[PATCH v3 0/2] pinctrl: Add new pinctrl/GPIO driver

[PATCH v3 0/2] pinctrl: Add new pinctrl/GPIO driver

[Rahul Tanwar]

Hi,

This series is to add pinctrl & GPIO controller driver for a new SoC.
Patch 1 adds pinmux & GPIO controller driver.
Patch 2 adds the corresponding dt bindings YAML document.

Patches are against Linux 5.4-rc1 at below Git tree:
git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl.git

v3:
- Add locking for GPIO IRQ ops.
- Fix property naming mistake in dt bindings document.
- Address other code quality related review concerns.
- Fix a build error reported by kbuild test robot.
- Remove deleted structure fields from comments.

v2:
- Enable GENERIC_PINMUX_FUNCTIONS & GENERIC_PINCTRL_GROUPS and use core
  provided code for pinmux_ops & pinctrl_ops. Remove related code from
  the driver.
- Enable GENERIC_PINCONF & use core provided pinconf code. Remove related
  code from the driver.
- Use GPIOLIB_IRQCHIP framework core code instead of implementing separtely
  in the driver.
- Enable GPIO_GENERIC and switch to core provided memory mapped GPIO banks
  design. 
- Use standard pinctrl DT properties instead of custom made properties.
- Address review concerns for dt bindings document.
- Address code quality related review concerns.

v1:
- Initial version.




Rahul Tanwar (2):
  pinctrl: Add pinmux & GPIO controller driver for a new SoC
  dt-bindings: pinctrl: intel: Add for new SoC

 .../bindings/pinctrl/intel,lgm-pinctrl.yaml        | 114 +++
 drivers/pinctrl/Kconfig                            |  18 +
 drivers/pinctrl/Makefile                           |   1 +
 drivers/pinctrl/pinctrl-equilibrium.c              | 964 +++++++++++++++++++++
 drivers/pinctrl/pinctrl-equilibrium.h              | 141 +++
 5 files changed, 1238 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/intel,lgm-pinctrl.yaml
 create mode 100644 drivers/pinctrl/pinctrl-equilibrium.c
 create mode 100644 drivers/pinctrl/pinctrl-equilibrium.h

-- 
2.11.0

[PATCH v3 1/2] pinctrl: Add pinmux & GPIO controller driver for a new SoC

[Rahul Tanwar]

Intel Lightning Mountain SoC has a pinmux controller & GPIO controller IP which
controls pin multiplexing & configuration including GPIO functions selection &
GPIO attributes configuration.

This IP is not based on & does not have anything in common with Chassis
specification. The pinctrl drivers under pinctrl/intel/* are all based upon
Chassis spec compliant pinctrl IPs. So this driver doesn't fit & can not use
pinctrl framework under pinctrl/intel/* and it requires a separate new driver.

Add a new GPIO & pin control framework based driver for this IP.

Signed-off-by: Rahul Tanwar <rahul.tanwar@linux.intel.com>
---
 drivers/pinctrl/Kconfig               |  18 +
 drivers/pinctrl/Makefile              |   1 +
 drivers/pinctrl/pinctrl-equilibrium.c | 964 ++++++++++++++++++++++++++++++++++
 drivers/pinctrl/pinctrl-equilibrium.h | 141 +++++
 4 files changed, 1124 insertions(+)
 create mode 100644 drivers/pinctrl/pinctrl-equilibrium.c
 create mode 100644 drivers/pinctrl/pinctrl-equilibrium.h

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index b372419d61f2..7809e33c7762 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -420,4 +420,22 @@ config PINCTRL_TB10X
 	depends on OF && ARC_PLAT_TB10X
 	select GPIOLIB
 
+config PINCTRL_EQUILIBRIUM
+	tristate "Generic pinctrl and GPIO driver for Intel Lightning Mountain SoC"
+	select PINMUX
+	select PINCONF
+	select GPIOLIB
+	select GPIO_GENERIC
+	select GPIOLIB_IRQCHIP
+	select GENERIC_PINCONF
+	select GENERIC_PINCTRL_GROUPS
+	select GENERIC_PINMUX_FUNCTIONS
+
+	help
+	  Equilibrium pinctrl driver is a pinctrl & GPIO driver for Intel Lightning
+	  Mountain network processor SoC that supports both the linux GPIO and pin
+	  control frameworks. It provides interfaces to setup pinmux, assign desired
+	  pin functions, configure GPIO attributes for LGM SoC pins. Pinmux and
+	  pinconf settings are retrieved from device tree.
+
 endif
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index ac537fdbc998..879f312bfb75 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -46,6 +46,7 @@ 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_EQUILIBRIUM)   += pinctrl-equilibrium.o
 
