diff options
| author | Simon Glass <sjg@chromium.org> | 2017-06-12 06:21:30 -0600 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2017-07-11 10:08:20 -0600 |
| commit | f7d6fcf7aead384ea39bc7aba581e912c3759eaa (patch) | |
| tree | aae54342a8ce91b9c5ad4ba9418e42d2d891586b | |
| parent | a44810123f9ef069587beacdce7d6f488cf42973 (diff) | |
dm: core: Add dev_read_enabled() to check if a device is enabled
This function allows a device's status to be read. This indicates whether
the device should be enabled or disabled.
Note: In normal operation disabled devices will not be present in the
driver-model tree.
Signed-off-by: Simon Glass <sjg@chromium.org>
Tested-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Tested-on: Beaver, Jetson-TK1
| -rw-r--r-- | drivers/core/read.c | 11 | ||||
| -rw-r--r-- | include/dm/read.h | 18 |
2 files changed, 29 insertions, 0 deletions
diff --git a/drivers/core/read.c b/drivers/core/read.c index 3131e5379c..1080767313 100644 --- a/drivers/core/read.c +++ b/drivers/core/read.c @@ -138,3 +138,14 @@ const uint8_t *dev_read_u8_array_ptr(struct udevice *dev, const char *propname, { return ofnode_read_u8_array_ptr(dev_ofnode(dev), propname, sz); } + +int dev_read_enabled(struct udevice *dev) +{ + ofnode node = dev_ofnode(dev); + + if (ofnode_is_np(node)) + return of_device_is_available(ofnode_to_np(node)); + else + return fdtdec_get_is_enabled(gd->fdt_blob, + ofnode_to_offset(node)); +} diff --git a/include/dm/read.h b/include/dm/read.h index 65d5d1f357..cea1c16a00 100644 --- a/include/dm/read.h +++ b/include/dm/read.h @@ -315,6 +315,19 @@ ofnode dev_read_next_subnode(ofnode node); const uint8_t *dev_read_u8_array_ptr(struct udevice *dev, const char *propname, size_t sz); +/** + * dev_read_enabled() - check whether a node is enabled + * + * This looks for a 'status' property. If this exists, then returns 1 if + * the status is 'ok' and 0 otherwise. If there is no status property, + * it returns 1 on the assumption that anything mentioned should be enabled + * by default. + * + * @dev: device to examine + * @return integer value 0 (not enabled) or 1 (enabled) + */ +int dev_read_enabled(struct udevice *dev); + #else /* CONFIG_DM_DEV_READ_INLINE is enabled */ static inline int dev_read_u32_default(struct udevice *dev, @@ -432,6 +445,11 @@ static inline const uint8_t *dev_read_u8_array_ptr(struct udevice *dev, return ofnode_read_u8_array_ptr(dev_ofnode(dev), propname, sz); } +static inline int dev_read_enabled(struct udevice *dev) +{ + return fdtdec_get_is_enabled(gd->fdt_blob, dev_of_offset(dev)); +} + #endif /* CONFIG_DM_DEV_READ_INLINE */ /** |