diff mbox series

[3/3] pinctrl: actions: Add interrupt support for OWL S900 SoC

Message ID 20180602165415.30956-4-manivannan.sadhasivam@linaro.org
State New
Headers show
Series Add gpio interrupt support for Actions Semi S900 SoC | expand

Commit Message

Manivannan Sadhasivam June 2, 2018, 4:54 p.m. UTC 
Add interrupt support for Actions Semi OWL S900 SoC.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

---
 drivers/pinctrl/actions/Kconfig        |   1 +
 drivers/pinctrl/actions/pinctrl-owl.c  | 231 ++++++++++++++++++++++++-
 drivers/pinctrl/actions/pinctrl-owl.h  |  22 ++-
 drivers/pinctrl/actions/pinctrl-s900.c |  31 ++--
 4 files changed, 267 insertions(+), 18 deletions(-)

-- 
2.17.0

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Comments

Manivannan Sadhasivam June 3, 2018, 4:57 p.m. UTC | #1 
Hi Andy,

On Sun, Jun 03, 2018 at 11:37:53AM +0300, Andy Shevchenko wrote:
> On Sat, Jun 2, 2018 at 7:54 PM, Manivannan Sadhasivam

> <manivannan.sadhasivam@linaro.org> wrote:

> > Add interrupt support for Actions Semi OWL S900 SoC.

> 

> > +       port = owl_gpio_get_port(pctrl, &gpio);

> > +       if (WARN_ON(port == NULL))

> > +               return;

> 

> At which circumstances the above possible?

> 


Only possible when the requested GPIO exceeds chip->ngpio. I know it is
a kind of redundant check, but it is good to have this during development.

> > +       port = owl_gpio_get_port(pctrl, &gpio);

> > +       if (WARN_ON(port == NULL))

> > +               return;

> 

> Ditto.

>


Same as above.

> > +       port = owl_gpio_get_port(pctrl, &gpio);

> > +       if (WARN_ON(port == NULL))

> > +               return;

> 

> Ditto.

>


Same as above.

> > +       port = owl_gpio_get_port(pctrl, &gpio);

> > +       if (WARN_ON(port == NULL))

> > +               return -ENODEV;

> 

> Ditto.

>


Same as above.

> 

> > +       for (i = 0; i < chip->ngpio; i++) {

> > +               irqno = irq_create_mapping(pctrl->domain, i);

> > +               irq_set_chip_and_handler(irqno, &owl_gpio_irq_chip,

> > +                                        handle_edge_irq);

> > +               irq_set_chip_data(irqno, pctrl);

> > +       }

> 

> I'm not sure the handle_edge_irq() is a correct handler here. It would

> be handle_bad_irq() until IRQ has been requested properly.

> No?

>


Hmmm, good question. Since the handler used in irq_set_chip_and_handler
is superseded by irq_set_chained_handler_and_data, this doesn't matter
anyway. But I would like to hear what Linus suggests here!

> > +/* GPIO TYPE Bit Definition */

> > +#define OWL_GPIO_INT_LEVEL_HIGH                0

> > +#define OWL_GPIO_INT_LEVEL_LOW         1

> > +#define OWL_GPIO_INT_EDGE_RISING       2

> > +#define OWL_GPIO_INT_EDGE_FALLING      3

> 

> > +#define OWL_GPIO_INT_MASK              3

> 

> GENMASK?

>


Ack.

Thanks,
Mani

> -- 

> With Best Regards,

> Andy Shevchenko

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Linus Walleij June 12, 2018, 8:38 a.m. UTC | #2 
On Sat, Jun 2, 2018 at 6:54 PM, Manivannan Sadhasivam
<manivannan.sadhasivam@linaro.org> wrote:

> Add interrupt support for Actions Semi OWL S900 SoC.

>

> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

(...)

> +++ b/drivers/pinctrl/actions/Kconfig

> @@ -5,6 +5,7 @@ config PINCTRL_OWL

>         select PINCONF

>         select GENERIC_PINCONF

>         select GPIOLIB

> +       select GPIOLIB_IRQCHIP


I don't think you're really using that (certain sign: you're implementing
.to_irq().)

