6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> [ Upstream commit 826a5d8c9df9605fb4fdefa45432f95580241a1f ] 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@xxxxxxxxxxxxxxx> Acked-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx> Link: https://lore.kernel.org/r/20231025184259.250588-2-andriy.shevchenko@xxxxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Stable-dep-of: 87d80bfbd577 ("serial: 8250_dw: Don't use struct dw8250_data outside of 8250_dw") Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- include/linux/property.h | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/include/linux/property.h b/include/linux/property.h index 8c3c6685a2ae3..1684fca930f72 100644 --- a/include/linux/property.h +++ b/include/linux/property.h @@ -79,12 +79,38 @@ 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 -- 2.43.0