 obj-y				+= actions/
 obj-$(CONFIG_ARCH_ASPEED)	+= aspeed/
diff --git a/drivers/pinctrl/pinctrl-equilibrium.c b/drivers/pinctrl/pinctrl-equilibrium.c
new file mode 100644
index 000000000000..bafb1074bc06
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-equilibrium.c
@@ -0,0 +1,964 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2019 Intel Corporation */
+#include <linux/gpio/driver.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/platform_device.h>
+
+#include "core.h"
+#include "pinconf.h"
+#include "pinmux.h"
+#include "pinctrl-equilibrium.h"
+
+#define PIN_NAME_FMT	"io-%d"
+#define PIN_NAME_LEN	10
+#define PAD_REG_OFF	0x100
+
+static void eqbr_set_val(void __iomem *addr, u32 offset,
+			 u32 mask, u32 set, raw_spinlock_t *lock)
+{
+	u32 val;
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(lock, flags);
+	mask = mask << offset;
+	val = readl(addr);
+	val = (val & ~mask) | ((set << offset) & mask);
+	writel(val, addr);
+	raw_spin_unlock_irqrestore(lock, flags);
+}
+
+static void eqbr_gpio_disable_irq(struct irq_data *d)
+{
+	unsigned int offset = irqd_to_hwirq(d);
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct eqbr_gpio_desc *desc = gpiochip_get_data(gc);
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&desc->lock, flags);
+	writel(BIT(offset), desc->membase + GPIO_IRNENCLR);
+	raw_spin_unlock_irqrestore(&desc->lock, flags);
+}
+
+static void eqbr_gpio_enable_irq(struct irq_data *d)
+{
+	unsigned int offset = irqd_to_hwirq(d);
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct eqbr_gpio_desc *desc = gpiochip_get_data(gc);
+	unsigned long flags;
+
+	gc->direction_input(gc, offset);
+	raw_spin_lock_irqsave(&desc->lock, flags);
+	writel(BIT(offset), desc->membase + GPIO_IRNRNSET);
+	raw_spin_unlock_irqrestore(&desc->lock, flags);
+}
+
+static void eqbr_gpio_ack_irq(struct irq_data *d)
+{
+	unsigned int offset = irqd_to_hwirq(d);
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct eqbr_gpio_desc *desc = gpiochip_get_data(gc);
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&desc->lock, flags);
+	writel(BIT(offset), desc->membase + GPIO_IRNCR);
+	raw_spin_unlock_irqrestore(&desc->lock, flags);
+}
+
+static void eqbr_gpio_mask_ack_irq(struct irq_data *d)
+{
+	eqbr_gpio_disable_irq(d);
+	eqbr_gpio_ack_irq(d);
+}
+
+static inline void eqbr_cfg_bit(void __iomem *addr,
+				unsigned int offset, unsigned int set)
+{
+	if (set)
+		writel(readl(addr) | BIT(offset), addr);
+	else
+		writel(readl(addr) & ~BIT(offset), addr);
+}
+
+static int eqbr_irq_type_cfg(struct gpio_irq_type *type,
+			     struct eqbr_gpio_desc *desc,
+			     unsigned int offset)
+{
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&desc->lock, flags);
+	eqbr_cfg_bit(desc->membase + GPIO_IRNCFG, offset, type->trig_type);
+	eqbr_cfg_bit(desc->membase + GPIO_EXINTCR1, offset, type->trig_type);
+	eqbr_cfg_bit(desc->membase + GPIO_EXINTCR0, offset, type->logic_type);
+	raw_spin_unlock_irqrestore(&desc->lock, flags);
+
+	return 0;
+}
+
+static int eqbr_gpio_set_irq_type(struct irq_data *d, unsigned int type)
+{
+	unsigned int offset = irqd_to_hwirq(d);
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct eqbr_gpio_desc *desc = gpiochip_get_data(gc);
+	struct gpio_irq_type it;
+
+	memset(&it, 0, sizeof(it));
+
+	if ((type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_NONE)
+		return 0;
+
+	switch (type) {
+	case IRQ_TYPE_EDGE_RISING:
+		it.trig_type = GPIO_EDGE_TRIG;
+		it.edge_type = GPIO_SINGLE_EDGE;
+		it.logic_type = GPIO_POSITIVE_TRIG;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		it.trig_type = GPIO_EDGE_TRIG;
+		it.edge_type = GPIO_SINGLE_EDGE;
+		it.logic_type = GPIO_NEGATIVE_TRIG;
+		break;
+
+	case IRQ_TYPE_EDGE_BOTH:
+		it.trig_type = GPIO_EDGE_TRIG;
+		it.edge_type = GPIO_BOTH_EDGE;
+		it.logic_type = GPIO_POSITIVE_TRIG;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		it.trig_type = GPIO_LEVEL_TRIG;
+		it.edge_type = GPIO_SINGLE_EDGE;
+		it.logic_type = GPIO_POSITIVE_TRIG;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		it.trig_type = GPIO_LEVEL_TRIG;
+		it.edge_type = GPIO_SINGLE_EDGE;
+		it.logic_type = GPIO_NEGATIVE_TRIG;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	eqbr_irq_type_cfg(&it, desc, offset);
+	if (it.trig_type == GPIO_EDGE_TRIG)
+		irq_set_handler_locked(d, handle_edge_irq);
+	else
+		irq_set_handler_locked(d, handle_level_irq);
+
+	return 0;
+}
+
+static void eqbr_irq_handler(struct irq_desc *desc)
+{
+	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
+	struct eqbr_gpio_desc *gpio_desc = gpiochip_get_data(gc);
+	struct irq_chip *ic = irq_desc_get_chip(desc);
+	unsigned long pins, offset;
+
+	chained_irq_enter(ic, desc);
+	pins = readl(gpio_desc->membase + GPIO_IRNCR);
+
+	for_each_set_bit(offset, &pins, gc->ngpio)
+		generic_handle_irq(irq_find_mapping(gc->irq.domain, offset));
+
+	chained_irq_exit(ic, desc);
+}
+
+static int gpiochip_setup(struct device *dev, struct eqbr_gpio_desc *desc)
+{
+	struct gpio_irq_chip *girq;
+	struct gpio_chip *gc;
+
+	gc = &desc->chip;
+	gc->label = desc->name;
+#if defined(CONFIG_OF_GPIO)
+	gc->of_node = desc->node;
+#endif
+
+	if (!of_property_read_bool(desc->node, "interrupt-controller")) {
+		dev_info(dev, "gc %s: doesn't act as interrupt controller!\n",
+			 desc->name);
+		return 0;
+	}
+
+	desc->ic.name = "gpio_irq";
+	desc->ic.irq_mask = eqbr_gpio_disable_irq;
+	desc->ic.irq_unmask = eqbr_gpio_enable_irq;
+	desc->ic.irq_ack = eqbr_gpio_ack_irq;
+	desc->ic.irq_mask_ack = eqbr_gpio_mask_ack_irq;
+	desc->ic.irq_set_type = eqbr_gpio_set_irq_type;
+
+	girq = &desc->chip.irq;
+	girq->chip = &desc->ic;
+	girq->parent_handler = eqbr_irq_handler;
+	girq->num_parents = 1;
+	girq->parents = devm_kcalloc(dev, 1, sizeof(*girq->parents), GFP_KERNEL);
+	if (!girq->parents)
+		return -ENOMEM;
+
+	girq->default_type = IRQ_TYPE_NONE;
+	girq->handler = handle_bad_irq;
+	girq->parents[0] = desc->virq;
+
+	return 0;
+}
+
+static int gpiolib_reg(struct eqbr_pinctrl_drv_data *drvdata)
+{
+	struct device_node *np;
+	struct eqbr_gpio_desc *desc;
+	struct device *dev;
+	int i, ret;
+	struct resource res;
+
+	dev = drvdata->dev;
+	for (i = 0; i < drvdata->nr_gpio_descs; i++) {
+		desc = drvdata->gpio_desc + i;
+		np = desc->node;
+
+		desc->name = devm_kasprintf(dev, GFP_KERNEL, "gpiochip%d", i);
+		if (!desc->name)
+			return -ENOMEM;
+
+		if (of_address_to_resource(np, 0, &res)) {
+			dev_err(dev, "Failed to get GPIO register address\n");
+			return -ENXIO;
+		}
+
+		desc->membase = devm_ioremap_resource(dev, &res);
+		if (IS_ERR(desc->membase))
+			return PTR_ERR(desc->membase);
+
+		desc->virq = irq_of_parse_and_map(np, 0);
+		if (!desc->virq) {
+			dev_err(dev, "%s: failed to parse and map irq\n",
+				desc->name);
+			return -ENXIO;
+		}
+		raw_spin_lock_init(&desc->lock);
+
+		ret = bgpio_init(&desc->chip, dev, desc->bank->nr_pins/8,
+				 desc->membase + GPIO_IN,
+				 desc->membase + GPIO_OUTSET,
+				 desc->membase + GPIO_OUTCLR,
+				 desc->membase + GPIO_DIR,
+				 NULL,
+				 0);
+		if (ret) {
+			dev_err(dev, "unable to init generic GPIO\n");
+			return ret;
+		}
+
+		ret = gpiochip_setup(dev, desc);
+		if (ret)
+			return ret;
+
+		ret = devm_gpiochip_add_data(dev, &desc->chip, desc);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static inline struct eqbr_pin_bank
+*find_pinbank_via_pin(struct eqbr_pinctrl_drv_data *pctl, unsigned int pin)
+{
+	int i;
+	struct eqbr_pin_bank *bank;
+
+	for (i = 0; i < pctl->nr_banks; i++) {
+		bank = &pctl->pin_banks[i];
+		if (pin >= bank->pin_base &&
+		    (pin - bank->pin_base) < bank->nr_pins)
+			return bank;
+	}
+
+	return NULL;
+}
+
+static const struct pinctrl_ops eqbr_pctl_ops = {
+	.get_groups_count	= pinctrl_generic_get_group_count,
+	.get_group_name		= pinctrl_generic_get_group_name,
+	.get_group_pins		= pinctrl_generic_get_group_pins,
+	.dt_node_to_map		= pinconf_generic_dt_node_to_map_all,
+	.dt_free_map		= pinconf_generic_dt_free_map,
+};
+
+static int eqbr_set_pin_mux(struct eqbr_pinctrl_drv_data *pctl,
+			    unsigned int pmx, unsigned int pin)
+{
+	void __iomem *mem;
+	struct eqbr_pin_bank *bank;
+	unsigned int offset;
+
+	bank = find_pinbank_via_pin(pctl, pin);
+	if (!bank) {
+		dev_err(pctl->dev, "Couldn't find pin bank for pin %u\n", pin);
+		return -ENODEV;
+	}
+	mem = bank->membase;
+	offset = pin - bank->pin_base;
+
+	if (!(bank->aval_pinmap & BIT(offset))) {
+		dev_err(pctl->dev,
+			"PIN: %u is not valid, pinbase: %u, bitmap: %u\n",
+			pin, bank->pin_base, bank->aval_pinmap);
+		return -ENODEV;
+	}
+
+	writel(pmx, mem + (offset << 2));
+	return 0;
+}
+
+static int eqbr_pinmux_set_mux(struct pinctrl_dev *pctldev,
+			       unsigned int selector, unsigned int group)
+{
+	struct eqbr_pinctrl_drv_data *pctl = pinctrl_dev_get_drvdata(pctldev);
+	struct function_desc *func;
+	struct group_desc *grp;
+	unsigned int *pinmux;
+	int i;
+
+	func = pinmux_generic_get_function(pctldev, selector);
+	if (!func)
+		return -EINVAL;
+
+	grp = pinctrl_generic_get_group(pctldev, group);
+	if (!grp)
+		return -EINVAL;
+
+	pinmux = grp->data;
+	for (i = 0; i < grp->num_pins; i++)
+		eqbr_set_pin_mux(pctl, pinmux[i], grp->pins[i]);
+
+	return 0;
+}
+
+static int eqbr_pinmux_gpio_request(struct pinctrl_dev *pctldev,
+				    struct pinctrl_gpio_range *range,
+				    unsigned int pin)
+{
+	struct eqbr_pinctrl_drv_data *pctl = pinctrl_dev_get_drvdata(pctldev);
+
+	/* 0 mux is reserved for GPIO */
+	return eqbr_set_pin_mux(pctl, 0, pin);
+}
+
+static const struct pinmux_ops eqbr_pinmux_ops = {
+	.get_functions_count	= pinmux_generic_get_function_count,
+	.get_function_name	= pinmux_generic_get_function_name,
+	.get_function_groups	= pinmux_generic_get_function_groups,
+	.set_mux		= eqbr_pinmux_set_mux,
+	.gpio_request_enable	= eqbr_pinmux_gpio_request,
+	.strict			= true,
+};
+
+static void set_drv_cur(void __iomem *mem, unsigned int offset,
+			unsigned int set, raw_spinlock_t *lock)
