lars Povlsen <lars.povlsen at microchip.com>
---
MAINTAINERS | 1 +
drivers/pinctrl/Kconfig | 18 +
drivers/pinctrl/Makefile | 1 +
drivers/pinctrl/pinctrl-microchip-sgpio.c | 676 ++++++++++++++++++++++
4 files changed, 696 insertions(+)
create mode 100644 drivers/pinctrl/pinctrl-microchip-sgpio.c
diff --git a/MAINTAINERS b/MAINTAINERS
index cc70e3ab428b..a8cc028b84d0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2137,6 +2137,7 @@ M: Microchip Linux Driver Support <UNGLinuxDriver at microchip.com>
L: linux-arm-kernel at lists.infradead.org (moderated for non-subscribers)
S: Supported
F: arch/arm64/boot/dts/microchip/
+F: drivers/pinctrl/pinctrl-microchip-sgpio.c
N: sparx5
ARM/MIOA701 MACHINE SUPPORT
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 8828613c4e0e..1b3527d4c3c8 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -404,6 +404,24 @@ config PINCTRL_OCELOT
select OF_GPIO
select REGMAP_MMIO
+config PINCTRL_MICROCHIP_SGPIO
+ bool "Pinctrl driver for Microsemi/Microchip Serial GPIO"
+ depends on OF
+ depends on HAS_IOMEM
+ select GPIOLIB
+ select GENERIC_PINCONF
+ select GENERIC_PINCTRL_GROUPS
+ select GENERIC_PINMUX_FUNCTIONS
+ select OF_GPIO
+ help
+ Support for the serial GPIO interface used on Microsemi and
+ Microchip SoC's. By using a serial interface, the SIO
+ controller significantly extends the number of available
+ GPIOs with a minimum number of additional pins on the
+ device. The primary purpose of the SIO controller is to
+ connect control signals from SFP modules and to act as an
+ LED controller.
+
source "drivers/pinctrl/actions/Kconfig"
source "drivers/pinctrl/aspeed/Kconfig"
source "drivers/pinctrl/bcm/Kconfig"
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index 1731b2154df9..347b0e015960 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -49,6 +49,7 @@ obj-$(CONFIG_PINCTRL_ZYNQ) += pinctrl-zynq.o
obj-$(CONFIG_PINCTRL_INGENIC) += pinctrl-ingenic.o
obj-$(CONFIG_PINCTRL_RK805) += pinctrl-rk805.o
obj-$(CONFIG_PINCTRL_OCELOT) += pinctrl-ocelot.o
+obj-$(CONFIG_PINCTRL_MICROCHIP_SGPIO) += pinctrl-microchip-sgpio.o
obj-$(CONFIG_PINCTRL_EQUILIBRIUM) += pinctrl-equilibrium.o
obj-y += actions/
diff --git a/drivers/pinctrl/pinctrl-microchip-sgpio.c b/drivers/pinctrl/pinctrl-microchip-sgpio.c
new file mode 100644
index 000000000000..ccee60bc9f77
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-microchip-sgpio.c
@@ -0,0 +1,676 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Microsemi/Microchip SoCs serial gpio driver
+ *
+ * Author: <lars.povlsen at microchip.com>
+ *
+ * Copyright (c) 2020 Microchip Technology Inc. and its subsidiaries.