GPIOLIB_IRQCHIP is nice, but can only be used when there is
a 1-1 correspondence betweem GPIO line offsets and
IRQ lines and they are numbered 0..n.

However I think you can use it! Look below for my reference
to the tegra186 and how you can probably cut out the custom
irqdomain with some manouvers.

> +       struct owl_pinctrl *pctrl = irq_data_get_irq_chip_data(data);

> +       const struct owl_gpio_port *port;

(...)
> +       unsigned int gpio = data->hwirq;

> +

> +       port = owl_gpio_get_port(pctrl, &gpio);

> +

> +       gpio_base = pctrl->base + port->offset;


It is all about this calculation really.

> +static int owl_gpio_irq_set_type(struct irq_data *data, unsigned int type)

> +{

> +       struct owl_pinctrl *pctrl = irq_data_get_irq_chip_data(data);

> +       const struct owl_gpio_port *port;

> +       void __iomem *gpio_base;

> +       unsigned long flags;

> +       unsigned int gpio = data->hwirq;

> +       unsigned int offset, value, irq_type = 0;

> +

> +       port = owl_gpio_get_port(pctrl, &gpio);

> +       if (WARN_ON(port == NULL))

> +               return -ENODEV;

> +

> +       gpio_base = pctrl->base + port->offset;

> +

> +       switch (type) {

> +       case IRQ_TYPE_EDGE_RISING:

> +               irq_type = OWL_GPIO_INT_EDGE_RISING;

> +               break;

> +

> +       case IRQ_TYPE_EDGE_FALLING:

> +               irq_type = OWL_GPIO_INT_EDGE_FALLING;

> +               break;


Very often things such as keys will request trigger on
both edges. This means IRQ_TYPE_EDGE_RISING
and IRQ_TYPE_EDGE_FALLING are both set, which
will cause you problems here, since it is unhandled.

I guess it is fine to set both?

> +       offset = gpio < 16 ? 4 : 0;


I think even the compiler should suggest putting he (gpio < 16)
expression in paranthesis.

> +       value = readl_relaxed(gpio_base + port->intc_type + offset);

> +       value &= ~(OWL_GPIO_INT_MASK << ((gpio % 16) * 2));

> +       value |= irq_type << ((gpio % 16) * 2);

> +       writel_relaxed(value, gpio_base + port->intc_type + offset);

> +

> +       raw_spin_unlock_irqrestore(&pctrl->lock, flags);

> +

> +       if (type & IRQ_TYPE_EDGE_BOTH)

> +               irq_set_handler_locked(data, handle_edge_irq);

> +       else

> +               irq_set_handler_locked(data, handle_level_irq);


Here you handle both edges, but not in the switch clause.

> +static void owl_gpio_irq_handler(struct irq_desc *desc)


This looks fine.

> +static struct irq_chip owl_gpio_irq_chip = {

> +       .name           = "owlgpio",

> +       .irq_mask       = owl_gpio_irq_mask,

> +       .irq_unmask     = owl_gpio_irq_unmask,

> +       .irq_ack        = owl_gpio_irq_ack,

> +       .irq_set_type   = owl_gpio_irq_set_type,

> +};


If you implement your own irqchip you need to implement
.irq_request_resources and .irq_free_resources locking the GPIO
lines for interrupt, see other drivers that do this or the
gpiolib core code in gpiolib.c.

It would be really neat if you could instead use the
GPIOLIB_IRQCHIP though, but I know it will be a bit tricky
and maybe not possible.

> +       for (i = 0; i < pctrl->soc->nports; i++) {

> +               irq_set_chained_handler_and_data(pctrl->irq[i],

> +                                               owl_gpio_irq_handler,

> +                                               pctrl);

> +       }


If you use GPIOLIB_IRQCHIP with several parent IRQs.
See Thierry's work in drivers/gpio/gpio-tegra186.c for the
only example.

I think that is what you want to do here.

