On 02/08/2013 10:26 PM, Sylwester Nawrocki wrote:
On 02/08/2013 09:38 PM, Sebastian Hesselbarth wrote:
This patch adds device tree parsing for gpio_ir_recv platform_data and
the mandatory binding documentation. It basically follows what we already
have for e.g. gpio_keys. All required device tree properties are OS
independent but an optional property allow linux specific support for rc
maps.
There was a similar patch sent by Matus Ujhelyi but that discussion
died after the first reviews.
Signed-off-by: Sebastian Hesselbarth<sebastian.hesselbarth@xxxxxxxxx>
---
Changelog
v1->v2:
- get rid of ptr returned by _get_devtree_pdata()
- check for of_node instead for NULL pdata
- remove unneccessary double check for gpios property
- remove unneccessary #ifdef CONFIG_OF around match table
Cc: Grant Likely<grant.likely@xxxxxxxxxxxx>
Cc: Rob Herring<rob.herring@xxxxxxxxxxx>
Cc: Rob Landley<rob@xxxxxxxxxxx>
Cc: Mauro Carvalho Chehab<mchehab@xxxxxxxxxx>
Cc: Sebastian Hesselbarth<sebastian.hesselbarth@xxxxxxxxx>
Cc: Benoit Thebaudeau<benoit.thebaudeau@xxxxxxxxxxxx>
Cc: David Hardeman<david@xxxxxxxxxxx>
Cc: Trilok Soni<tsoni@xxxxxxxxxxxxxx>
Cc: Sylwester Nawrocki<s.nawrocki@xxxxxxxxxxx>
Cc: Matus Ujhelyi<ujhelyi.m@xxxxxxxxx>
Cc: devicetree-discuss@xxxxxxxxxxxxxxxx
Cc: linux-doc@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: linux-media@xxxxxxxxxxxxxxx
---
.../devicetree/bindings/media/gpio-ir-receiver.txt | 16 ++++++
drivers/media/rc/gpio-ir-recv.c | 57 ++++++++++++++++++++
2 files changed, 73 insertions(+)
create mode 100644 Documentation/devicetree/bindings/media/gpio-ir-receiver.txt
diff --git a/Documentation/devicetree/bindings/media/gpio-ir-receiver.txt
b/Documentation/devicetree/bindings/media/gpio-ir-receiver.txt
new file mode 100644
index 0000000..8589f30
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/gpio-ir-receiver.txt
@@ -0,0 +1,16 @@
+Device-Tree bindings for GPIO IR receiver
+
+Required properties:
+ - compatible = "gpio-ir-receiver";
+ - gpios: OF device-tree gpio specification.
Perhaps:
- compatible: should be "gpio-ir-receiver";
- gpios: specifies GPIO used for IR signal reception.
?
Ok, i'll change that.
+
+Optional properties:
+ - linux,rc-map-name: Linux specific remote control map name.
+
+Example node:
+
+ ir: ir-receiver {
+ compatible = "gpio-ir-receiver";
+ gpios =<&gpio0 19 1>;
+ linux,rc-map-name = "rc-rc6-mce";
+ };
diff --git a/drivers/media/rc/gpio-ir-recv.c b/drivers/media/rc/gpio-ir-recv.c
index 4f71a7d..3c62006 100644
--- a/drivers/media/rc/gpio-ir-recv.c
+++ b/drivers/media/rc/gpio-ir-recv.c
@@ -16,6 +16,7 @@
#include<linux/interrupt.h>
#include<linux/gpio.h>
#include<linux/slab.h>
+#include<linux/of_gpio.h>
#include<linux/platform_device.h>
#include<linux/irq.h>
#include<media/rc-core.h>
@@ -30,6 +31,50 @@ struct gpio_rc_dev {
bool active_low;
};
+#ifdef CONFIG_OF
+/*
+ * Translate OpenFirmware node properties into platform_data
+ */
+static int gpio_ir_recv_get_devtree_pdata(struct device *dev,
+ struct gpio_ir_recv_platform_data *pdata)
+{
+ struct device_node *np = dev->of_node;
+ enum of_gpio_flags flags;
+ int gpio;
+
+ gpio = of_get_gpio_flags(np, 0,&flags);
+ if (gpio< 0) {
+ if (gpio != -EPROBE_DEFER)
+ dev_err(dev, "Failed to get gpio flags, error: %d\n",
+ gpio);
dev_err(dev, "Failed to get gpio flags (%d)\n", gpio);
?
Ack.
+ return gpio;
+ }
+
+ pdata->gpio_nr = gpio;
+ pdata->active_low = (flags& OF_GPIO_ACTIVE_LOW) ? true : false;
This could be simplified to:
pdata->active_low = (flags & OF_GPIO_ACTIVE_LOW);
Ack.
+ /* probe() takes care of map_name == NULL or allowed_protos == 0 */
+ pdata->map_name = of_get_property(np, "linux,rc-map-name", NULL);
+ pdata->allowed_protos = 0;
+
+ return 0;
+}
+
+static struct of_device_id gpio_ir_recv_of_match[] = {
+ { .compatible = "gpio-ir-receiver", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, gpio_ir_recv_of_match);
+
+#else /* !CONFIG_OF */
+
+static inline struct gpio_ir_recv_platform_data *
+gpio_ir_recv_get_devtree_pdata(struct device *dev)
Please check how it compiles with CONFIG_OF disabled ;)
Grrrml ;) I'll fix that of course...
You could also make it:
#define gpio_ir_recv_get_devtree_pdata (-ENOSYS)
Hmm, does that also play with parameter passing of the
CONFIG_OF gpio_ir_recv_get_devtree_pdata() ?
+{
+ return ERR_PTR(-ENODEV);
+}
+
+#endif
+
static irqreturn_t gpio_ir_recv_irq(int irq, void *dev_id)
{
struct gpio_rc_dev *gpio_dev = dev_id;
@@ -66,6 +111,17 @@ static int gpio_ir_recv_probe(struct platform_device *pdev)
pdev->dev.platform_data;
int rc;
+ if (pdev->dev.of_node) {
+ struct gpio_ir_recv_platform_data *dtpdata =
I think you could use pdata here instead, as previously. But I'm fine with
as it is now as well.
Yeah, but pdata is const and I will change it within _get_devtree_pdata().
I could cast the const away when passing it to gpio_ir_recv_get_devtree_pdata()
but it is almost the same amount of code.. and it is cleaner this way.
+ devm_kzalloc(&pdev->dev, sizeof(*dtpdata), GFP_KERNEL);
+ if (!dtpdata)
+ return -ENOMEM;
+ rc = gpio_ir_recv_get_devtree_pdata(&pdev->dev, dtpdata);
+ if (rc)
+ return rc;
+ pdata = dtpdata;
+ }
+
if (!pdata)
return -EINVAL;
@@ -192,6 +248,7 @@ static struct platform_driver gpio_ir_recv_driver = {
.driver = {
.name = GPIO_IR_DRIVER_NAME,
.owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(gpio_ir_recv_of_match),
#ifdef CONFIG_PM
.pm =&gpio_ir_recv_pm_ops,
#endif
The patch looks good to me in general, after fixing the empty function
declaration please feel free to add:
Reviewed-by: Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>
Thanks for the review (again),
I'll push a v3 with your remarks today or tomorrow.
Sebastian
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