+ */
+
+#include <linux/gpio/driver.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/clk.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/platform_device.h>
+
+#include "core.h"
+#include "pinconf.h"
+#include "pinmux.h"
+
+#define SGPIO_BITS_PER_WORD 32
+#define SGPIO_MAX_BITS 4
+
+#define PIN_NAM_SZ (sizeof("SGPIO_D_pXXbY")+1)
+
+enum {
+ REG_INPUT_DATA,
+ REG_PORT_CONFIG,
+ REG_PORT_ENABLE,
+ REG_SIO_CONFIG,
+ REG_SIO_CLOCK,
+ MAXREG
+};
+
+struct sgpio_properties {
+ u8 regoff[MAXREG];
+ u32 auto_repeat;
+ u32 port_width;
+ u32 clk_freq;
+ u32 bit_source;
+};
+
+#define __shf(x) (__builtin_ffsll(x) - 1)
+#define __BF_PREP(bf, x) (bf & ((x) << __shf(bf)))
+#define __BF_GET(bf, x) (((x & bf) >> __shf(bf)))
+
+#define SGPIO_M_CFG_SIO_AUTO_REPEAT(p) ((p)->properties->auto_repeat)
+#define SGPIO_F_CFG_SIO_PORT_WIDTH(p, x) __BF_PREP((p)->properties->port_width, x)
+#define SGPIO_M_CFG_SIO_PORT_WIDTH(p) ((p)->properties->port_width)
+#define SGPIO_F_CLOCK_SIO_CLK_FREQ(p, x) __BF_PREP((p)->properties->clk_freq, x)
+#define SGPIO_M_CLOCK_SIO_CLK_FREQ(p) ((p)->properties->clk_freq)
+#define SGPIO_F_PORT_CFG_BIT_SOURCE(p, x) __BF_PREP((p)->properties->bit_source, x)
+#define SGPIO_X_PORT_CFG_BIT_SOURCE(p, x) __BF_GET((p)->properties->bit_source, x)
+
+const struct sgpio_properties properties_luton = {
+ .regoff = { 0x00, 0x09, 0x29, 0x2a, 0x2b },
+ .auto_repeat = BIT(5),
+ .port_width = GENMASK(3, 2),
+ .clk_freq = GENMASK(11, 0),
+ .bit_source = GENMASK(11, 0),
+};
+
+const struct sgpio_properties properties_ocelot = {
+ .regoff = { 0x00, 0x06, 0x26, 0x04, 0x05 },
+ .auto_repeat = BIT(10),
+ .port_width = GENMASK(8, 7),
+ .clk_freq = GENMASK(19, 8),
+ .bit_source = GENMASK(23, 12),
+};
+
+const struct sgpio_properties properties_sparx5 = {
+ .regoff = { 0x00, 0x06, 0x26, 0x04, 0x05 },
+ .auto_repeat = BIT(6),
+ .port_width = GENMASK(4, 3),
+ .clk_freq = GENMASK(19, 8),
+ .bit_source = GENMASK(23, 12),
+};
+
+static const char * const functions[] = { "gpio" };
+
+struct sgpio_priv {
+ struct device *dev;
+ /* 2 banks: IN/OUT */
+ struct {
+ struct gpio_chip gpio;
+ struct pinctrl_desc pctl_desc;
+ struct pinctrl_dev *pctl_dev;
+ } bank[2];
+ u32 bitcount;
+ u32 ports;
+ u32 clock;
+ u32 __iomem *regs;
+ const struct sgpio_properties *properties;
+};
+
+struct sgpio_port_addr {
+ u8 port;
+ u8 bit;
+};
+
+static inline bool sgpio_pctl_is_input(struct sgpio_priv *priv,
+ struct pinctrl_dev *pctl)
+{
+ /* 1st index is input */
+ return pctl == priv->bank[0].pctl_dev;
+}
+
+static inline bool sgpio_gpio_is_input(struct sgpio_priv *priv,
+ struct gpio_chip *gc)
+{
+ /* 1st index is input */
+ return gc == &priv->bank[0].gpio;
+}
+
+static inline void sgpio_pin_to_addr(struct sgpio_priv *priv, int pin,
+ struct sgpio_port_addr *addr)
+{
+ addr->port = pin / priv->bitcount;
+ addr->bit = pin % priv->bitcount;
+}
+
+static inline u32 sgpio_readl(struct sgpio_priv *priv, u32 rno, u32 off)
+{
+ u32 __iomem *reg = &priv->regs[priv->properties->regoff[rno] + off];
+
+ return readl(reg);
+}
+
+static inline void sgpio_writel(struct sgpio_priv *priv,
+ u32 val, u32 rno, u32 off)
+{
+ u32 __iomem *reg = &priv->regs[priv->properties->regoff[rno] + off];
+
+ writel(val, reg);
+}
+
+static inline void sgpio_clrsetbits(struct sgpio_priv *priv,
+ u32 rno, u32 off, u32 clear, u32 set)