We do want to add helpers in gpiolib to do this in a more
organized and easy-to-use fashion. Patches welcome ;)

Yours,
Linus Walleij
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diff mbox series

Patch

diff --git a/drivers/pinctrl/actions/Kconfig b/drivers/pinctrl/actions/Kconfig
index 490927b4ea76..2397cb0f6011 100644
--- a/drivers/pinctrl/actions/Kconfig
+++ b/drivers/pinctrl/actions/Kconfig
@@ -5,6 +5,7 @@  config PINCTRL_OWL
 	select PINCONF
 	select GENERIC_PINCONF
 	select GPIOLIB
+	select GPIOLIB_IRQCHIP
 	help
 	  Say Y here to enable Actions Semi OWL pinctrl driver
 
diff --git a/drivers/pinctrl/actions/pinctrl-owl.c b/drivers/pinctrl/actions/pinctrl-owl.c
index 76243caa08c6..d40c61caeea3 100644
--- a/drivers/pinctrl/actions/pinctrl-owl.c
+++ b/drivers/pinctrl/actions/pinctrl-owl.c
@@ -45,6 +45,8 @@  struct owl_pinctrl {
 	struct clk *clk;
 	const struct owl_pinctrl_soc_data *soc;
 	void __iomem *base;
+	struct irq_domain *domain;
+	int *irq;
 };
 
 static void owl_update_bits(void __iomem *base, u32 mask, u32 val)
@@ -701,16 +703,193 @@  static int owl_gpio_direction_output(struct gpio_chip *chip,
 	return 0;
 }
 