+{
+	unsigned int idx = offset / DRV_CUR_PINS; /* 16 pin per register*/
+	unsigned int reg;
+
+	offset %= DRV_CUR_PINS;
+	reg = REG_DRCC(idx);
+	eqbr_set_val(mem + REG_DRCC(idx), offset * 2, 0x3, set, lock);
+}
+
+static int get_drv_cur(void __iomem *mem, unsigned int offset)
+{
+	unsigned int idx = offset / DRV_CUR_PINS; /* 0-15, 16-31 per register*/
+	unsigned int val;
+
+	val = readl(mem + REG_DRCC(idx));
+	offset %= DRV_CUR_PINS;
+	val = PARSE_DRV_CURRENT(val, offset);
+
+	return val;
+}
+
+static struct eqbr_gpio_desc
+*get_gpio_desc_via_bank(struct eqbr_pinctrl_drv_data *pctl,
+			struct eqbr_pin_bank *bank)
+{
+	int i;
+
+	for (i = 0; i < pctl->nr_gpio_descs; i++) {
+		if (pctl->gpio_desc[i].bank == bank)
+			return &pctl->gpio_desc[i];
+	}
+
+	return NULL;
+}
+
+static int eqbr_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
+			    unsigned long *config)
+{
+	struct eqbr_pinctrl_drv_data *pctl = pinctrl_dev_get_drvdata(pctldev);
+	enum pin_config_param param = pinconf_to_config_param(*config);
+	struct eqbr_pin_bank *bank;
+	unsigned int offset;
+	void __iomem *mem;
+	struct eqbr_gpio_desc *gpio;
+	u32 val;
+
+	bank = find_pinbank_via_pin(pctl, pin);
+	if (!bank) {
+		dev_err(pctl->dev, "Couldn't find pin bank for pin %u\n", pin);
+		return -ENODEV;
+	}
+	mem = bank->membase;
+	offset = pin - bank->pin_base;
+
+	if (!(bank->aval_pinmap & BIT(offset))) {
+		dev_err(pctl->dev,
+			"PIN: %u is not valid, pinbase: %u, bitmap: %u\n",
+			pin, bank->pin_base, bank->aval_pinmap);
+		return -ENODEV;
+	}
+
+	switch (param) {
+	case PIN_CONFIG_BIAS_PULL_UP:
+		val = !!(readl(mem + REG_PUEN) & BIT(offset));
+		break;
+	case PIN_CONFIG_BIAS_PULL_DOWN:
+		val = !!(readl(mem + REG_PDEN) & BIT(offset));
+		break;
+	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+		val = !!(readl(mem + REG_OD) & BIT(offset));
+		break;
+	case PIN_CONFIG_DRIVE_STRENGTH:
+		val = get_drv_cur(mem, offset);
+		break;
+	case PIN_CONFIG_SLEW_RATE:
+		val = !!(readl(mem + REG_SRC) & BIT(offset));
+		break;
+	case PIN_CONFIG_OUTPUT_ENABLE:
+		gpio = get_gpio_desc_via_bank(pctl, bank);
+		if (!gpio) {
+			dev_err(pctl->dev, "Failed to find gpio via bank pinbase: %u, pin: %u\n",
+				bank->pin_base, pin);
+			return -ENODEV;
+		}
+		val = !!(readl(gpio->membase + GPIO_DIR) & BIT(offset));
+		break;
+	default:
+		return -ENOTSUPP;
+	}
+
+	*config = pinconf_to_config_packed(param, val);
+;
+	return 0;
+}
+
+static int eqbr_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
+			    unsigned long *configs, unsigned int num_configs)
+{
+	struct eqbr_pinctrl_drv_data *pctl = pinctrl_dev_get_drvdata(pctldev);
+	enum pin_config_param param;
+	unsigned int val, offset;
+	struct eqbr_pin_bank *bank;
+	struct eqbr_gpio_desc *gpio;
+	struct gpio_chip *gc;
+	void __iomem *mem;
+	int i;
+
+	for (i = 0; i < num_configs; i++) {
+		param = pinconf_to_config_param(configs[i]);
+		val = pinconf_to_config_argument(configs[i]);
+
+		bank = find_pinbank_via_pin(pctl, pin);
+		if (!bank) {
+			dev_err(pctl->dev,
+				"Couldn't find pin bank for pin %u\n", pin);
+			return -ENODEV;
+		}
+		mem = bank->membase;
+		offset = pin - bank->pin_base;
+
+		switch (param) {
+		case PIN_CONFIG_BIAS_PULL_UP:
+			eqbr_set_val(mem + REG_PUEN, offset, 1, val, &pctl->lock);
+			break;
+		case PIN_CONFIG_BIAS_PULL_DOWN:
+			eqbr_set_val(mem + REG_PDEN, offset, 1, val, &pctl->lock);
+			break;
+		case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+			eqbr_set_val(mem + REG_OD, offset, 1, val, &pctl->lock);
+			break;
+		case PIN_CONFIG_DRIVE_STRENGTH:
+			set_drv_cur(mem, offset, val, &pctl->lock);
+			break;
+		case PIN_CONFIG_SLEW_RATE:
+			eqbr_set_val(mem + REG_SRC, offset, 1, val, &pctl->lock);
+			break;
+		case PIN_CONFIG_OUTPUT_ENABLE:
+			gpio = get_gpio_desc_via_bank(pctl, bank);
+			if (!gpio) {
+				dev_err(pctl->dev, "Failed to find gpio via bank pinbase: %u, pin: %u\n",
+					bank->pin_base, pin);
+				return -ENODEV;
+			}
+			gc = &gpio->chip;
+			gc->direction_output(gc, offset, 0);
+			break;
+		default:
+			return -ENOTSUPP;
+		}
+	}
+
+	return 0;
+}
+
+static int eqbr_pinconf_group_get(struct pinctrl_dev *pctldev,
+				  unsigned int group, unsigned long *config)
+{
+	const unsigned int *pins;
+	unsigned int i, npins, old = 0;
+	int ret;
+
+	ret = pinctrl_generic_get_group_pins(pctldev, group, &pins, &npins);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < npins; i++) {
+		if (eqbr_pinconf_get(pctldev, pins[i], config))
+			return -ENOTSUPP;
+
+		if (i && old != *config)
+			return -ENOTSUPP;
+
+		old = *config;
+	}
+	return 0;
+}
+
+static int eqbr_pinconf_group_set(struct pinctrl_dev *pctldev,
+				  unsigned int group, unsigned long *configs,
+				  unsigned int num_configs)
+{
+	const unsigned int *pins;
+	unsigned int i, npins;
+	int ret;
+
+	ret = pinctrl_generic_get_group_pins(pctldev, group, &pins, &npins);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < npins; i++) {
+		ret = eqbr_pinconf_set(pctldev, pins[i], configs, num_configs);
+		if (ret)
+			return ret;
+	}
+	return 0;
+}
+
+static const struct pinconf_ops eqbr_pinconf_ops = {
+	.is_generic			= true,
+	.pin_config_get			= eqbr_pinconf_get,
+	.pin_config_set			= eqbr_pinconf_set,
+	.pin_config_group_get		= eqbr_pinconf_group_get,
+	.pin_config_group_set		= eqbr_pinconf_group_set,
+	.pin_config_config_dbg_show	= pinconf_generic_dump_config,
+};
+
+static int is_func_exist(struct eqbr_pmx_func *funcs, const char *name,
+			 unsigned int nr_funcs, unsigned int *idx)
+{
+	int i;
+
+	if (!funcs || !nr_funcs)
+		return 0;
+
+	for (i = 0; i < nr_funcs; i++) {
+
+		if (funcs[i].name && (strcmp(funcs[i].name, name) == 0) ) {
+			*idx = i;
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+static int funcs_utils(struct device *dev, struct eqbr_pmx_func *funcs,
+		       unsigned int *nr_funcs, funcs_util_ops op)
+{
+	struct device_node *node = dev->of_node;
+	struct device_node *np;
+	struct property *prop;
+	unsigned int fid;
+	const char *fn_name;
+	int i, j;
+
+	i = 0;
+	for_each_child_of_node(node, np) {
+		prop = of_find_property(np, "groups", NULL);
+		if (prop) {
+			if (of_property_read_string(np, "function",
+						    &fn_name)) {
+				/* some groups may not have function, it's OK */
+				dev_dbg(dev, "Group %s: not function binded!\n",
+					(char *)prop->value);
+				continue;
+			}
+
+			switch (op) {
+				case OP_COUNT_NR_FUNCS:
+					if (!is_func_exist(funcs, fn_name,
+							   *nr_funcs, &fid))
+						*nr_funcs = *nr_funcs + 1;
+					break;
+
+				case OP_ADD_FUNCS:
+					if (!is_func_exist(funcs, fn_name,
+							   *nr_funcs, &fid))
+						funcs[i].name = fn_name;
+					break;
+
+				case OP_COUNT_NR_FUNC_GRPS:
+					if (is_func_exist(funcs, fn_name,
+							  *nr_funcs, &fid))
+						funcs[fid].nr_groups++;
+					break;
+
+				case OP_ADD_FUNC_GRPS:
+					if (is_func_exist(funcs, fn_name,
+							  *nr_funcs, &fid)) {
+						for(j=0;
+						    j < funcs[fid].nr_groups;
+						    j++) {
+							if (!funcs[fid].groups[j])
+								break;
+						}
+						funcs[fid].groups[j] = prop->value;
+					}
+					break;
+
+				default:
+					return -EINVAL;
+
+			}
+			i++;
+		}
+	}
+
+	return 0;
+}
+
+static int eqbr_build_functions(struct eqbr_pinctrl_drv_data *drvdata)
+{
+	struct device *dev = drvdata->dev;
+	unsigned int nr_funcs = 0;
+	struct eqbr_pmx_func *funcs = NULL;
+	int i, ret;
+
+	ret = funcs_utils(dev, funcs, &nr_funcs, OP_COUNT_NR_FUNCS);
+	if (ret)
+		return ret;
+
+	funcs = devm_kcalloc(dev, nr_funcs, sizeof(*funcs), GFP_KERNEL);
+	if (!funcs)
+		return -ENOMEM;
+
+	ret = funcs_utils(dev, funcs, &nr_funcs, OP_ADD_FUNCS);
+	if (ret)
+		return ret;
+
+	ret = funcs_utils(dev, funcs, &nr_funcs, OP_COUNT_NR_FUNC_GRPS);
+	if (ret)
+		return ret;
+
+	for (i=0; i < nr_funcs; i++) {
+		if (funcs[i].nr_groups) {
+			funcs[i].groups = devm_kcalloc(dev, funcs[i].nr_groups,
+						       sizeof(*(funcs[i].groups)),
+						       GFP_KERNEL);
+			if (!funcs[i].groups)
+				return -ENOMEM;
+		}
+	}
+
+	ret = funcs_utils(dev, funcs, &nr_funcs, OP_ADD_FUNC_GRPS);
+	if (ret)
+		return ret;
+
+	for (i=0; i < nr_funcs; i++) {
+		ret = pinmux_generic_add_function(drvdata->pctl_dev,
+						  funcs[i].name,
+						  funcs[i].groups,
+						  funcs[i].nr_groups,
+						  drvdata);
+		if (ret < 0) {
+			dev_err(dev, "Failed to register function %s\n",
+				funcs[i].name);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int eqbr_build_groups(struct eqbr_pinctrl_drv_data *drvdata)
+{
+	struct device *dev = drvdata->dev;
+	struct device_node *node = dev->of_node;
+	struct device_node *np;
+	struct property *prop;
+	int j, err;
+	unsigned int *pinmux, pin_id, pinmux_id;
+	struct group_desc group;
+
+	for_each_child_of_node(node, np) {
+		prop = of_find_property(np, "groups", NULL);
+		if (prop) {
+			group.num_pins = of_property_count_u32_elems(np, "pins");
+			if (group.num_pins < 0) {
+				dev_err(dev, "No pins in the group: %s\n",
+					prop->name);
+				return -EINVAL;
+			}
+			group.name = prop->value;
+			group.pins = devm_kcalloc(dev, group.num_pins,
+						  sizeof(*(group.pins)),
+						  GFP_KERNEL);
+			pinmux = devm_kcalloc(dev, group.num_pins,
+					      sizeof(*pinmux), GFP_KERNEL);
+
+			if (!group.pins || !pinmux)
+				return -ENOMEM;
+			for (j = 0; j < group.num_pins; j++) {
+				if (of_property_read_u32_index(np, "pins",
+							       j, &pin_id)) {
+					dev_err(dev, "Group %s: Read intel pins id failed\n",
+						group.name);
+					return -EINVAL;
+				}
+				if (pin_id >= drvdata->pctl_desc.npins) {
+					dev_err(dev, "Group %s: Invalid pin ID, idx: %d, pin %u\n",
+						group.name, j, pin_id);
+					return -EINVAL;
+				}
+				group.pins[j] = pin_id;
+				if (of_property_read_u32_index(np, "pinmux",
+							       j, &pinmux_id)) {
+					dev_err(dev, "Group %s: Read intel pinmux id failed\n",
+						group.name);
+					return -EINVAL;
+				}
