iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

device property: Implement device_is_big_endian()

Browse Source 
[ 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@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>
Stable-dep-of: 87d80bfbd577 ("serial: 8250_dw: Don't use struct dw8250_data outside of 8250_dw")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Andy Shevchenko 2023-10-25 21:42:57 +03:00 committed by Greg Kroah-Hartman
parent dd431c3ac1
commit 1006d1b5eb
1 changed files with 26 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
include/linux/property.h
View File

@ -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