+static int owl_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
+{
+	struct owl_pinctrl *pctrl = gpiochip_get_data(chip);
+
+	return irq_find_mapping(pctrl->domain, offset);
+}
+
+static void owl_gpio_irq_mask(struct irq_data *data)
+{
+	struct owl_pinctrl *pctrl = irq_data_get_irq_chip_data(data);
+	const struct owl_gpio_port *port;
+	void __iomem *gpio_base;
+	unsigned long flags;
+	unsigned int gpio = data->hwirq;
+	u32 val;
+
+	port = owl_gpio_get_port(pctrl, &gpio);
+	if (WARN_ON(port == NULL))
+		return;
+
+	gpio_base = pctrl->base + port->offset;
+
+	raw_spin_lock_irqsave(&pctrl->lock, flags);
+
+	owl_gpio_update_reg(gpio_base + port->intc_msk, gpio, false);
+
+	/* disable port interrupt if no interrupt pending bit is active */
+	val = readl_relaxed(gpio_base + port->intc_msk);
+	if (val == 0)
+		owl_gpio_update_reg(gpio_base + port->intc_ctl,
+					OWL_GPIO_CTLR_ENABLE, false);
+
+	raw_spin_unlock_irqrestore(&pctrl->lock, flags);
+}
+
+static void owl_gpio_irq_unmask(struct irq_data *data)
+{
+	struct owl_pinctrl *pctrl = irq_data_get_irq_chip_data(data);
+	const struct owl_gpio_port *port;
+	void __iomem *gpio_base;
+	unsigned long flags;
+	unsigned int gpio = data->hwirq;
+	u32 value;
+
+	port = owl_gpio_get_port(pctrl, &gpio);
+	if (WARN_ON(port == NULL))
+		return;
+
+	gpio_base = pctrl->base + port->offset;
+	raw_spin_lock_irqsave(&pctrl->lock, flags);
+
+	/* enable port interrupt */
+	value = readl_relaxed(gpio_base + port->intc_ctl);
+	value |= BIT(OWL_GPIO_CTLR_ENABLE) | BIT(OWL_GPIO_CTLR_SAMPLE_CLK_24M);
+	writel_relaxed(value, gpio_base + port->intc_ctl);
+
+	/* enable GPIO interrupt */
+	owl_gpio_update_reg(gpio_base + port->intc_msk, gpio, true);
+
+	raw_spin_unlock_irqrestore(&pctrl->lock, flags);
+}
+
+static void owl_gpio_irq_ack(struct irq_data *data)
+{
+	struct owl_pinctrl *pctrl = irq_data_get_irq_chip_data(data);
+	const struct owl_gpio_port *port;
+	void __iomem *gpio_base;
+	unsigned long flags;
+	unsigned int gpio = data->hwirq;
+
+	port = owl_gpio_get_port(pctrl, &gpio);
+	if (WARN_ON(port == NULL))
+		return;
+
+	gpio_base = pctrl->base + port->offset;
+
+	raw_spin_lock_irqsave(&pctrl->lock, flags);
+
+	owl_gpio_update_reg(gpio_base + port->intc_ctl,
+				OWL_GPIO_CTLR_PENDING, true);
+
+	raw_spin_unlock_irqrestore(&pctrl->lock, flags);
+}
+
+static int owl_gpio_irq_set_type(struct irq_data *data, unsigned int type)
+{
+	struct owl_pinctrl *pctrl = irq_data_get_irq_chip_data(data);
+	const struct owl_gpio_port *port;
+	void __iomem *gpio_base;
+	unsigned long flags;
+	unsigned int gpio = data->hwirq;
+	unsigned int offset, value, irq_type = 0;
+
+	port = owl_gpio_get_port(pctrl, &gpio);
+	if (WARN_ON(port == NULL))
+		return -ENODEV;
+
+	gpio_base = pctrl->base + port->offset;
+
+	switch (type) {
+	case IRQ_TYPE_EDGE_RISING:
+		irq_type = OWL_GPIO_INT_EDGE_RISING;
+		break;
+
+	case IRQ_TYPE_EDGE_FALLING:
+		irq_type = OWL_GPIO_INT_EDGE_FALLING;
+		break;
+
+	case IRQ_TYPE_LEVEL_HIGH:
+		irq_type = OWL_GPIO_INT_LEVEL_HIGH;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		irq_type = OWL_GPIO_INT_LEVEL_LOW;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	raw_spin_lock_irqsave(&pctrl->lock, flags);
+
+	offset = gpio < 16 ? 4 : 0;
+	value = readl_relaxed(gpio_base + port->intc_type + offset);
+	value &= ~(OWL_GPIO_INT_MASK << ((gpio % 16) * 2));
+	value |= irq_type << ((gpio % 16) * 2);
+	writel_relaxed(value, gpio_base + port->intc_type + offset);
+
+	raw_spin_unlock_irqrestore(&pctrl->lock, flags);
+
+	if (type & IRQ_TYPE_EDGE_BOTH)
+		irq_set_handler_locked(data, handle_edge_irq);
+	else
+		irq_set_handler_locked(data, handle_level_irq);
+
+	return 0;
+}
+
+static void owl_gpio_irq_handler(struct irq_desc *desc)
+{
+	struct owl_pinctrl *pctrl = irq_desc_get_handler_data(desc);
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	const struct owl_gpio_port *port;
+	void __iomem *base;
+	unsigned int pin, irq, offset = 0, i;
+	unsigned long pending_irq;
+
+	chained_irq_enter(chip, desc);
+
+	for (i = 0; i < pctrl->soc->nports; i++) {
+		port = &pctrl->soc->ports[i];
+		base = pctrl->base + port->offset;
+		pending_irq = readl_relaxed(base + port->intc_pd);
+
+		for_each_set_bit(pin, &pending_irq, port->pins) {
+			irq = irq_find_mapping(pctrl->domain, offset + pin);
+			generic_handle_irq(irq);
+
+			/* clear pending interrupt */
+			owl_gpio_update_reg(base + port->intc_pd, pin, true);
+		}
+
+		offset += port->pins;
+	}
+
+	chained_irq_exit(chip, desc);
+}
+
+static struct irq_chip owl_gpio_irq_chip = {
+	.name           = "owlgpio",
+	.irq_mask       = owl_gpio_irq_mask,
+	.irq_unmask     = owl_gpio_irq_unmask,
+	.irq_ack        = owl_gpio_irq_ack,
+	.irq_set_type   = owl_gpio_irq_set_type,
+};
+
 static int owl_gpio_init(struct owl_pinctrl *pctrl)
 {
 	struct gpio_chip *chip;
-	int ret;
+	int irqno, ret, i;
 
 	chip = &pctrl->chip;
 	chip->base = -1;
 	chip->ngpio = pctrl->soc->ngpios;
 	chip->label = dev_name(pctrl->dev);
 	chip->parent = pctrl->dev;
+	chip->to_irq = owl_gpio_to_irq;
 	chip->owner = THIS_MODULE;
 	chip->of_node = pctrl->dev->of_node;
 