+{
+ u32 __iomem *reg = &priv->regs[priv->properties->regoff[rno] + off];
+ u32 val = readl(reg);
+
+ val &= ~clear;
+ val |= set;
+
+ writel(val, reg);
+}
+
+static void sgpio_output_set(struct sgpio_priv *priv,
+ struct sgpio_port_addr *addr,
+ int value)
+{
+ u32 mask = 3 << (3 * addr->bit);
+
+ value = (value & 3) << (3 * addr->bit);
+ sgpio_clrsetbits(priv, REG_PORT_CONFIG, addr->port,
+ SGPIO_F_PORT_CFG_BIT_SOURCE(priv, mask),
+ SGPIO_F_PORT_CFG_BIT_SOURCE(priv, value));
+}
+
+static int sgpio_output_get(struct sgpio_priv *priv,
+ struct sgpio_port_addr *addr)
+{
+ u32 portval = sgpio_readl(priv, REG_PORT_CONFIG, addr->port);
+ int ret;
+
+ ret = SGPIO_X_PORT_CFG_BIT_SOURCE(priv, portval);
+ ret = !!(ret & (3 << (3 * addr->bit)));
+
+ return ret;
+}
+
+static int sgpio_input_get(struct sgpio_priv *priv,
+ struct sgpio_port_addr *addr)
+{
+ int ret;
+
+ ret = !!(sgpio_readl(priv, REG_INPUT_DATA, addr->bit) &
+ BIT(addr->port));
+
+ return ret;
+}
+
+static int sgpio_pinconf_get(struct pinctrl_dev *pctldev,
+ unsigned int pin, unsigned long *config)
+{
+ struct sgpio_priv *priv = pinctrl_dev_get_drvdata(pctldev);
+ bool is_input = sgpio_pctl_is_input(priv, pctldev);
+ struct sgpio_port_addr addr;
+ u32 param = pinconf_to_config_param(*config);
+ int val;
+
+ sgpio_pin_to_addr(priv, pin, &addr);
+
+ switch (param) {
+ case PIN_CONFIG_INPUT_ENABLE:
+ val = is_input;
+ break;
+
+ case PIN_CONFIG_OUTPUT_ENABLE:
+ val = !is_input;
+ break;
+
+ case PIN_CONFIG_OUTPUT:
+ if (is_input)
+ return -EINVAL;
+ val = sgpio_output_get(priv, &addr);
+ break;
+
+ default:
+ return -EOPNOTSUPP;
+ }
+
+ *config = pinconf_to_config_packed(param, val);
+
+ return 0;
+}
+
+static int sgpio_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
+ unsigned long *configs, unsigned int num_configs)
+{
+ struct sgpio_priv *priv = pinctrl_dev_get_drvdata(pctldev);
+ bool is_input = sgpio_pctl_is_input(priv, pctldev);
+ struct sgpio_port_addr addr;
+ u32 param, arg;
+ int cfg, err = 0;
+
+ sgpio_pin_to_addr(priv, pin, &addr);
+
+ for (cfg = 0; cfg < num_configs; cfg++) {
+ param = pinconf_to_config_param(configs[cfg]);
+ arg = pinconf_to_config_argument(configs[cfg]);
+
+ switch (param) {
+ case PIN_CONFIG_OUTPUT:
+ if (is_input)
+ return -EINVAL;
+ sgpio_output_set(priv, &addr, arg);
+ break;
+
+ default:
+ err = -EOPNOTSUPP;
+ }
+ }
+
+ return err;
+}
+
+static const struct pinconf_ops sgpio_confops = {
+ .is_generic = true,
+ .pin_config_get = sgpio_pinconf_get,
+ .pin_config_set = sgpio_pinconf_set,
+ .pin_config_config_dbg_show = pinconf_generic_dump_config,
+};
+
+static int sgpio_get_functions_count(struct pinctrl_dev *pctldev)
+{
+ return 1;
+}
+
+static const char *sgpio_get_function_name(struct pinctrl_dev *pctldev,
+ unsigned int function)
+{
+ return functions[0];
+}
+
+static int sgpio_get_function_groups(struct pinctrl_dev *pctldev,
+ unsigned int function,
+ const char *const **groups,
+ unsigned *const num_groups)
+{
+ *groups = functions;
+ *num_groups = ARRAY_SIZE(functions);
+
+ return 0;
+}
+
+static int sgpio_pinmux_set_mux(struct pinctrl_dev *pctldev,
+ unsigned int selector, unsigned int group)
+{
+ return 0;
+}
+
+static int sgpio_gpio_set_direction(struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range,
+ unsigned int pin, bool input)
+{
