[PATCH v1 1/3] device property: Implement device_is_big_endian()

Andy Shevchenko
2023-10-25T18:43:12Z

Some users want to use the struct device pointer to see if the
device is big endian in terms of Open Firmware specifications,
i.e. if it has a "big-endian" property, or if the kernel was
compiled for BE *and* the device has a "native-endian" property.

Provide inline helper for the users.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
include/linux/property.h | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)

diff --git a/include/linux/property.h b/include/linux/property.h
index 2b8f07fc68a9..d1400a477b0a 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -80,12 +80,38 @@ int fwnode_property_match_string(const struct fwnode_handle *fwnode,

bool fwnode_device_is_available(const struct fwnode_handle *fwnode);

+static inline bool fwnode_device_is_big_endian(const struct fwnode_handle *fwnode)
+{
+ if (fwnode_property_present(fwnode, "big-endian"))
+ return true;
+ if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) &&
+ fwnode_property_present(fwnode, "native-endian"))
+ return true;
+ return false;
+}
+
static inline
bool fwnode_device_is_compatible(const struct fwnode_handle *fwnode, const char *compat)
{
return fwnode_property_match_string(fwnode, "compatible", compat) >= 0;
}

+/**
+ * device_is_big_endian - check if a device has BE registers
+ * @dev: Pointer to the struct device
+ *
+ * Returns: true if the device has a "big-endian" property, or if the kernel
+ * was compiled for BE *and* the device has a "native-endian" property.
+ * Returns false otherwise.
+ *
+ * Callers would nominally use ioread32be/iowrite32be if
+ * device_is_big_endian() == true, or readl/writel otherwise.
+ */
+static inline bool device_is_big_endian(const struct device *dev)
+{
+ return fwnode_device_is_big_endian(dev_fwnode(dev));
+}
+
/**
* device_is_compatible - match 'compatible' property of the device with a given string
* @dev: Pointer to the struct device
--
2.40.0.1.gaa8946217a0b