+				pinmux[j] = pinmux_id;
+			}
+
+			err = pinctrl_generic_add_group(drvdata->pctl_dev,
+							group.name, group.pins,
+							group.num_pins,
+							pinmux);
+			if (err < 0) {
+				dev_err(dev, "Failed to register group %s\n",
+					group.name);
+				return err;
+			}
+		}
+		memset(&group, 0, sizeof(group));
+		pinmux = NULL;
+	}
+
+	return 0;
+}
+
+static int pinctrl_reg(struct eqbr_pinctrl_drv_data *drvdata)
+{
+	struct pinctrl_desc *pctl_desc;
+	struct pinctrl_pin_desc *pdesc;
+	struct device *dev;
+	unsigned int nr_pins;
+	char *pin_names;
+	int i, ret;
+
+	dev = drvdata->dev;
+	pctl_desc = &drvdata->pctl_desc;
+	pctl_desc->name = "eqbr-pinctrl";
+	pctl_desc->owner = THIS_MODULE;
+	pctl_desc->pctlops = &eqbr_pctl_ops;
+	pctl_desc->pmxops = &eqbr_pinmux_ops;
+	pctl_desc->confops = &eqbr_pinconf_ops;
+	raw_spin_lock_init(&drvdata->lock);
+
+	for (i = 0, nr_pins = 0; i < drvdata->nr_banks; i++)
+		nr_pins += drvdata->pin_banks[i].nr_pins;
+
+	pdesc = devm_kcalloc(dev, nr_pins, sizeof(*pdesc), GFP_KERNEL);
+	if (!pdesc)
+		return -ENOMEM;
+	pin_names = devm_kcalloc(dev, nr_pins, PIN_NAME_LEN, GFP_KERNEL);
+	if (!pin_names)
+		return -ENOMEM;
+
+	for (i = 0; i < nr_pins; i++) {
+		sprintf(pin_names, PIN_NAME_FMT, i);
+		pdesc[i].number = i;
+		pdesc[i].name = pin_names;
+		pin_names += PIN_NAME_LEN;
+	}
+	pctl_desc->pins = pdesc;
+	pctl_desc->npins = nr_pins;
+	dev_dbg(dev, "pinctrl total pin number: %u\n", nr_pins);
+
+	ret = devm_pinctrl_register_and_init(dev, pctl_desc, drvdata,
+					     &drvdata->pctl_dev);
+	if (ret)
+		return ret;
+
+	ret = eqbr_build_groups(drvdata);
+	if (ret) {
+		dev_err(dev, "Failed to build groups\n");
+		return ret;
+	}
+
+	ret = eqbr_build_functions(drvdata);
+	if (ret) {
+		dev_err(dev, "Failed to build groups\n");
+		return ret;
+	}
+
+	return pinctrl_enable(drvdata->pctl_dev);
+}
+
+static int pinbank_init(struct device_node *np,
+			struct eqbr_pinctrl_drv_data *drvdata,
+			struct eqbr_pin_bank *bank, unsigned int id)
+{
+	struct device *dev = drvdata->dev;
+	struct of_phandle_args spec;
+
+	bank->membase = drvdata->membase + id * PAD_REG_OFF;
+
+	if (of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, 0, &spec)) {
+		dev_err(dev, "gpio-range not available!\n");
+		return -EFAULT;
+	}
+
+	bank->pin_base = spec.args[1];
+	bank->nr_pins = spec.args[2];
+
+	bank->aval_pinmap = readl(bank->membase + REG_AVAIL);
+	bank->id = id;
+
+	dev_dbg(dev, "pinbank id: %d, reg: %px, pinbase: %u, pin number: %u, pinmap: 0x%x\n",
+		id, bank->membase, bank->pin_base,
+		bank->nr_pins, bank->aval_pinmap);
+
+	return 0;
+}
+
+static int pinbank_probe(struct eqbr_pinctrl_drv_data *drvdata)
+{
+	struct device_node *node, *np_gpio;
+	struct eqbr_pin_bank *banks;
+	struct eqbr_gpio_desc *gpio_desc;
+	struct device *dev;
+	int i=0, nr_gpio=0;
+
+	dev = drvdata->dev;
+	node = dev->of_node;
+
+	/* Count gpio bank number */
+	for_each_node_by_name(np_gpio, "gpio") {
+		if (of_device_is_available(np_gpio))
+			nr_gpio++;
+	}
+
+	if (!nr_gpio) {
+		dev_err(dev, "NO pin bank available!\n");
+		return -ENODEV;
+	}
+
+	/* Count pin bank number and gpio controller number */
+	banks = devm_kcalloc(dev, nr_gpio, sizeof(*banks), GFP_KERNEL);
+	if (!banks)
+		return -ENOMEM;
+
+	gpio_desc = devm_kcalloc(dev, nr_gpio, sizeof(*gpio_desc), GFP_KERNEL);
+	if (!gpio_desc)
+		return -ENOMEM;
+
+	dev_dbg(dev, "found %d gpio controller!\n", nr_gpio);
+
+	/* Initialize Pin bank */
+	for_each_node_by_name(np_gpio, "gpio") {
+		if (!of_device_is_available(np_gpio))
+			continue;
+
+		pinbank_init(np_gpio, drvdata, banks + i, i);
+
+		gpio_desc[i].node = np_gpio;
+		gpio_desc[i].bank = banks + i;
+		i++;
+	}
+
+	drvdata->pin_banks = banks;
+	drvdata->nr_banks = nr_gpio;
+	drvdata->gpio_desc = gpio_desc;
+	drvdata->nr_gpio_descs = nr_gpio;
+
+	return 0;
+}
+
+static int eqbr_pinctrl_probe(struct platform_device *pdev)
+{
+	struct eqbr_pinctrl_drv_data *drvdata;
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
+	if (!drvdata)
+		return -ENOMEM;
+
+	drvdata->dev = dev;
+	platform_set_drvdata(pdev, drvdata);
+
+	drvdata->membase = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(drvdata->membase))
+		return PTR_ERR(drvdata->membase);
+
+	ret = pinbank_probe(drvdata);
+	if (ret)
+		return ret;
+
+	ret = pinctrl_reg(drvdata);
+	if (ret)
+		return ret;
+
+	ret = gpiolib_reg(drvdata);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static const struct of_device_id eqbr_pinctrl_dt_match[] = {
+	{ .compatible = "intel,lgm-pinctrl" },
+	{}
+};
+
+static struct platform_driver eqbr_pinctrl_driver = {
+	.probe	= eqbr_pinctrl_probe,
+	.driver = {
+		.name = "eqbr-pinctrl",
+		.of_match_table = eqbr_pinctrl_dt_match,
+	},
+};
+
+module_platform_driver(eqbr_pinctrl_driver);
+
+MODULE_AUTHOR("Zhu Yixin <yixin.zhu@intel.com>, Rahul Tanwar <rahul.tanwar@intel.com>");
+MODULE_DESCRIPTION("Pinctrl Driver for LGM SoC (Equilibrium)");
diff --git a/drivers/pinctrl/pinctrl-equilibrium.h b/drivers/pinctrl/pinctrl-equilibrium.h
new file mode 100644
index 000000000000..1bb92229a186
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-equilibrium.h
@@ -0,0 +1,141 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *  Copyright(c) 2019 Intel Corporation.
+ */
+#ifndef __PINCTRL_EQUILIBRIUM_H
+#define __PINCTRL_EQUILIBRIUM_H
+
+/* PINPAD register offset */
+#define REG_PMX_BASE	0x0	/* Port Multiplexer Control Register */
+#define REG_PUEN	0x80	/* PULL UP Enable Register */
+#define REG_PDEN	0x84	/* PULL DOWN Enable Register */
+#define REG_SRC		0x88	/* Slew Rate Control Register */
+#define REG_DCC0	0x8C	/* Drive Current Control Register 0 */
+#define REG_DCC1	0x90	/* Drive Current Control Register 1 */
+#define REG_OD		0x94	/* Open Drain Enable Register */
+#define REG_AVAIL	0x98	/* Pad Control Availability Register */
+#define DRV_CUR_PINS	16	/* Drive Current pin number per register */
+#define REG_DRCC(x)	(REG_DCC0 + (x) * 4) /* Driver current macro */
+
+/* GPIO register offset */
+#define GPIO_OUT	0x0	/* Data Output Register */
+#define GPIO_IN		0x4	/* Data Input Register */
+#define GPIO_DIR	0x8	/* Direction Register */
+#define GPIO_EXINTCR0	0x18	/* External Interrupt Control Register 0 */
+#define GPIO_EXINTCR1	0x1C	/* External Interrupt Control Register 1 */
+#define GPIO_IRNCR	0x20	/* IRN Capture Register */
+#define GPIO_IRNICR	0x24	/* IRN Interrupt Control Register */
+#define GPIO_IRNEN	0x28	/* IRN Interrupt Enable Register */
+#define GPIO_IRNCFG	0x2C	/* IRN Interrupt Configuration Register */
+#define GPIO_IRNRNSET	0x30	/* IRN Interrupt Enable Set Register */
+#define GPIO_IRNENCLR	0x34	/* IRN Interrupt Enable Clear Register */
+#define GPIO_OUTSET	0x40	/* Output Set Register */
+#define GPIO_OUTCLR	0x44	/* Output Clear Register */
+#define GPIO_DIRSET	0x48	/* Direction Set Register */
+#define GPIO_DIRCLR	0x4C	/* Direction Clear Register */
+
+/* parse given pin's driver current value */
+#define PARSE_DRV_CURRENT(val, pin) (((val) >> ((pin) << 1)) & 0x3)
+
+#define GPIO_EDGE_TRIG		0
+#define GPIO_LEVEL_TRIG		1
+#define GPIO_SINGLE_EDGE	0
+#define GPIO_BOTH_EDGE		1
+#define GPIO_POSITIVE_TRIG	0
+#define GPIO_NEGATIVE_TRIG	1
+
+typedef enum {
+	OP_COUNT_NR_FUNCS,
+	OP_ADD_FUNCS,
+	OP_COUNT_NR_FUNC_GRPS,
+	OP_ADD_FUNC_GRPS,
+	OP_NONE,
+} funcs_util_ops;
+
+/**
+ * struct gpio_irq_type: gpio irq configuration
+ * @trig_type: level trigger or edge trigger
+ * @edge_type: sigle edge or both edge
+ * @logic_type: positive trigger or negative trigger
+ */
+struct gpio_irq_type {
+	unsigned int trig_type;
+	unsigned int edge_type;
+	unsigned int logic_type;
+};
+
+/**
+ * struct eqbr_pmx_func: represent a pin function.
+ * @name: name of the pin function, used to lookup the function.
+ * @groups: one or more names of pin groups that provide this function.
+ * @nr_groups: number of groups included in @groups.
+ */
+struct eqbr_pmx_func {
+	const char		*name;
+	const char		**groups;
+	unsigned int		nr_groups;
+};
+
+/**
+ * struct eqbr_pin_bank: represent a pin bank.
+ * @membase: base address of the pin bank register.
+ * @id: bank id, to idenify the unique bank.
+ * @pin_base: starting pin number of the pin bank.
+ * @nr_pins: number of the pins of the pin bank.
+ * @aval_pinmap: available pin bitmap of the pin bank.
+ */
+struct eqbr_pin_bank {
+	void __iomem		*membase;
+	unsigned int		id;
+	unsigned int		pin_base;
+	unsigned int		nr_pins;
+	u32			aval_pinmap;
+};
+
+/**
+ * struct eqbr_gpio_desc: represent a gpio controller.
+ * @node: device node of gpio controller.
+ * @bank: pointer to corresponding pin bank.
+ * @membase: base address of the gpio controller.
+ * @chip: gpio chip.
+ * @ic:   irq chip.
+ * @name: gpio chip name.
+ * @virq: irq number of the gpio chip to parent's irq domain.
+ * @lock: spin lock to protect gpio register write.
+ */
+struct eqbr_gpio_desc {
+	struct device_node	*node;
+	struct eqbr_pin_bank	*bank;
+	void __iomem		*membase;
+	struct gpio_chip	chip;
+	struct irq_chip		ic;
+	const char		*name;
+	unsigned int		virq;
+	raw_spinlock_t		lock; /* protect gpio register */
+};
+
+/**
+ * struct eqbr_pinctrl_drv_data:
+ * @dev: device instance representing the controller.
+ * @pctl_desc: pin controller descriptor.
+ * @pctl_dev: pin control class device
+ * @membase: base address of pin controller
+ * @pin_banks: list of pin banks of the driver.
+ * @nr_banks: number of pin banks.
+ * @gpio_desc: list of gpio controller descriptor.
+ * @nr_gpio_descs: number of gpio descriptors.
+ * @lock: protect pinctrl register write
+ */
+struct eqbr_pinctrl_drv_data {
+	struct device			*dev;
+	struct pinctrl_desc		pctl_desc;
+	struct pinctrl_dev		*pctl_dev;
+	void __iomem			*membase;
+	struct eqbr_pin_bank		*pin_banks;
+	unsigned int			nr_banks;
+	struct eqbr_gpio_desc		*gpio_desc;
+	unsigned int			nr_gpio_descs;
+	raw_spinlock_t			lock; /* protect pinpad register */
+};
+
+#endif /* __PINCTRL_EQUILIBRIUM_H */
-- 
2.11.0