+ struct sgpio_priv *priv = pinctrl_dev_get_drvdata(pctldev);
+
+ if (input != sgpio_pctl_is_input(priv, pctldev)) {
+ dev_err(priv->dev, "Pin %d direction as %s is not possible\n",
+ pin, input ? "input" : "output");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int sgpio_gpio_request_enable(struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range,
+ unsigned int offset)
+{
+ struct sgpio_priv *priv = pinctrl_dev_get_drvdata(pctldev);
+ struct sgpio_port_addr addr;
+
+ sgpio_pin_to_addr(priv, offset, &addr);
+
+ if ((priv->ports & BIT(addr.port)) == 0) {
+ dev_warn(priv->dev, "%s: Request port %d for pin %d is not activated\n",
+ __func__, addr.port, offset);
+ }
+
+ return 0;
+}
+
+static const struct pinmux_ops sgpio_pmx_ops = {
+ .get_functions_count = sgpio_get_functions_count,
+ .get_function_name = sgpio_get_function_name,
+ .get_function_groups = sgpio_get_function_groups,
+ .set_mux = sgpio_pinmux_set_mux,
+ .gpio_set_direction = sgpio_gpio_set_direction,
+ .gpio_request_enable = sgpio_gpio_request_enable,
+};
+
+static int sgpio_pctl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+ struct sgpio_priv *priv = pinctrl_dev_get_drvdata(pctldev);
+ int bank = !sgpio_pctl_is_input(priv, pctldev);
+
+ return priv->bank[bank].pctl_desc.npins;
+}
+
+static const char *sgpio_pctl_get_group_name(struct pinctrl_dev *pctldev,
+ unsigned int group)
+{
+ struct sgpio_priv *priv = pinctrl_dev_get_drvdata(pctldev);
+ int bank = !sgpio_pctl_is_input(priv, pctldev);
+
+ return priv->bank[bank].pctl_desc.pins[group].name;
+}
+
+static int sgpio_pctl_get_group_pins(struct pinctrl_dev *pctldev,
+ unsigned int group,
+ const unsigned int **pins,
+ unsigned int *num_pins)
+{
+ struct sgpio_priv *priv = pinctrl_dev_get_drvdata(pctldev);
+ int bank = !sgpio_pctl_is_input(priv, pctldev);
+
+ *pins = &priv->bank[bank].pctl_desc.pins[group].number;
+ *num_pins = 1;
+
+ return 0;
+}
+
+static const struct pinctrl_ops sgpio_pctl_ops = {
+ .get_groups_count = sgpio_pctl_get_groups_count,
+ .get_group_name = sgpio_pctl_get_group_name,
+ .get_group_pins = sgpio_pctl_get_group_pins,
+ .dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
+ .dt_free_map = pinconf_generic_dt_free_map,
+};
+
+static int microchip_sgpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
+{
+ struct sgpio_priv *priv = gpiochip_get_data(gc);
+
+ /* Fixed-position function */
+ return sgpio_gpio_is_input(priv, gc) ? 0 : -EINVAL;
+}
+
+static int microchip_sgpio_direction_output(struct gpio_chip *gc,
+ unsigned int gpio, int value)
+{
+ struct sgpio_priv *priv = gpiochip_get_data(gc);
+ bool is_input = sgpio_gpio_is_input(priv, gc);
+ struct sgpio_port_addr addr;
+
+ sgpio_pin_to_addr(priv, gpio, &addr);
+
+ /* Fixed-position function */
+ if (is_input)
+ return -EINVAL;
+
+ sgpio_output_set(priv, &addr, value);
+
+ return 0;
+}
+
+static int microchip_sgpio_get_direction(struct gpio_chip *gc, unsigned int gpio)
+{
+ struct sgpio_priv *priv = gpiochip_get_data(gc);
+
+ return sgpio_gpio_is_input(priv, gc); /* 0=out, 1=in */
+}
+
+static void microchip_sgpio_set_value(struct gpio_chip *gc,
+ unsigned int gpio, int value)
+{
+ microchip_sgpio_direction_output(gc, gpio, value);
+}
+
+static int microchip_sgpio_get_value(struct gpio_chip *gc, unsigned int gpio)
+{
+ struct sgpio_priv *priv = gpiochip_get_data(gc);
