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Date: Fri, 5 Jun 2015 08:51:02 +0200
From: Romain Baeriswyl <romain.baeriswyl@...tech.com>
To: Linus Walleij <linus.walleij@...aro.org>,
Alexandre Courbot <gnurou@...il.com>,
linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
Christian Ruppert <christian.ruppert@...tech.com>,
Anton Vorontsov <cbouatmailru@...il.com>,
Rojhalat Ibrahim <imr@...chenk.de>,
abdoulaye berthe <berthe.ab@...il.com>,
Anthony Fee <anthony.fee@...tex.com>,
Alexander Shiyan <shc_work@...l.ru>
Cc: Romain Baeriswyl <romain.baeriswyl@...tech.com>
Subject: [PATCH] added device tree support to gpio-generic driver
---
.../devicetree/bindings/gpio/gpio-generic.txt | 19 +++++
drivers/gpio/gpio-generic.c | 81 ++++++++++++++-----
2 files changed, 78 insertions(+), 22 deletions(-)
create mode 100644 Documentation/devicetree/bindings/gpio/gpio-generic.txt
diff --git a/Documentation/devicetree/bindings/gpio/gpio-generic.txt b/Documentation/devicetree/bindings/gpio/gpio-generic.txt
new file mode 100644
index 0000000..c2c4b98
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-generic.txt
@@ -0,0 +1,19 @@
+Bindings for gpio-generic
+
+Required properties:
+- compatible : "basic-mmio-gpio" for little endian register access or
+ "basic-mmio-gpio-be" for big endian register access
+- ngpios: Specifies the number of gpio mapped in the register. The value is
+ limited to the number of bits of the LONG type.
+
+Optional properties:
+- base: Allows to forces the gpio number base offset used to index the gpio in
+ the device. If it is not see then the driver search autonoumously for
+ valid index range.
+
+Examples:
+
+ gpio_a {
+ compatible = "basic-mmio-gpio";
+ ngpios = <32>;
+ };
diff --git a/drivers/gpio/gpio-generic.c b/drivers/gpio/gpio-generic.c
index b92a690..9a4354c 100644
--- a/drivers/gpio/gpio-generic.c
+++ b/drivers/gpio/gpio-generic.c
@@ -15,11 +15,11 @@
* `.just a single "data" register, where GPIO state can be read and/or `
* `,..written. ,,..``~~~~ .....``.`.`.~~.```.`.........``````.```````
* `````````
- ___
-_/~~|___/~| . ```~~~~~~ ___/___\___ ,~.`.`.`.`````.~~...,,,,...
-__________|~$@~~~ %~ /o*o*o*o*o*o\ .. Implementing such a GPIO .
-o ` ~~~~\___/~~~~ ` controller in FPGA is ,.`
- `....trivial..'~`.```.```
+ * ___
+ * _/~~|___/~| . ```~~~~~~ ___/___\___ ,~.`.`.`.`````.~~...,,,,...
+ * __________|~$@~~~ %~ /o*o*o*o*o*o\ .. Implementing such a GPIO .
+ * o ` ~~~~\___/~~~~ ` controller in FPGA is ,.`
+ * `....trivial..'~`.```.```
* ```````
* .```````~~~~`..`.``.``.
* . The driver supports `... ,..```.`~~~```````````````....````.``,,
@@ -61,6 +61,8 @@ o ` ~~~~\___/~~~~ ` controller in FPGA is ,.`
#include <linux/platform_device.h>
#include <linux/mod_devicetable.h>
#include <linux/basic_mmio_gpio.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
static void bgpio_write8(void __iomem *reg, unsigned long data)
{
@@ -375,10 +377,9 @@ static int bgpio_setup_accessors(struct device *dev,
dev_err(dev,
"64 bit big endian byte order unsupported\n");
return -EINVAL;
- } else {
- bgc->read_reg = bgpio_read64;
- bgc->write_reg = bgpio_write64;
}
+ bgc->read_reg = bgpio_read64;
+ bgc->write_reg = bgpio_write64;
break;
#endif /* BITS_PER_LONG >= 64 */
default:
@@ -564,6 +565,27 @@ static void __iomem *bgpio_map(struct platform_device *pdev,
return ret;
}
+static const struct platform_device_id bgpio_id_table[] = {
+ { "basic-mmio-gpio",
+ .driver_data = 0,
+ }, { "basic-mmio-gpio-be",
+ .driver_data = BGPIOF_BIG_ENDIAN
+ },
+ { },
+};
+MODULE_DEVICE_TABLE(platform, bgpio_id_table);
+
+static const struct of_device_id bgpio_dt_ids[] = {
+ { .compatible = "basic-mmio-gpio",
+ .data = bgpio_id_table + 0
+ },
+ { .compatible = "basic-mmio-gpio-be",
+ .data = bgpio_id_table + 1
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(of, bgpio_dt_ids);
+
static int bgpio_pdev_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -574,10 +596,37 @@ static int bgpio_pdev_probe(struct platform_device *pdev)
void __iomem *dirout;
void __iomem *dirin;
unsigned long sz;
- unsigned long flags = pdev->id_entry->driver_data;
+ unsigned long flags;
int err;
struct bgpio_chip *bgc;
- struct bgpio_pdata *pdata = dev_get_platdata(dev);
+ struct bgpio_pdata *pdata;
+
+ if (of_have_populated_dt()) {
+ const struct of_device_id *of_id =
+ of_match_device(bgpio_dt_ids, dev);
+
+ pdata = devm_kzalloc(dev, sizeof(struct bgpio_pdata),
+ GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ if (of_property_read_u32(dev->of_node, "ngpio",
+ &pdata->ngpio)) {
+ dev_err(dev, "Failed to get field ngpio");
+ return -EINVAL;
+ }
+ if (of_property_read_u32(dev->of_node, "base", &pdata->base))
+ pdata->base = -1;
+
+ dev->platform_data = pdata;
+
+ if (of_id)
+ pdev->id_entry = of_id->data;
+ }
+
+ pdata = dev_get_platdata(dev);
+
+ flags = pdev->id_entry->driver_data;
r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dat");
if (!r)
@@ -633,18 +682,6 @@ static int bgpio_pdev_remove(struct platform_device *pdev)
return bgpio_remove(bgc);
}
-static const struct platform_device_id bgpio_id_table[] = {
- {
- .name = "basic-mmio-gpio",
- .driver_data = 0,
- }, {
- .name = "basic-mmio-gpio-be",
- .driver_data = BGPIOF_BIG_ENDIAN,
- },
- { }
-};
-MODULE_DEVICE_TABLE(platform, bgpio_id_table);
-
static struct platform_driver bgpio_driver = {
.driver = {
.name = "basic-mmio-gpio",
--
1.7.1
*********************************************************
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