Re: [PATCH v3 1/2] pinctrl: Add pinmux & GPIO controller driver for a new SoC

[Andy Shevchenko]

On Tue, Nov 05, 2019 at 02:49:42PM +0800, Rahul Tanwar wrote:
> Intel Lightning Mountain SoC has a pinmux controller & GPIO controller IP which
> controls pin multiplexing & configuration including GPIO functions selection &
> GPIO attributes configuration.
> 
> This IP is not based on & does not have anything in common with Chassis
> specification. The pinctrl drivers under pinctrl/intel/* are all based upon
> Chassis spec compliant pinctrl IPs. So this driver doesn't fit & can not use
> pinctrl framework under pinctrl/intel/* and it requires a separate new driver.
> 
> Add a new GPIO & pin control framework based driver for this IP.

> +static void eqbr_set_val(void __iomem *addr, u32 offset,

> +			 u32 mask, u32 set, raw_spinlock_t *lock)

This lock parameter is quite unusual. Can't you supply a pointer to a data
structure which has lock along with MMIO address?

> +{
> +	u32 val;
> +	unsigned long flags;
> +
> +	raw_spin_lock_irqsave(lock, flags);

> +	mask = mask << offset;

Same Q. Why do you need these...

> +	val = readl(addr);

> +	val = (val & ~mask) | ((set << offset) & mask);

...offset shifts? It's unusual.

> +	writel(val, addr);
> +	raw_spin_unlock_irqrestore(lock, flags);
> +}

> +static int gpiochip_setup(struct device *dev, struct eqbr_gpio_desc *desc)
> +{
> +	struct gpio_irq_chip *girq;
> +	struct gpio_chip *gc;

> +#if defined(CONFIG_OF_GPIO)
> +	gc->of_node = desc->node;
> +#endif

Isn't it what GPIO library does for everybody?

> +
> +	if (!of_property_read_bool(desc->node, "interrupt-controller")) {

> +		dev_info(dev, "gc %s: doesn't act as interrupt controller!\n",
> +			 desc->name);

Is it fatal or non-fatal?

> +		return 0;

Ditto.

> +	}

> +}

> +static int gpiolib_reg(struct eqbr_pinctrl_drv_data *drvdata)
> +{
> +	struct device_node *np;

> +	struct eqbr_gpio_desc *desc;

desc is very confusing here, since GPIO library uses this term for GPIO
descriptors.

> +	struct device *dev;
> +	int i, ret;
> +	struct resource res;
> +

> +		ret = bgpio_init(&desc->chip, dev, desc->bank->nr_pins/8,

'nr_pins / 8,'

> +				 desc->membase + GPIO_IN,
> +				 desc->membase + GPIO_OUTSET,
> +				 desc->membase + GPIO_OUTCLR,
> +				 desc->membase + GPIO_DIR,
> +				 NULL,
> +				 0);
> +		if (ret) {
> +			dev_err(dev, "unable to init generic GPIO\n");
> +			return ret;
> +		}

> +	return 0;
> +}

> +static int eqbr_pinmux_set_mux(struct pinctrl_dev *pctldev,
> +			       unsigned int selector, unsigned int group)
> +{
> +	struct eqbr_pinctrl_drv_data *pctl = pinctrl_dev_get_drvdata(pctldev);
> +	struct function_desc *func;
> +	struct group_desc *grp;
> +	unsigned int *pinmux;
> +	int i;


> +	pinmux = grp->data;
> +	for (i = 0; i < grp->num_pins; i++)
> +		eqbr_set_pin_mux(pctl, pinmux[i], grp->pins[i]);

Shouldn't be this part serialized?

Same Q to all similar places. I guess I already mentioned this in previous
review.

> +	return 0;
> +}

> +static int is_func_exist(struct eqbr_pmx_func *funcs, const char *name,

Looks like it better to be boolean.