+ struct sgpio_port_addr addr;
+ int ret;
+
+ sgpio_pin_to_addr(priv, gpio, &addr);
+
+ if (sgpio_gpio_is_input(priv, gc))
+ ret = sgpio_input_get(priv, &addr);
+ else
+ ret = sgpio_output_get(priv, &addr);
+
+ return ret;
+}
+
+static int microchip_sgpio_of_xlate(struct gpio_chip *gc,
+ const struct of_phandle_args *gpiospec,
+ u32 *flags)
+{
+ struct sgpio_priv *priv = gpiochip_get_data(gc);
+ int pin;
+
+ if (gpiospec->args[0] > SGPIO_BITS_PER_WORD ||
+ gpiospec->args[1] > priv->bitcount)
+ return -EINVAL;
+
+ pin = gpiospec->args[1] + (gpiospec->args[0] * priv->bitcount);
+
+ if (pin > gc->ngpio)
+ return -EINVAL;
+
+ if (flags)
+ *flags = gpiospec->args[2];
+
+ return pin;
+}
+
+static int microchip_sgpio_get_ports(struct sgpio_priv *priv)
+{
+ struct device *dev = priv->dev;
+ struct device_node *np = dev->of_node;
+ int i, ret;
+ u32 range_params[64];
+
+ /* Calculate port mask */
+ ret = of_property_read_variable_u32_array(np,
+ "microchip,sgpio-port-ranges",
+ range_params,
+ 2,
+ ARRAY_SIZE(range_params));
+ if (ret < 0 || ret % 2) {
+ dev_err(dev, "%s port range\n",
+ ret == -EINVAL ? "Missing" : "Invalid");
+ return ret;
+ }
+ for (i = 0; i < ret; i += 2) {
+ int start, end;
+
+ start = range_params[i];
+ end = range_params[i + 1];
+ if (start > end || end >= SGPIO_BITS_PER_WORD) {
+ dev_err(dev, "Ill-formed port-range [%d:%d]\n",
+ start, end);
+ }
+ priv->ports |= GENMASK(end, start);
+ }
+
+ return 0;
+}
+
+static int microchip_sgpio_register_bank(struct device *dev,
+ struct sgpio_priv *priv,
+ struct fwnode_handle *fwnode,
+ int bank)
+{
+ struct pinctrl_dev *pctl;
+ struct pinctrl_pin_desc *pins;
+ struct pinctrl_desc *pctl_desc;
+ struct gpio_chip *gc;
+ bool is_input = (bank == 0);
+ int ret;
+ u32 ngpios;
+
+ if (fwnode_property_read_u32(fwnode, "ngpios", &ngpios)) {
+ dev_info(dev, "failed to get number of gpios for bank%d\n",
+ bank);
+ ngpios = 64;
+ }
+
+ priv->bitcount = ngpios / SGPIO_BITS_PER_WORD;
+ if (priv->bitcount > SGPIO_MAX_BITS) {
+ dev_err(dev, "Bit width exceeds maximum (%d)\n",
+ SGPIO_MAX_BITS);
+ return -EINVAL;
+ }
+
+ pctl_desc = &priv->bank[bank].pctl_desc;
+ pctl_desc->name = devm_kasprintf(dev, GFP_KERNEL, "%s-%sput",
+ dev_name(dev),
+ is_input ? "in" : "out");
+ pctl_desc->pctlops = &sgpio_pctl_ops;
+ pctl_desc->pmxops = &sgpio_pmx_ops;
+ pctl_desc->confops = &sgpio_confops;
+ pctl_desc->owner = THIS_MODULE;
+
+ pins = devm_kzalloc(dev, sizeof(*pins)*ngpios, GFP_KERNEL);
+ if (pins) {
+ int i;
+ char *p, *names;
+
+ names = devm_kzalloc(dev, PIN_NAM_SZ*ngpios, GFP_KERNEL);
+
+ if (!names)
+ return -ENOMEM;
+
+ pctl_desc->npins = ngpios;
+ pctl_desc->pins = pins;
+
+ for (p = names, i = 0; i < ngpios; i++, p += PIN_NAM_SZ) {
+ struct sgpio_port_addr addr;
+
+ sgpio_pin_to_addr(priv, i, &addr);
+ snprintf(p, PIN_NAM_SZ, "SGPIO_%c_p%db%d",
+ is_input ? 'I' : 'O',
+ addr.port, addr.bit);
+ pins[i].number = i;
+ pins[i].name = p;
+ }
+ } else
+ return -ENOMEM;
+
+ pctl = devm_pinctrl_register(dev, pctl_desc, priv);
+ if (IS_ERR(pctl)) {
+ dev_err(dev, "Failed to register pinctrl\n");
+ return PTR_ERR(pctl);
+ }
+
+ gc = &priv->bank[bank].gpio;
+ gc->label = pctl_desc->name;
+ gc->parent = dev;
+ gc->of_node = to_of_node(fwnode);
+ gc->owner = THIS_MODULE;
+ gc->get_direction = microchip_sgpio_get_direction;
