[RFC 2/6] pinctrl: samsung: Parse pin banks from DT
Tomasz Figa
t.figa at samsung.com
Thu Sep 20 04:53:13 EDT 2012
Currently platform-specific properties such as list of pin banks,
register offsets and bitfield sizes is being taken from static data
structure residing in pinctrl-exynos.c.
This patch modifies the pinctrl-samsung driver to parse all
platform-specific data from device tree, which will allow to remove the
static data structures and facilitate adding of further SoC variants to
the pinctrl-samsung driver.
Signed-off-by: Tomasz Figa <t.figa at samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
---
drivers/pinctrl/pinctrl-exynos.c | 5 ++
drivers/pinctrl/pinctrl-samsung.c | 148 +++++++++++++++++++++++++++++++++++++-
drivers/pinctrl/pinctrl-samsung.h | 17 ++++-
3 files changed, 166 insertions(+), 4 deletions(-)
diff --git a/drivers/pinctrl/pinctrl-exynos.c b/drivers/pinctrl/pinctrl-exynos.c
index 575378a..827b744 100644
--- a/drivers/pinctrl/pinctrl-exynos.c
+++ b/drivers/pinctrl/pinctrl-exynos.c
@@ -599,3 +599,8 @@ struct samsung_pin_ctrl exynos4210_pin_ctrl[] = {
.label = "exynos4210-gpio-ctrl2",
},
};
+
+struct samsung_pin_ctrl_variant exynos4_pin_ctrl = {
+ .eint_gpio_init = exynos_eint_gpio_init,
+ .eint_wkup_init = exynos_eint_wkup_init,
+};
diff --git a/drivers/pinctrl/pinctrl-samsung.c b/drivers/pinctrl/pinctrl-samsung.c
index dd108a9..ff1d001 100644
--- a/drivers/pinctrl/pinctrl-samsung.c
+++ b/drivers/pinctrl/pinctrl-samsung.c
@@ -26,6 +26,7 @@
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/gpio.h>
+#include <linux/spinlock.h>
#include "core.h"
#include "pinctrl-samsung.h"
@@ -46,6 +47,10 @@ struct pin_config {
{ "samsung,pin-pud-pdn", PINCFG_TYPE_PUD_PDN },
};
+DEFINE_SPINLOCK(init_lock);
+
+static unsigned int pin_base = 0;
+
/* check if the selector is a valid pin group selector */
static int samsung_get_group_count(struct pinctrl_dev *pctldev)
{
@@ -599,6 +604,8 @@ static int __init samsung_pinctrl_parse_dt(struct platform_device *pdev,
u32 function;
if (of_find_property(cfg_np, "interrupt-controller", NULL))
continue;
+ if (of_find_property(cfg_np, "gpio-controller", NULL))
+ continue;
ret = samsung_pinctrl_parse_dt_pins(pdev, cfg_np,
&drvdata->pctl, &pin_list, &npins);
@@ -775,6 +782,59 @@ static int __init samsung_gpiolib_unregister(struct platform_device *pdev,
static const struct of_device_id samsung_pinctrl_dt_match[];
+static int samsung_pinctrl_parse_dt_bank(struct samsung_pin_bank *bank,
+ struct device_node *np)
+{
+ int ret;
+ u32 val;
+
+ ret = of_property_read_string(np, "samsung,pin-bank", &bank->name);
+ if (ret)
+ return ret;
+
+ ret = of_property_read_u32(np, "samsung,pctl-offset", &val);
+ if (ret)
+ return ret;
+ bank->pctl_offset = val;
+
+ ret = of_property_read_u32(np, "samsung,pin-count", &val);
+ if (ret)
+ return ret;
+ bank->nr_pins = val;
+
+ ret = of_property_read_u32(np, "samsung,func-width", &val);
+ if (ret)
+ return ret;
+ bank->func_width = val;
+
+ ret = of_property_read_u32(np, "samsung,pud-width", &val);
+ if (ret)
+ return ret;
+ bank->pud_width = val;
+
+ ret = of_property_read_u32(np, "samsung,drv-width", &val);
+ if (ret)
+ return ret;
+ bank->drv_width = val;
+
+ ret = of_property_read_u32(np, "samsung,conpdn-width", &val);
+ if (!ret)
+ bank->conpdn_width = val;
+
+ ret = of_property_read_u32(np, "samsung,pudpdn-width", &val);
+ if (!ret)
+ bank->pudpdn_width = val;
+
+ if (!of_find_property(np, "interrupt-controller", NULL)) {
+ bank->eint_type = EINT_TYPE_NONE;
+ return 0;
+ }
+
+ bank->eint_type = EINT_TYPE_GPIO;
+
+ return 0;
+}
+
/* retrieve the soc specific data */
static struct samsung_pin_ctrl *samsung_pinctrl_get_soc_data(
struct platform_device *pdev)
@@ -782,6 +842,14 @@ static struct samsung_pin_ctrl *samsung_pinctrl_get_soc_data(
int id;
const struct of_device_id *match;
const struct device_node *node = pdev->dev.of_node;
+ struct device_node *bank_np;
+ struct samsung_pin_ctrl *ctrl;