@@ -720,6 +899,29 @@  static int owl_gpio_init(struct owl_pinctrl *pctrl)
 		return ret;
 	}
 
+	pctrl->domain = irq_domain_add_linear(chip->of_node,
+					     chip->ngpio,
+					     &irq_domain_simple_ops,
+					     NULL);
+	if (!pctrl->domain) {
+		dev_err(pctrl->dev, "Couldn't register IRQ domain\n");
+		gpiochip_remove(&pctrl->chip);
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < chip->ngpio; i++) {
+		irqno = irq_create_mapping(pctrl->domain, i);
+		irq_set_chip_and_handler(irqno, &owl_gpio_irq_chip,
+					 handle_edge_irq);
+		irq_set_chip_data(irqno, pctrl);
+	}
+
+	for (i = 0; i < pctrl->soc->nports; i++) {
+		irq_set_chained_handler_and_data(pctrl->irq[i],
+						owl_gpio_irq_handler,
+						pctrl);
+	}
+
 	return 0;
 }
 
@@ -728,7 +930,7 @@  int owl_pinctrl_probe(struct platform_device *pdev,
 {
 	struct resource *res;
 	struct owl_pinctrl *pctrl;
-	int ret;
+	int ret, i;
 
 	pctrl = devm_kzalloc(&pdev->dev, sizeof(*pctrl), GFP_KERNEL);
 	if (!pctrl)
@@ -772,14 +974,35 @@  int owl_pinctrl_probe(struct platform_device *pdev,
 					&owl_pinctrl_desc, pctrl);
 	if (IS_ERR(pctrl->pctrldev)) {
 		dev_err(&pdev->dev, "could not register Actions OWL pinmux driver\n");
-		return PTR_ERR(pctrl->pctrldev);
+		ret = PTR_ERR(pctrl->pctrldev);
+		goto err_exit;
+	}
+
+	pctrl->irq = devm_kcalloc(&pdev->dev, pctrl->soc->nports,
+				  sizeof(*pctrl->irq), GFP_KERNEL);
+	if (!pctrl->irq) {
+		ret = -ENOMEM;
+		goto err_exit;
+	}
+
+	for (i = 0; i < pctrl->soc->nports ; i++) {
+		pctrl->irq[i] = platform_get_irq(pdev, i);
+		if (pctrl->irq[i] < 0) {
+			ret = pctrl->irq[i];
+			goto err_exit;
+		}
 	}
 
 	ret = owl_gpio_init(pctrl);
 	if (ret)
-		return ret;
+		goto err_exit;
 
 	platform_set_drvdata(pdev, pctrl);
 
 	return 0;
+
+err_exit:
+	clk_disable_unprepare(pctrl->clk);
+
+	return ret;
 }
diff --git a/drivers/pinctrl/actions/pinctrl-owl.h b/drivers/pinctrl/actions/pinctrl-owl.h
index 74342378937c..a724d1d406d4 100644
--- a/drivers/pinctrl/actions/pinctrl-owl.h
+++ b/drivers/pinctrl/actions/pinctrl-owl.h
@@ -29,6 +29,18 @@  enum owl_pinconf_drv {
 	OWL_PINCONF_DRV_12MA,
 };
 
+/* GPIO CTRL Bit Definition */
+#define OWL_GPIO_CTLR_PENDING		0
+#define OWL_GPIO_CTLR_ENABLE		1
+#define OWL_GPIO_CTLR_SAMPLE_CLK_24M	2
+
+/* GPIO TYPE Bit Definition */
+#define OWL_GPIO_INT_LEVEL_HIGH		0
+#define OWL_GPIO_INT_LEVEL_LOW		1
+#define OWL_GPIO_INT_EDGE_RISING	2
+#define OWL_GPIO_INT_EDGE_FALLING	3
+#define OWL_GPIO_INT_MASK		3
+
 /**
  * struct owl_pullctl - Actions pad pull control register
  * @reg: offset to the pull control register
@@ -121,6 +133,10 @@  struct owl_pinmux_func {
  * @outen: offset of the output enable register.
  * @inen: offset of the input enable register.
  * @dat: offset of the data register.
+ * @intc_ctl: offset of the interrupt control register.
+ * @intc_pd: offset of the interrupt pending register.
+ * @intc_msk: offset of the interrupt mask register.
+ * @intc_type: offset of the interrupt type register.
  */
 struct owl_gpio_port {
 	unsigned int offset;
@@ -128,6 +144,10 @@  struct owl_gpio_port {
 	unsigned int outen;
 	unsigned int inen;
 	unsigned int dat;
+	unsigned int intc_ctl;
+	unsigned int intc_pd;
+	unsigned int intc_msk;
+	unsigned int intc_type;
 };
 