> +			 unsigned int nr_funcs, unsigned int *idx)
> +{
> +	int i;
> +
> +	if (!funcs || !nr_funcs)
> +		return 0;
> +
> +	for (i = 0; i < nr_funcs; i++) {

> +

Redundant blank line.

> +		if (funcs[i].name && (strcmp(funcs[i].name, name) == 0) ) {
> +			*idx = i;
> +			return 1;
> +		}
> +	}
> +
> +	return 0;
> +}

> +static int funcs_utils(struct device *dev, struct eqbr_pmx_func *funcs,
> +		       unsigned int *nr_funcs, funcs_util_ops op)
> +{
> +	struct device_node *node = dev->of_node;
> +	struct device_node *np;
> +	struct property *prop;
> +	unsigned int fid;
> +	const char *fn_name;
> +	int i, j;
> +
> +	i = 0;
> +	for_each_child_of_node(node, np) {
> +		prop = of_find_property(np, "groups", NULL);

> +		if (prop) {

Why not
		if (!prop)
			continue;
?

> +			if (of_property_read_string(np, "function",
> +						    &fn_name)) {

It's perfectly one line. Perhaps you may need to configure your text editor.

> +			}

> +		}
> +	}
> +
> +	return 0;
> +}

> +	for (i=0; i < nr_funcs; i++) {

The better style is 'i = 0' and so on.
Simple be consistent. Or do everywhere 'i=0; i<nr_func; i++', etc. But remember
that this is for sure will be declined by most of the maintainers.

> +	}

> +static int eqbr_build_groups(struct eqbr_pinctrl_drv_data *drvdata)
> +{
> +	struct device *dev = drvdata->dev;
> +	struct device_node *node = dev->of_node;
> +	struct device_node *np;
> +	struct property *prop;
> +	int j, err;
> +	unsigned int *pinmux, pin_id, pinmux_id;
> +	struct group_desc group;
> +
> +	for_each_child_of_node(node, np) {
> +		prop = of_find_property(np, "groups", NULL);

> +		if (prop) {

	if (!prop)
		continue;

	?

> +		}
> +		memset(&group, 0, sizeof(group));
> +		pinmux = NULL;
> +	}
> +
> +	return 0;
> +}

> +static int pinbank_init(struct device_node *np,
> +			struct eqbr_pinctrl_drv_data *drvdata,
> +			struct eqbr_pin_bank *bank, unsigned int id)
> +{
> +	struct device *dev = drvdata->dev;
> +	struct of_phandle_args spec;
> +
> +	bank->membase = drvdata->membase + id * PAD_REG_OFF;
> +

> +	if (of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, 0, &spec)) {
> +		dev_err(dev, "gpio-range not available!\n");

> +		return -EFAULT;

Shadowing error code with actually unsuitable one.

> +	}

> +	return 0;
> +}

> +	int i=0, nr_gpio=0;

Style.
Besides the fact that better to put assignments closer to their usage.

> +static int eqbr_pinctrl_probe(struct platform_device *pdev)
> +{
> +	struct eqbr_pinctrl_drv_data *drvdata;
> +	struct device *dev = &pdev->dev;
> +	int ret;
> +
> +	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
> +	if (!drvdata)
> +		return -ENOMEM;
> +
> +	drvdata->dev = dev;

> +	platform_set_drvdata(pdev, drvdata);

I think this makes sense to do as last call in the function.

> +	drvdata->membase = devm_platform_ioremap_resource(pdev, 0);
> +	if (IS_ERR(drvdata->membase))
> +		return PTR_ERR(drvdata->membase);
> +
> +	ret = pinbank_probe(drvdata);
> +	if (ret)
> +		return ret;
> +
> +	ret = pinctrl_reg(drvdata);
> +	if (ret)
> +		return ret;
> +
> +	ret = gpiolib_reg(drvdata);
> +	if (ret)
> +		return ret;
> +
> +	return 0;
> +}

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v3 1/2] pinctrl: Add pinmux & GPIO controller driver for a new SoC

[Tanwar, Rahul]

On 5/11/2019 5:49 PM, Andy Shevchenko wrote:
> On Tue, Nov 05, 2019 at 02:49:42PM +0800, Rahul Tanwar wrote:
>> Intel Lightning Mountain SoC has a pinmux controller & GPIO controller IP which
>> controls pin multiplexing & configuration including GPIO functions selection &
>> GPIO attributes configuration.
>>
>> This IP is not based on & does not have anything in common with Chassis
>> specification. The pinctrl drivers under pinctrl/intel/* are all based upon
>> Chassis spec compliant pinctrl IPs. So this driver doesn't fit & can not use
>> pinctrl framework under pinctrl/intel/* and it requires a separate new driver.
>>
>> Add a new GPIO & pin control framework based driver for this IP.
>> +static void eqbr_set_val(void __iomem *addr, u32 offset,
>> +			 u32 mask, u32 set, raw_spinlock_t *lock)
> This lock parameter is quite unusual. Can't you supply a pointer to a data
> structure which has lock along with MMIO address?

On second thoughts, i realize that this function can be totally avoided
since it just has two callers which can be further reduced to one caller.
I will remove this function and instead do reg update in the caller function
itself.


>> +static int gpiochip_setup(struct device *dev, struct eqbr_gpio_desc *desc)
>> +{
>> +	struct gpio_irq_chip *girq;
>> +	struct gpio_chip *gc;
>> +#if defined(CONFIG_OF_GPIO)
>> +	gc->of_node = desc->node;
>> +#endif
> Isn't it what GPIO library does for everybody?

We have 4 different of_node's for 4 different gpio_chips/banks. GPIO library
handles like below:

        if (chip->parent) {
                gdev->dev.parent = chip->parent;
                gdev->dev.of_node = chip->parent->of_node;
        }

#ifdef CONFIG_OF_GPIO
        /* If the gpiochip has an assigned OF node this takes precedence */
        if (chip->of_node)
                gdev->dev.of_node = chip->of_node;
        else
                chip->of_node = gdev->dev.of_node;
#endif

So i think we need to assign 4 of_node's to gpio_chip's in the driver.

>> +
>> +	if (!of_property_read_bool(desc->node, "interrupt-controller")) {
>> +		dev_info(dev, "gc %s: doesn't act as interrupt controller!\n",
>> +			 desc->name);
> Is it fatal or non-fatal?

It is not fatal. But i am totally missing your point. Is it about
dev_info() ? Can you please elaborate more ?


>> +		return 0;
> Ditto.
>
>> +	}
>> +}
>> +static int gpiolib_reg(struct eqbr_pinctrl_drv_data *drvdata)
>> +{
>> +	struct device_node *np;
>> +	struct eqbr_gpio_desc *desc;
> desc is very confusing here, since GPIO library uses this term for GPIO
> descriptors.

Agree, better to rename it to avoid confusion with GPIO descriptors.
I will rename it in v4. Thanks.

>> +	struct device *dev;
>> +	int i, ret;
>> +	struct resource res;
>> +
>> +		ret = bgpio_init(&desc->chip, dev, desc->bank->nr_pins/8,
> 'nr_pins / 8,'

Well noted.

>> +				 desc->membase + GPIO_IN,
>> +				 desc->membase + GPIO_OUTSET,
>> +				 desc->membase + GPIO_OUTCLR,
>> +				 desc->membase + GPIO_DIR,
>> +				 NULL,
>> +				 0);
>> +		if (ret) {
>> +			dev_err(dev, "unable to init generic GPIO\n");
>> +			return ret;
>> +		}
>> +	return 0;
>> +}
>> +static int eqbr_pinmux_set_mux(struct pinctrl_dev *pctldev,
>> +			       unsigned int selector, unsigned int group)
>> +{
>> +	struct eqbr_pinctrl_drv_data *pctl = pinctrl_dev_get_drvdata(pctldev);
>> +	struct function_desc *func;
>> +	struct group_desc *grp;
>> +	unsigned int *pinmux;
>> +	int i;
>
>> +	pinmux = grp->data;
>> +	for (i = 0; i < grp->num_pins; i++)
>> +		eqbr_set_pin_mux(pctl, pinmux[i], grp->pins[i]);
> Shouldn't be this part serialized?
>
> Same Q to all similar places. I guess I already mentioned this in previous
> review.

From serialization, you mean locking..rt ? Yes, there is one writel()
statement inthis flow. I will add lock for that statement. Rechecked
the code again, i do notfind any other similar places.


>> +	return 0;
>> +}
>> +static int is_func_exist(struct eqbr_pmx_func *funcs, const char *name,
> Looks like it better to be boolean.

Well noted, will change in v4.

>> +			 unsigned int nr_funcs, unsigned int *idx)
>> +{
>> +	int i;
>> +
>> +	if (!funcs || !nr_funcs)
>> +		return 0;
>> +
>> +	for (i = 0; i < nr_funcs; i++) {
>> +
> Redundant blank line.

Well noted, will change in v4.

>> +		if (funcs[i].name && (strcmp(funcs[i].name, name) == 0) ) {
>> +			*idx = i;
>> +			return 1;
>> +		}
>> +	}
>> +
>> +	return 0;
>> +}
>> +static int funcs_utils(struct device *dev, struct eqbr_pmx_func *funcs,
>> +		       unsigned int *nr_funcs, funcs_util_ops op)
>> +{
>> +	struct device_node *node = dev->of_node;
>> +	struct device_node *np;
>> +	struct property *prop;
>> +	unsigned int fid;
>> +	const char *fn_name;
>> +	int i, j;
>> +
>> +	i = 0;
>> +	for_each_child_of_node(node, np) {
>> +		prop = of_find_property(np, "groups", NULL);
>> +		if (prop) {
> Why not
> 		if (!prop)
> 			continue;
> ?

