dm: gpio: Add better functions to request GPIOs
At present U-Boot sort-of supports the standard way of reading GPIOs from
device tree nodes, but the support is incomplete, a bit clunky and only
works for GPIO bindings where #gpio-cells is 2.
Add new functions to request GPIOs, taking full account of the device
tree binding. These permit requesting a GPIO with a simple call like:
gpio_request_by_name(dev, "cd-gpios", 0, &desc, GPIOD_IS_IN);
This will request the GPIO, looking at the device's node which might be
this, for example:
cd-gpios = <&gpio TEGRA_GPIO(B, 3) GPIO_ACTIVE_LOW>;
The GPIO will be set to input mode in this case and polarity will be
honoured by the GPIO calls.
It is also possible to request and free a list of GPIOs.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/test/dm/gpio.c b/test/dm/gpio.c
index 94bd0d9..b29daf1 100644
--- a/test/dm/gpio.c
+++ b/test/dm/gpio.c
@@ -174,5 +174,72 @@
return 0;
}
-
DM_TEST(dm_test_gpio_leak, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
+
+/* Test that we can find GPIOs using phandles */
+static int dm_test_gpio_phandles(struct dm_test_state *dms)
+{
+ struct gpio_desc desc, desc_list[8], desc_list2[8];
+ struct udevice *dev, *gpio_a, *gpio_b;
+
+ ut_assertok(uclass_get_device(UCLASS_TEST_FDT, 0, &dev));
+ ut_asserteq_str("a-test", dev->name);
+
+ ut_assertok(gpio_request_by_name(dev, "test-gpios", 1, &desc, 0));
+ ut_assertok(uclass_get_device(UCLASS_GPIO, 1, &gpio_a));
+ ut_assertok(uclass_get_device(UCLASS_GPIO, 2, &gpio_b));
+ ut_asserteq_str("base-gpios", gpio_a->name);
+ ut_asserteq(true, !!device_active(gpio_a));
+ ut_asserteq_ptr(gpio_a, desc.dev);
+ ut_asserteq(4, desc.offset);
+ /* GPIOF_INPUT is the sandbox GPIO driver default */
+ ut_asserteq(GPIOF_INPUT, gpio_get_function(gpio_a, 4, NULL));
+ ut_assertok(dm_gpio_free(dev, &desc));
+
+ ut_asserteq(-ENOENT, gpio_request_by_name(dev, "test-gpios", 3, &desc,
+ 0));
+ ut_asserteq_ptr(NULL, desc.dev);
+ ut_asserteq(desc.offset, 0);
+ ut_asserteq(-ENOENT, gpio_request_by_name(dev, "test-gpios", 5, &desc,
+ 0));
+
+ /* Last GPIO is ignord as it comes after <0> */
+ ut_asserteq(3, gpio_request_list_by_name(dev, "test-gpios", desc_list,
+ ARRAY_SIZE(desc_list), 0));
+ ut_asserteq(-EBUSY, gpio_request_list_by_name(dev, "test-gpios",
+ desc_list2,
+ ARRAY_SIZE(desc_list2),
+ 0));
+ ut_assertok(gpio_free_list(dev, desc_list, 3));
+ ut_asserteq(3, gpio_request_list_by_name(dev, "test-gpios", desc_list,
+ ARRAY_SIZE(desc_list),
+ GPIOD_IS_OUT |
+ GPIOD_IS_OUT_ACTIVE));
+ ut_asserteq_ptr(gpio_a, desc_list[0].dev);
+ ut_asserteq(1, desc_list[0].offset);
+ ut_asserteq_ptr(gpio_a, desc_list[1].dev);
+ ut_asserteq(4, desc_list[1].offset);
+ ut_asserteq_ptr(gpio_b, desc_list[2].dev);
+ ut_asserteq(5, desc_list[2].offset);
+ ut_asserteq(1, dm_gpio_get_value(desc_list));
+ ut_assertok(gpio_free_list(dev, desc_list, 3));
+
+ ut_asserteq(6, gpio_request_list_by_name(dev, "test2-gpios", desc_list,
+ ARRAY_SIZE(desc_list), 0));
+ /* This was set to output previously, so still will be */
+ ut_asserteq(GPIOF_OUTPUT, gpio_get_function(gpio_a, 1, NULL));
+
+ /* Active low should invert the input value */
+ ut_asserteq(GPIOF_INPUT, gpio_get_function(gpio_b, 6, NULL));
+ ut_asserteq(1, dm_gpio_get_value(&desc_list[2]));
+
+ ut_asserteq(GPIOF_INPUT, gpio_get_function(gpio_b, 7, NULL));
+ ut_asserteq(GPIOF_OUTPUT, gpio_get_function(gpio_b, 8, NULL));
+ ut_asserteq(0, dm_gpio_get_value(&desc_list[4]));
+ ut_asserteq(GPIOF_OUTPUT, gpio_get_function(gpio_b, 9, NULL));
+ ut_asserteq(1, dm_gpio_get_value(&desc_list[5]));
+
+
+ return 0;
+}
+DM_TEST(dm_test_gpio_phandles, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);