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dm: core: Add a function to read into a unsigned int

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The current dev_read...() functions use s32 and u32 which are convenient
for device tree but not so useful for normal code, which often wants to
use normal integers for values.

Add a helper which supports returning an unsigned int. Also add signed
versions of the unsigned readers.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2018-12-10 10:37:37 -07:00
parent d490189865
commit a1b17e4f4c
4 changed files with 118 additions and 0 deletions
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2
arch/sandbox/dts/test.dts
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@ -87,6 +87,8 @@
test2-gpios = <&gpio_a 1>, <&gpio_a 4>, <&gpio_b 6 1 3 2 1>,
<&gpio_b 7 2 3 2 1>, <&gpio_b 8 4 3 2 1>,
<&gpio_b 9 0xc 3 2 1>;
int-value = <1234>;
uint-value = <(-1234)>;
};
junk {

23
drivers/core/read.c
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@ -21,6 +21,29 @@ int dev_read_u32_default(struct udevice *dev, const char *propname, int def)
return ofnode_read_u32_default(dev_ofnode(dev), propname, def);
}
int dev_read_s32(struct udevice *dev, const char *propname, s32 *outp)
{
return ofnode_read_u32(dev_ofnode(dev), propname, (u32 *)outp);
}
int dev_read_s32_default(struct udevice *dev, const char *propname, int def)
{
return ofnode_read_u32_default(dev_ofnode(dev), propname, def);
}
int dev_read_u32u(struct udevice *dev, const char *propname, uint *outp)
{
u32 val;
int ret;
ret = ofnode_read_u32(dev_ofnode(dev), propname, &val);
if (ret)
return ret;
*outp = val;
return 0;
}
const char *dev_read_string(struct udevice *dev, const char *propname)
{
return ofnode_read_string(dev_ofnode(dev), propname);

58
include/dm/read.h
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@ -64,6 +64,38 @@ int dev_read_u32(struct udevice *dev, const char *propname, u32 *outp);
*/
int dev_read_u32_default(struct udevice *dev, const char *propname, int def);
/**
* dev_read_s32() - read a signed 32-bit integer from a device's DT property
*
* @dev: device to read DT property from
* @propname: name of the property to read from
* @outp: place to put value (if found)
* @return 0 if OK, -ve on error
*/
int dev_read_s32(struct udevice *dev, const char *propname, s32 *outp);
/**
* dev_read_s32_default() - read a signed 32-bit int from a device's DT property
*
* @dev: device to read DT property from
* @propname: name of the property to read from
* @def: default value to return if the property has no value
* @return property value, or @def if not found
*/
int dev_read_s32_default(struct udevice *dev, const char *propname, int def);
/**
* dev_read_u32u() - read a 32-bit integer from a device's DT property
*
* This version uses a standard uint type.
*
* @dev: device to read DT property from
* @propname: name of the property to read from
* @outp: place to put value (if found)
* @return 0 if OK, -ve on error
*/
int dev_read_u32u(struct udevice *dev, const char *propname, uint *outp);
/**
* dev_read_string() - Read a string from a device's DT property
*
@ -492,6 +524,32 @@ static inline int dev_read_u32_default(struct udevice *dev,
return ofnode_read_u32_default(dev_ofnode(dev), propname, def);
}
static inline int dev_read_s32(struct udevice *dev,
const char *propname, s32 *outp)
{
return ofnode_read_s32(dev_ofnode(dev), propname, outp);
}
static inline int dev_read_s32_default(struct udevice *dev,
const char *propname, int def)
{
return ofnode_read_s32_default(dev_ofnode(dev), propname, def);
}
static inline int dev_read_u32u(struct udevice *dev,
const char *propname, uint *outp)
{
u32 val;
int ret;
ret = ofnode_read_u32(dev_ofnode(dev), propname, &val);
if (ret)
return ret;
*outp = val;
return 0;
}
static inline const char *dev_read_string(struct udevice *dev,
const char *propname)
{

35
test/dm/test-fdt.c
View File

@ -736,3 +736,38 @@ static int dm_test_first_child(struct unit_test_state *uts)
return 0;
}
DM_TEST(dm_test_first_child, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
/* Test integer functions in dm_read_...() */
static int dm_test_read_int(struct unit_test_state *uts)
{
struct udevice *dev;
u32 val32;
s32 sval;
uint val;
ut_assertok(uclass_first_device_err(UCLASS_TEST_FDT, &dev));
ut_asserteq_str("a-test", dev->name);
ut_assertok(dev_read_u32(dev, "int-value", &val32));
ut_asserteq(1234, val32);
ut_asserteq(-EINVAL, dev_read_u32(dev, "missing", &val32));
ut_asserteq(6, dev_read_u32_default(dev, "missing", 6));
ut_asserteq(1234, dev_read_u32_default(dev, "int-value", 6));
ut_asserteq(1234, val32);
ut_asserteq(-EINVAL, dev_read_s32(dev, "missing", &sval));
ut_asserteq(6, dev_read_s32_default(dev, "missing", 6));
ut_asserteq(-1234, dev_read_s32_default(dev, "uint-value", 6));
ut_assertok(dev_read_s32(dev, "uint-value", &sval));
ut_asserteq(-1234, sval);
val = 0;
ut_asserteq(-EINVAL, dev_read_u32u(dev, "missing", &val));
ut_assertok(dev_read_u32u(dev, "uint-value", &val));
ut_asserteq(-1234, val);
return 0;
}
DM_TEST(dm_test_read_int, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);