Sure, i can change like that in v4.

>> +			if (of_property_read_string(np, "function",
>> +						    &fn_name)) {
> It's perfectly one line. Perhaps you may need to configure your text editor.

I am following strict 80 chars limit. This goes on to 81 chars. It's a bit
confusing on when to adhere to 80 chars limit and when to bypass it :)

>> +			}
>> +		}
>> +	}
>> +
>> +	return 0;
>> +}
>> +	for (i=0; i < nr_funcs; i++) {
> The better style is 'i = 0' and so on.
> Simple be consistent. Or do everywhere 'i=0; i<nr_func; i++', etc. But remember
> that this is for sure will be declined by most of the maintainers.

Sure, noted.

>> +	}
>>
>> +static int pinbank_init(struct device_node *np,
>> +			struct eqbr_pinctrl_drv_data *drvdata,
>> +			struct eqbr_pin_bank *bank, unsigned int id)
>> +{
>> +	struct device *dev = drvdata->dev;
>> +	struct of_phandle_args spec;
>> +
>> +	bank->membase = drvdata->membase + id * PAD_REG_OFF;
>> +
>> +	if (of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, 0, &spec)) {
>> +		dev_err(dev, "gpio-range not available!\n");
>> +		return -EFAULT;
> Shadowing error code with actually unsuitable one.

Will change in v4. Thanks.

Regards,
Rahul

Re: [PATCH v3 1/2] pinctrl: Add pinmux & GPIO controller driver for a new SoC

[Andy Shevchenko]

On Tue, Nov 05, 2019 at 06:52:52PM +0800, Tanwar, Rahul wrote:
> On 5/11/2019 5:49 PM, Andy Shevchenko wrote:
> > On Tue, Nov 05, 2019 at 02:49:42PM +0800, Rahul Tanwar wrote:

> >> +static void eqbr_set_val(void __iomem *addr, u32 offset,
> >> +			 u32 mask, u32 set, raw_spinlock_t *lock)
> > This lock parameter is quite unusual. Can't you supply a pointer to a data
> > structure which has lock along with MMIO address?
> 
> On second thoughts, i realize that this function can be totally avoided
> since it just has two callers which can be further reduced to one caller.
> I will remove this function and instead do reg update in the caller function
> itself.

Good.

> >> +static int gpiochip_setup(struct device *dev, struct eqbr_gpio_desc *desc)
> >> +{
> >> +	struct gpio_irq_chip *girq;
> >> +	struct gpio_chip *gc;
> >> +#if defined(CONFIG_OF_GPIO)
> >> +	gc->of_node = desc->node;
> >> +#endif
> > Isn't it what GPIO library does for everybody?
> 
> We have 4 different of_node's for 4 different gpio_chips/banks. GPIO library
> handles like below:
> 
>         if (chip->parent) {
>                 gdev->dev.parent = chip->parent;
>                 gdev->dev.of_node = chip->parent->of_node;
>         }
> 
> #ifdef CONFIG_OF_GPIO
>         /* If the gpiochip has an assigned OF node this takes precedence */
>         if (chip->of_node)
>                 gdev->dev.of_node = chip->of_node;
>         else
>                 chip->of_node = gdev->dev.of_node;
> #endif
> 
> So i think we need to assign 4 of_node's to gpio_chip's in the driver.

OK!

> >> +	if (!of_property_read_bool(desc->node, "interrupt-controller")) {
> >> +		dev_info(dev, "gc %s: doesn't act as interrupt controller!\n",
> >> +			 desc->name);
> > Is it fatal or non-fatal?
> 
> It is not fatal. But i am totally missing your point. Is it about
> dev_info() ? Can you please elaborate more ?
> 
> 
> >> +		return 0;
> > Ditto.

> >> +	}

If it's fatal, you have to use dev_err() and return an appropriate error code,
if it's not fatal, switch to dev_warn() in case user has to know that behaviour
may be quite different, while seems to work in general or dev_dbg() if it's
only for the developer. dev_info() with return 0 is quite confusing.

> >> +}

> >> +static int eqbr_pinmux_set_mux(struct pinctrl_dev *pctldev,
> >> +			       unsigned int selector, unsigned int group)
> >> +{
> >> +	struct eqbr_pinctrl_drv_data *pctl = pinctrl_dev_get_drvdata(pctldev);
> >> +	struct function_desc *func;
> >> +	struct group_desc *grp;
> >> +	unsigned int *pinmux;
> >> +	int i;
> >
> >> +	pinmux = grp->data;
> >> +	for (i = 0; i < grp->num_pins; i++)
> >> +		eqbr_set_pin_mux(pctl, pinmux[i], grp->pins[i]);
> > Shouldn't be this part serialized?
> >
> > Same Q to all similar places. I guess I already mentioned this in previous
> > review.
> 
> From serialization, you mean locking..rt ? Yes, there is one writel()
> statement inthis flow. I will add lock for that statement. Rechecked
> the code again, i do notfind any other similar places.

You need to clarify what exactly you are serializing.
When you figure this out, the locking should be done accordingly.

> >> +	return 0;
> >> +}

> >> +			if (of_property_read_string(np, "function",
> >> +						    &fn_name)) {

> > It's perfectly one line. Perhaps you may need to configure your text editor.
> 
> I am following strict 80 chars limit. This goes on to 81 chars. It's a bit
> confusing on when to adhere to 80 chars limit and when to bypass it :)

I have checked again, it's exactly 80 characters.

> >> +			}

-- 
With Best Regards,
Andy Shevchenko

[PATCH v3 2/2] dt-bindings: pinctrl: intel: Add for new SoC

[Rahul Tanwar]

Add dt bindings document for pinmux & GPIO controller driver of
Intel Lightning Mountain SoC.

Signed-off-by: Rahul Tanwar <rahul.tanwar@linux.intel.com>
---
 .../bindings/pinctrl/intel,lgm-pinctrl.yaml        | 114 +++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/intel,lgm-pinctrl.yaml

diff --git a/Documentation/devicetree/bindings/pinctrl/intel,lgm-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/intel,lgm-pinctrl.yaml
new file mode 100644
index 000000000000..961ac877a962
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/intel,lgm-pinctrl.yaml
@@ -0,0 +1,114 @@
+# SPDX-License-Identifier: GPL-2.0-only
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/bindings/pinctrl/intel,lgm-pinctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Intel Lightning Mountain SoC pinmux & GPIO controller binding
+
+maintainers:
+  - Rahul Tanwar <rahul.tanwar@linux.intel.com>
+
+description: |
+  Pinmux & GPIO controller controls pin multiplexing & configuration including
+  GPIO function selection & GPIO attributes configuration.
+
+  Please refer to [1] for details of the common pinctrl bindings used by the
+  client devices.
+
+  [1] Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
+
+properties:
+  compatible:
+    const: intel,lgm-pinctrl
+
+  reg:
+    maxItems: 1
+
+# Client device subnode's properties
+patternProperties:
+  "^.*@[0-9a-fA-F]+$":
+    type: object
+    description:
+      Pinctrl node's client devices use subnodes for desired pin configuration.
+      Client device subnodes use below standard properties.
+
+    properties:
+      function:
+        $ref: /schemas/types.yaml#/definitions/string
+        description:
+          A string containing the name of the function to mux to the group.
+
+      groups:
+        $ref: /schemas/types.yaml#/definitions/string-array
+        description:
+          An array of strings identifying the list of groups.
+
+      pins:
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+        description:
+          List of pins to select with this function.
+
+      pinmux:
+        description: The applicable mux group.
+        allOf:
+          - $ref: "/schemas/types.yaml#/definitions/uint32"
+          - enum:
+              - 0 #PINMUX_GPIO
+              - 1
+              - 2
+              - 3
+              - 4
+
+      bias-pull-up:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: Specifies pull-up configuration.
+
+      bias-pull-down:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: Specifies pull-down configuration.
+
+      drive-strength:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: Enables driver-current.
+
+      slew-rate:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: Enables slew-rate.
+
+      drive-open-drain:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: Specifies open-drain configuration.
+
+      output-enable:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: Specifies if the pin is to be configured as output.
+
+
+    required:
+      - function
+      - groups
+
+required:
+  - compatible
+  - reg
+
+examples:
+  # Pinmux controller node
+  - |
+    pinctrl: pinctrl@e2880000 {
+          compatible = "intel,lgm-pinctrl";
+          reg = <0xe2880000 0x100000>;
+
+          # Client device subnode
+          uart0:uart0 {
+                pins = <64>, /* UART_RX0 */
+                             <65>; /* UART_TX0 */
+                function = "CONSOLE_UART0";
+                pinmux = <1>,
+                         <1>;
+                groups = "CONSOLE_UART0";
+          };
+    };
+
+...
-- 
2.11.0

Re: [PATCH v3 2/2] dt-bindings: pinctrl: intel: Add for new SoC

[Rob Herring]

On Tue, Nov 05, 2019 at 02:49:43PM +0800, Rahul Tanwar wrote:
> Add dt bindings document for pinmux & GPIO controller driver of
> Intel Lightning Mountain SoC.
> 
> Signed-off-by: Rahul Tanwar <rahul.tanwar@linux.intel.com>
> ---
>  .../bindings/pinctrl/intel,lgm-pinctrl.yaml        | 114 +++++++++++++++++++++
>  1 file changed, 114 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pinctrl/intel,lgm-pinctrl.yaml
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/intel,lgm-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/intel,lgm-pinctrl.yaml
> new file mode 100644
> index 000000000000..961ac877a962
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/intel,lgm-pinctrl.yaml
> @@ -0,0 +1,114 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/bindings/pinctrl/intel,lgm-pinctrl.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Intel Lightning Mountain SoC pinmux & GPIO controller binding
> +
> +maintainers:
> +  - Rahul Tanwar <rahul.tanwar@linux.intel.com>
> +
> +description: |
> +  Pinmux & GPIO controller controls pin multiplexing & configuration including
> +  GPIO function selection & GPIO attributes configuration.
> +
> +  Please refer to [1] for details of the common pinctrl bindings used by the
> +  client devices.
> +
> +  [1] Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
> +
> +properties:
> +  compatible:
> +    const: intel,lgm-pinctrl
> +
> +  reg:
> +    maxItems: 1
> +
> +# Client device subnode's properties
> +patternProperties:
> +  "^.*@[0-9a-fA-F]+$":

A unit address is wrong here. Please define some pattern we can match 
on. '-pins$' perhaps.

