There is no mention of a signed data type. See this warning, W=3 has to be provided to the make command.ġ47 np = of_find_node_by_name(NULL, "node_xxx") ġ50 rc = of_property_read_u32(np, "a", &val) ġ54 rc = of_property_read_u32(np, "b", &val) ġ58 rc = of_property_read_u32(np, "c", &val) ġ62 rc = of_property_read_u32(np, "d", &val) ĭrivers/misc/xxx.c:151:2: warning: conversion to 'int' from 'u32' may change the sign of the result ĭrivers/misc/xxx.c:155:2: warning: conversion to 'int' from 'u32' may change the sign of the result ĭrivers/misc/xxx.c:159:2: warning: conversion to 'int' from 'u32' may change the sign of the result ĭrivers/misc/xxx.c:163:2: warning: conversion to 'int' from 'u32' may change the sign of the result ĭevice Tree source Signed Property ValuesĮPAPR Version 1.1 lists the following data types for properties: Will warn that there is a possible problem.
Variable (as in the following example), then the compiler However, if the address of a u32 is passed to of_property_read_u32(),Īnd then the value of the u32 is assigned to an integer Instead of the address of a u32 was passed to of_property_read_u32(). There was no compiler warning that the address of an int This is because the integer variables treat the Property values, even though the device tree source contains only
Not a valid label matrix 7 file driver#
The console output from the example driver code shows some negative
Np = of_find_node_by_name(NULL, "node_xxx") ĭevice tree source, providing values for the properties a, b, c, and d:
Not a valid label matrix 7 file drivers#
(see Device Tree source : Signed Property ValuesĪ common incorrect pattern in Linux drivers is to read a u32 property value However, recent versions of the dtc compiler allow specifying negative values There is no signed data type for property values in device tree source files. 5 defaults and inheritance of #address-cells and #size-cellsĭevicetree: Kernel Internals and Practical Troubleshooting Ĭommon Linux Driver Errors Assign property value to a signed integer.3.10 Interrupt Nexus / Interrupt Mapping.
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