 /**
@@ -140,7 +160,7 @@  struct owl_gpio_port {
  * @ngroups: number of entries in @groups.
  * @padinfo: array describing the pad info of this SoC.
  * @ngpios: number of pingroups the driver should expose as GPIOs.
- * @port: array describing all GPIO ports of this SoC.
+ * @ports: array describing all GPIO ports of this SoC.
  * @nports: number of GPIO ports in this SoC.
  */
 struct owl_pinctrl_soc_data {
diff --git a/drivers/pinctrl/actions/pinctrl-s900.c b/drivers/pinctrl/actions/pinctrl-s900.c
index 5503c7945764..ea67b14ef93b 100644
--- a/drivers/pinctrl/actions/pinctrl-s900.c
+++ b/drivers/pinctrl/actions/pinctrl-s900.c
@@ -1821,22 +1821,27 @@  static struct owl_padinfo s900_padinfo[NUM_PADS] = {
 	[SGPIO3] = PAD_INFO_PULLCTL_ST(SGPIO3)
 };
 
-#define OWL_GPIO_PORT(port, base, count, _outen, _inen, _dat)	\
-	[OWL_GPIO_PORT_##port] = {				\
-		.offset = base,					\
-		.pins = count,					\
-		.outen = _outen,				\
-		.inen = _inen,					\
-		.dat = _dat,					\
+#define OWL_GPIO_PORT(port, base, count, _outen, _inen, _dat,		\
+			_intc_ctl, _intc_pd, _intc_msk, _intc_type)	\
+	[OWL_GPIO_PORT_##port] = {					\
+		.offset = base,						\
+		.pins = count,						\
+		.outen = _outen,					\
+		.inen = _inen,						\
+		.dat = _dat,						\
+		.intc_ctl = _intc_ctl,					\
+		.intc_pd = _intc_pd,					\
+		.intc_msk = _intc_msk,					\
+		.intc_type = _intc_type,				\
 	}
 
 static const struct owl_gpio_port s900_gpio_ports[] = {
-	OWL_GPIO_PORT(A, 0x0000, 32, 0x0, 0x4, 0x8),
-	OWL_GPIO_PORT(B, 0x000C, 32, 0x0, 0x4, 0x8),
-	OWL_GPIO_PORT(C, 0x0018, 12, 0x0, 0x4, 0x8),
-	OWL_GPIO_PORT(D, 0x0024, 30, 0x0, 0x4, 0x8),
-	OWL_GPIO_PORT(E, 0x0030, 32, 0x0, 0x4, 0x8),
-	OWL_GPIO_PORT(F, 0x00F0, 8, 0x0, 0x4, 0x8)
+	OWL_GPIO_PORT(A, 0x0000, 32, 0x0, 0x4, 0x8, 0x204, 0x208, 0x20C, 0x240),
+	OWL_GPIO_PORT(B, 0x000C, 32, 0x0, 0x4, 0x8, 0x534, 0x204, 0x208, 0x23C),
+	OWL_GPIO_PORT(C, 0x0018, 12, 0x0, 0x4, 0x8, 0x52C, 0x200, 0x204, 0x238),
+	OWL_GPIO_PORT(D, 0x0024, 30, 0x0, 0x4, 0x8, 0x524, 0x1FC, 0x200, 0x234),
+	OWL_GPIO_PORT(E, 0x0030, 32, 0x0, 0x4, 0x8, 0x51C, 0x1F8, 0x1FC, 0x230),
+	OWL_GPIO_PORT(F, 0x00F0, 8, 0x0, 0x4, 0x8, 0x460, 0x140, 0x144, 0x178)
 };
 
 static struct owl_pinctrl_soc_data s900_pinctrl_data = {