> +    type: object
> +    description:
> +      Pinctrl node's client devices use subnodes for desired pin configuration.
> +      Client device subnodes use below standard properties.
> +
> +    properties:
> +      function:
> +        $ref: /schemas/types.yaml#/definitions/string
> +        description:
> +          A string containing the name of the function to mux to the group.
> +
> +      groups:
> +        $ref: /schemas/types.yaml#/definitions/string-array
> +        description:
> +          An array of strings identifying the list of groups.
> +
> +      pins:
> +        $ref: /schemas/types.yaml#/definitions/uint32-array
> +        description:
> +          List of pins to select with this function.
> +
> +      pinmux:
> +        description: The applicable mux group.
> +        allOf:
> +          - $ref: "/schemas/types.yaml#/definitions/uint32"
> +          - enum:
> +              - 0 #PINMUX_GPIO
> +              - 1
> +              - 2
> +              - 3
> +              - 4
> +
> +      bias-pull-up:
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        description: Specifies pull-up configuration.

Isn't this boolean?

> +
> +      bias-pull-down:
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        description: Specifies pull-down configuration.

And this?

Though looks like sometimes it has a value? Pull strength I guess.

> +
> +      drive-strength:
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        description: Enables driver-current.
> +
> +      slew-rate:
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        description: Enables slew-rate.
> +
> +      drive-open-drain:
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        description: Specifies open-drain configuration.

boolean?

> +
> +      output-enable:
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        description: Specifies if the pin is to be configured as output.

boolean?

But really, all of these should have a common schema defining the types 
and only put any additional constraints here.

> +
> +
> +    required:
> +      - function
> +      - groups
> +
> +required:
> +  - compatible
> +  - reg

additionalProperties: false

> +
> +examples:
> +  # Pinmux controller node
> +  - |
> +    pinctrl: pinctrl@e2880000 {
> +          compatible = "intel,lgm-pinctrl";
> +          reg = <0xe2880000 0x100000>;
> +
> +          # Client device subnode
> +          uart0:uart0 {

space              ^

> +                pins = <64>, /* UART_RX0 */
> +                             <65>; /* UART_TX0 */
> +                function = "CONSOLE_UART0";
> +                pinmux = <1>,
> +                         <1>;
> +                groups = "CONSOLE_UART0";
> +          };
> +    };
> +
> +...
> -- 
> 2.11.0
> 

Re: [PATCH v3 2/2] dt-bindings: pinctrl: intel: Add for new SoC

[Tanwar, Rahul]

Hi Rob,

Thanks for the feedback.

On 6/11/2019 5:29 AM, Rob Herring wrote:
>> +      bias-pull-up:
>> +        $ref: /schemas/types.yaml#/definitions/uint32
>> +        description: Specifies pull-up configuration.
> Isn't this boolean?
>
>> +
>> +      bias-pull-down:
>> +        $ref: /schemas/types.yaml#/definitions/uint32
>> +        description: Specifies pull-down configuration.
> And this?
>
> Though looks like sometimes it has a value? Pull strength I guess.
>
>> +
>> +      drive-strength:
>> +        $ref: /schemas/types.yaml#/definitions/uint32
>> +        description: Enables driver-current.
>> +
>> +      slew-rate:
>> +        $ref: /schemas/types.yaml#/definitions/uint32
>> +        description: Enables slew-rate.
>> +
>> +      drive-open-drain:
>> +        $ref: /schemas/types.yaml#/definitions/uint32
>> +        description: Specifies open-drain configuration.
> boolean?
>
>> +
>> +      output-enable:
>> +        $ref: /schemas/types.yaml#/definitions/uint32
>> +        description: Specifies if the pin is to be configured as output.
> boolean?
>
> But really, all of these should have a common schema defining the types 
> and only put any additional constraints here.

Yes, you are right. These are all boolean types.
All these are standard properties & we are using them with no
additional constraintsi.e conforming to how they are already
documented in pinctrl-bindings.txt. Shall ijust omit documenting
these properties here in driver bindings ?

>> +
>> +examples:
>> +  # Pinmux controller node
>> +  - |
>> +    pinctrl: pinctrl@e2880000 {
>> +          compatible = "intel,lgm-pinctrl";
>> +          reg = <0xe2880000 0x100000>;
>> +
>> +          # Client device subnode
>> +          uart0:uart0 {
> space              ^

Just to be sure, you mean space misalignment at below
line <65>; /* UART_TX0 */ ?Or is it something else ?

>> +                pins = <64>, /* UART_RX0 */
>> +                             <65>; /* UART_TX0 */
>> +                function = "CONSOLE_UART0";
>> +                pinmux = <1>,
>> +                         <1>;
>> +                groups = "CONSOLE_UART0";
>> +          };
>> +    };
>> +
>> +...
>> -- 
>> 2.11.0
>>
Regards,
Rahul

Re: [PATCH v3 2/2] dt-bindings: pinctrl: intel: Add for new SoC

[Tanwar, Rahul]

On 6/11/2019 6:24 PM, Tanwar, Rahul wrote:
> Hi Rob,
>
> Thanks for the feedback.
>
> On 6/11/2019 5:29 AM, Rob Herring wrote:
>>> +      bias-pull-up:
>>> +        $ref: /schemas/types.yaml#/definitions/uint32
>>> +        description: Specifies pull-up configuration.
>> Isn't this boolean?
>>
>>> +
>>> +      bias-pull-down:
>>> +        $ref: /schemas/types.yaml#/definitions/uint32
>>> +        description: Specifies pull-down configuration.
>> And this?
>>
>> Though looks like sometimes it has a value? Pull strength I guess.
>>
>>> +
>>> +      drive-strength:
>>> +        $ref: /schemas/types.yaml#/definitions/uint32
>>> +        description: Enables driver-current.
>>> +
>>> +      slew-rate:
>>> +        $ref: /schemas/types.yaml#/definitions/uint32
>>> +        description: Enables slew-rate.
>>> +
>>> +      drive-open-drain:
>>> +        $ref: /schemas/types.yaml#/definitions/uint32
>>> +        description: Specifies open-drain configuration.
>> boolean?
>>
>>> +
>>> +      output-enable:
>>> +        $ref: /schemas/types.yaml#/definitions/uint32
>>> +        description: Specifies if the pin is to be configured as output.
>> boolean?
>>
>> But really, all of these should have a common schema defining the types 
>> and only put any additional constraints here.
> Yes, you are right. These are all boolean types.
> All these are standard properties & we are using them with no
> additional constraintsi.e conforming to how they are already
> documented in pinctrl-bindings.txt. Shall ijust omit documenting
> these properties here in driver bindings ?
>
>>> +
>>> +examples:
>>> +  # Pinmux controller node
>>> +  - |
>>> +    pinctrl: pinctrl@e2880000 {
>>> +          compatible = "intel,lgm-pinctrl";
>>> +          reg = <0xe2880000 0x100000>;
>>> +
>>> +          # Client device subnode
>>> +          uart0:uart0 {
>> space              ^
> Just to be sure, you mean space misalignment at below
> line <65>; /* UART_TX0 */ ?Or is it something else ?

Please ignore this query of mine. I now realize  that you meant space
between alias name & node name i.e. uart0: uart0 {. I will fix it in
nextpatch version. Thanks.

>>> +                pins = <64>, /* UART_RX0 */
>>> +                             <65>; /* UART_TX0 */
>>> +                function = "CONSOLE_UART0";
>>> +                pinmux = <1>,
>>> +                         <1>;
>>> +                groups = "CONSOLE_UART0";
>>> +          };
>>> +    };
>>> +
>>> +...
>>> -- 
>>> 2.11.0
>>>
> Regards,
> Rahul

Re: [PATCH v3 0/2] pinctrl: Add new pinctrl/GPIO driver

[Linus Walleij]

On Tue, Nov 5, 2019 at 7:49 AM Rahul Tanwar
<rahul.tanwar@linux.intel.com> wrote:

> This series is to add pinctrl & GPIO controller driver for a new SoC.
> Patch 1 adds pinmux & GPIO controller driver.
> Patch 2 adds the corresponding dt bindings YAML document.
>
> Patches are against Linux 5.4-rc1 at below Git tree:
> git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl.git
>
> v3:
> - Add locking for GPIO IRQ ops.
> - Fix property naming mistake in dt bindings document.
> - Address other code quality related review concerns.
> - Fix a build error reported by kbuild test robot.
> - Remove deleted structure fields from comments.

This version looks perfectly acceptable to me, any remaining nits
can surely be fixed-up in-tree.

I give the other reviewers some days to consider it and then I
will merge it for v5.5.

Yours,
Linus Walleij