+ gc->direction_input = microchip_sgpio_direction_input;
+ gc->direction_output = microchip_sgpio_direction_output;
+ gc->get = microchip_sgpio_get_value;
+ gc->set = microchip_sgpio_set_value;
+ gc->request = gpiochip_generic_request;
+ gc->free = gpiochip_generic_free;
+ gc->of_xlate = microchip_sgpio_of_xlate;
+ gc->of_gpio_n_cells = 3;
+ gc->base = -1;
+ gc->ngpio = ngpios;
+
+ ret = devm_gpiochip_add_data(dev, gc, priv);
+ if (ret == 0)
+ dev_info(pctl->dev, "Registered %d GPIOs\n", ngpios);
+ else
+ dev_err(pctl->dev, "Failed to register: ret %d\n", ret);
+
+ priv->bank[bank].pctl_dev = pctl;
+
+ return ret;
+}
+
+static int microchip_sgpio_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct fwnode_handle *fwnode;
+ struct sgpio_priv *priv;
+ int div_clock = 0, ret, port;
+ u32 val;
+ struct resource *regs;
+ struct clk *clk;
+ int i, nbanks;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->dev = dev;
+
+ /* Get clock */
+ clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(clk)) {
+ dev_err(dev, "Failed to get clock\n");
+ return PTR_ERR(clk);
+ }
+ div_clock = clk_get_rate(clk);
+ if (device_property_read_u32(dev, "microchip,sgpio-frequency",
+ &priv->clock))
+ priv->clock = 12500000;
+ if (priv->clock <= 0 || priv->clock > div_clock) {
+ dev_err(dev, "Invalid frequency %d\n", priv->clock);
+ return -EINVAL;
+ }
+
+ /* Get register map */
+ regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ priv->regs = devm_ioremap_resource(dev, regs);
+ if (IS_ERR(priv->regs))
+ return PTR_ERR(priv->regs);
+ priv->properties = of_device_get_match_data(dev);
+
+ /* Get rest of device properties */
+ ret = microchip_sgpio_get_ports(priv);
+ if (ret)
+ return ret;
+
+ nbanks = device_get_child_node_count(dev);
+ if (nbanks != 2) {
+ dev_err(dev, "Must have 2 banks (have %d)\n", nbanks);
+ return -EINVAL;
+ }
+
+ i = 0;
+ device_for_each_child_node(dev, fwnode) {
+ ret = microchip_sgpio_register_bank(dev, priv, fwnode, i++);
+ if (ret)
+ return ret;
+ }
+
+ if (priv->bank[0].gpio.ngpio != priv->bank[0].gpio.ngpio) {
+ dev_err(dev, "Banks must have same GPIO count\n");
+ return -EINVAL;
+ }
+
+ sgpio_clrsetbits(priv, REG_SIO_CONFIG, 0,
+ SGPIO_M_CFG_SIO_PORT_WIDTH(priv),
+ SGPIO_F_CFG_SIO_PORT_WIDTH(priv, priv->bitcount - 1) |
+ SGPIO_M_CFG_SIO_AUTO_REPEAT(priv));
+ val = max(2U, div_clock / priv->clock);
+ sgpio_clrsetbits(priv, REG_SIO_CLOCK, 0,
+ SGPIO_M_CLOCK_SIO_CLK_FREQ(priv),
+ SGPIO_F_CLOCK_SIO_CLK_FREQ(priv, val));
+
+ for (port = 0; port < SGPIO_BITS_PER_WORD; port++)
+ sgpio_writel(priv, 0, REG_PORT_CONFIG, port);
+ sgpio_writel(priv, priv->ports, REG_PORT_ENABLE, 0);
+
+ return 0;
+}
+
+static const struct of_device_id microchip_sgpio_gpio_of_match[] = {
+ {
+ .compatible = "microchip,sparx5-sgpio",
+ .data = &properties_sparx5,
+ }, {
+ .compatible = "mscc,luton-sgpio",
+ .data = &properties_luton,
+ }, {
+ .compatible = "mscc,ocelot-sgpio",
+ .data = &properties_ocelot,
+ }, {
+ /* sentinel */
+ }
+};
+
+static struct platform_driver microchip_sgpio_pinctrl_driver = {
+ .driver = {
+ .name = "pinctrl-microchip-sgpio",
+ .of_match_table = microchip_sgpio_gpio_of_match,
+ .suppress_bind_attrs = true,
+ },
+ .probe = microchip_sgpio_probe,
+};
+builtin_platform_driver(microchip_sgpio_pinctrl_driver);
--
2.25.1
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