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| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2023-10-25 20:42:57 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-12-15 15:47:04 +0100 |
| commit | 826a5d8c9df9605fb4fdefa45432f95580241a1f (patch) | |
| tree | 9b9c8ab7978ae7da537e7da78f9c37e8a640dc94 | |
| parent | Linux 6.7-rc3 (diff) | |
| download | linux-826a5d8c9df9605fb4fdefa45432f95580241a1f.tar.xz linux-826a5d8c9df9605fb4fdefa45432f95580241a1f.zip | |
device property: Implement device_is_big_endian()
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>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20231025184259.250588-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | include/linux/property.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/include/linux/property.h b/include/linux/property.h index 9f2585d705a8..55c2692ffa8c 100644 --- a/include/linux/property.h +++ b/include/linux/property.h @@ -80,6 +80,16 @@ 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) { @@ -87,6 +97,22 @@ bool fwnode_device_is_compatible(const struct fwnode_handle *fwnode, const char } /** + * 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 * @compat: The string to match 'compatible' property with |