+ struct samsung_pin_bank *banks, *b;
+ struct samsung_pin_ctrl_variant *variant;
+ unsigned int bank_cnt = 0;
+ unsigned int eint_cnt = 0;
+ u32 val;
+ int ret;
id = of_alias_get_id(pdev->dev.of_node, "pinctrl");
if (id < 0) {
@@ -789,7 +857,83 @@ static struct samsung_pin_ctrl *samsung_pinctrl_get_soc_data(
return NULL;
}
match = of_match_node(samsung_pinctrl_dt_match, node);
- return (struct samsung_pin_ctrl *)match->data + id;
+ variant = match->data;
+
+ for_each_child_of_node(node, bank_np) {
+ if (!of_find_property(bank_np, "gpio-controller", NULL))
+ continue;
+ ++bank_cnt;
+ }
+
+ if (!bank_cnt) {
+ dev_err(&pdev->dev, "no pin banks specified\n");
+ return NULL;
+ }
+
+ ctrl = devm_kzalloc(&pdev->dev, sizeof(*ctrl), GFP_KERNEL);
+ if (!ctrl) {
+ dev_err(&pdev->dev, "failed to allocate soc data\n");
+ return NULL;
+ }
+
+ banks = devm_kzalloc(&pdev->dev,
+ bank_cnt * sizeof(*ctrl->pin_banks), GFP_KERNEL);
+ if (!banks) {
+ dev_err(&pdev->dev, "failed to allocate pin banks\n");
+ return NULL;
+ }
+
+ b = banks;
+ for_each_child_of_node(node, bank_np) {
+ if (!of_find_property(bank_np, "gpio-controller", NULL))
+ continue;
+ if (samsung_pinctrl_parse_dt_bank(b, bank_np))
+ return NULL;
+ b->pin_base = ctrl->nr_pins;
+ ctrl->nr_pins += b->nr_pins;
+ if (of_find_property(bank_np, "interrupt-controller", NULL)) {
+ b->irq_base = eint_cnt;
+ eint_cnt += b->nr_pins;
+ }
+ ++b;
+ }
+
+ if (eint_cnt) {
+ ret = of_property_read_u32(node, "samsung,geint-con", &val);
+ if (ret)
+ return NULL;
+ ctrl->geint_con = val;
+
+ ret = of_property_read_u32(node, "samsung,geint-mask", &val);
+ if (ret)
+ return NULL;
+ ctrl->geint_mask = val;
+
+ ret = of_property_read_u32(node, "samsung,geint-pend", &val);
+ if (ret)
+ return NULL;
+ ctrl->geint_pend = val;
+
+ ret = of_property_read_u32(node, "samsung,svc", &val);
+ if (ret)
+ return NULL;
+ ctrl->svc = val;
+
+ ctrl->eint_gpio_init = variant->eint_gpio_init;
+ }
+
+ ctrl->pin_banks = banks;
+ ctrl->nr_banks = bank_cnt;
+ ctrl->nr_gint = eint_cnt;
+ ctrl->label = node->name;
+ ctrl->eint_wkup_init = variant->eint_wkup_init;
+
+ spin_lock(&init_lock);
+ ctrl->base = pin_base;
+ pin_base += ctrl->nr_pins;
+ spin_unlock(&init_lock);
+
+ return ctrl;
}
static int __devinit samsung_pinctrl_probe(struct platform_device *pdev)
@@ -857,7 +1001,7 @@ static int __devinit samsung_pinctrl_probe(struct platform_device *pdev)
static const struct of_device_id samsung_pinctrl_dt_match[] = {
{ .compatible = "samsung,pinctrl-exynos4210",
- .data = (void *)exynos4210_pin_ctrl },
+ .data = &exynos4_pin_ctrl },
{},
};
MODULE_DEVICE_TABLE(of, samsung_pinctrl_dt_match);
diff --git a/drivers/pinctrl/pinctrl-samsung.h b/drivers/pinctrl/pinctrl-samsung.h
index b895693..5d59ce6 100644
--- a/drivers/pinctrl/pinctrl-samsung.h
+++ b/drivers/pinctrl/pinctrl-samsung.h
@@ -123,7 +123,19 @@ struct samsung_pin_bank {
u8 pudpdn_width;
enum eint_type eint_type;
u32 irq_base;
- char *name;
+ const char *name;
+};
+
+/**
+ * struct samsung_pin_ctrl_variant: represents a pin controller variant.
+ * @eint_gpio_init: platform specific callback to setup the external gpio
+ * interrupts for the controller.
+ * @eint_wkup_init: platform specific callback to setup the external wakeup
+ * interrupts for the controller.
+ */
+struct samsung_pin_ctrl_variant {
+ int (*eint_gpio_init)(struct samsung_pinctrl_drv_data *);
+ int (*eint_wkup_init)(struct samsung_pinctrl_drv_data *);
};
/**
@@ -168,7 +180,7 @@ struct samsung_pin_ctrl {
int (*eint_gpio_init)(struct samsung_pinctrl_drv_data *);
int (*eint_wkup_init)(struct samsung_pinctrl_drv_data *);
- char *label;
+ const char *label;
};
/**
@@ -235,5 +247,6 @@ struct samsung_pmx_func {
/* list of all exported SoC specific data */
extern struct samsung_pin_ctrl exynos4210_pin_ctrl[];
+extern struct samsung_pin_ctrl_variant exynos4_pin_ctrl;
#endif /* __PINCTRL_SAMSUNG_H */
--
1.7.12
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