[PATCH v2] dm: core: support reading a single indexed u64 value
Michal Simek
michal.simek at amd.com
Fri Aug 25 11:37:46 CEST 2023
Add helper function to allow reading a single indexed u64 value from a
device-tree property containing multiple u64 values, that is an array of
u64's.
Co-developed-by: Ashok Reddy Soma <ashok.reddy.soma at amd.com>
Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma at amd.com>
Signed-off-by: Michal Simek <michal.simek at amd.com>
---
Changes in v2:
- fix kernel-doc for of_read_u64_index()
- add missing test reported by Simon
- fix debug print to print 64bit value
- convert of_read_u64 to use of_read_u64_index() as is done also for u32 version
- fix overflow size calculation
Tested on sandbox:
make defconfig && make -j8 && ./u-boot --fdt arch/sandbox/dts/test.dtb --command "ut dm ofnode_u64" -v
Test: dm_test_ofnode_u64: ofnode.c
Test: dm_test_ofnode_u64: ofnode.c (flat tree)
Failures: 0
Based on v2023.07 tag.
---
arch/sandbox/dts/test.dts | 1 +
drivers/core/of_access.c | 16 ++++++++++++----
drivers/core/ofnode.c | 30 ++++++++++++++++++++++++++++++
include/dm/of_access.h | 19 +++++++++++++++++++
include/dm/ofnode.h | 12 ++++++++++++
test/dm/ofnode.c | 8 ++++++++
6 files changed, 82 insertions(+), 4 deletions(-)
diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts
index ff9f9222e6f9..a3c12bb09874 100644
--- a/arch/sandbox/dts/test.dts
+++ b/arch/sandbox/dts/test.dts
@@ -288,6 +288,7 @@
uint-value = <(-1234)>;
int64-value = /bits/ 64 <0x1111222233334444>;
int-array = <5678 9123 4567>;
+ int64-array = /bits/ 64 <0x1111222233334444 0x4444333322221111>;
str-value = "test string";
interrupts-extended = <&irq 3 0>;
acpi,name = "GHIJ";
diff --git a/drivers/core/of_access.c b/drivers/core/of_access.c
index 81a307992c01..1d5348bf2f50 100644
--- a/drivers/core/of_access.c
+++ b/drivers/core/of_access.c
@@ -570,26 +570,34 @@ int of_read_u32_index(const struct device_node *np, const char *propname,
return 0;
}
-int of_read_u64(const struct device_node *np, const char *propname, u64 *outp)
+int of_read_u64_index(const struct device_node *np, const char *propname,
+ int index, u64 *outp)
{
const __be64 *val;
debug("%s: %s: ", __func__, propname);
if (!np)
return -EINVAL;
- val = of_find_property_value_of_size(np, propname, sizeof(*outp));
+
+ val = of_find_property_value_of_size(np, propname,
+ sizeof(*outp) * (index + 1));
if (IS_ERR(val)) {
debug("(not found)\n");
return PTR_ERR(val);
}
- *outp = be64_to_cpup(val);
+ *outp = be64_to_cpup(val + index);
debug("%#llx (%lld)\n", (unsigned long long)*outp,
- (unsigned long long)*outp);
+ (unsigned long long)*outp);
return 0;
}
+int of_read_u64(const struct device_node *np, const char *propname, u64 *outp)
+{
+ return of_read_u64_index(np, propname, 0, outp);
+}
+
int of_property_match_string(const struct device_node *np, const char *propname,
const char *string)
{
diff --git a/drivers/core/ofnode.c b/drivers/core/ofnode.c
index ec574c446079..e973c74af4cf 100644
--- a/drivers/core/ofnode.c
+++ b/drivers/core/ofnode.c
@@ -319,6 +319,36 @@ int ofnode_read_u32_index(ofnode node, const char *propname, int index,
return 0;
}
+int ofnode_read_u64_index(ofnode node, const char *propname, int index,
+ u64 *outp)
+{
+ const fdt64_t *cell;
+ int len;
+
+ assert(ofnode_valid(node));
+
+ if (ofnode_is_np(node))
+ return of_read_u64_index(ofnode_to_np(node), propname, index,
+ outp);
+
+ cell = fdt_getprop(ofnode_to_fdt(node), ofnode_to_offset(node),
+ propname, &len);
+ if (!cell) {
+ debug("(not found)\n");
+ return -EINVAL;
+ }
+
+ if (len < (sizeof(u64) * (index + 1))) {
+ debug("(not large enough)\n");
+ return -EOVERFLOW;
+ }
+
+ *outp = fdt64_to_cpu(cell[index]);
+ debug("%#llx (%lld)\n", *outp, *outp);
+
+ return 0;
+}
+
u32 ofnode_read_u32_index_default(ofnode node, const char *propname, int index,
u32 def)
{
diff --git a/include/dm/of_access.h b/include/dm/of_access.h
index c556a18f7d9c..9361d0a87bfb 100644
--- a/include/dm/of_access.h
+++ b/include/dm/of_access.h
@@ -333,6 +333,25 @@ int of_read_u32(const struct device_node *np, const char *propname, u32 *outp);
int of_read_u32_index(const struct device_node *np, const char *propname,
int index, u32 *outp);
+/**
+ * of_read_u64_index() - Find and read a 64-bit value from a multi-value
+ * property
+ *
+ * @np: device node from which the property value is to be read.
+ * @propname: name of the property to be searched.
+ * @index: index of the u32 in the list of values
+ * @outp: pointer to return value, modified only if return value is 0.
+ *
+ * Search for a property in a device node and read a 64-bit value from
+ * it.
+ *
+ * Return:
+ * 0 on success, -EINVAL if the property does not exist, or -EOVERFLOW if the
+ * property data isn't large enough.
+ */
+int of_read_u64_index(const struct device_node *np, const char *propname,
+ int index, u64 *outp);
+
/**
* of_read_u64() - Find and read a 64-bit integer from a property
*
diff --git a/include/dm/ofnode.h b/include/dm/ofnode.h
index 443db6252ddc..c5c244c6a476 100644
--- a/include/dm/ofnode.h
+++ b/include/dm/ofnode.h
@@ -424,6 +424,18 @@ int ofnode_read_u32(ofnode node, const char *propname, u32 *outp);
int ofnode_read_u32_index(ofnode node, const char *propname, int index,
u32 *outp);
+/**
+ * ofnode_read_u64_index() - Read a 64-bit integer from a multi-value property
+ *
+ * @node: valid node reference to read property from
+ * @propname: name of the property to read from
+ * @index: index of the integer to return
+ * @outp: place to put value (if found)
+ * Return: 0 if OK, -ve on error
+ */
+int ofnode_read_u64_index(ofnode node, const char *propname, int index,
+ u64 *outp);
+
/**
* ofnode_read_s32() - Read a 32-bit integer from a property
*
diff --git a/test/dm/ofnode.c b/test/dm/ofnode.c
index 473a8cef5780..08b6721e926b 100644
--- a/test/dm/ofnode.c
+++ b/test/dm/ofnode.c
@@ -967,6 +967,14 @@ static int dm_test_ofnode_u64(struct unit_test_state *uts)
ut_asserteq_64(0x1111222233334444, val);
ut_asserteq(-EINVAL, ofnode_read_u64(node, "missing", &val));
+ ut_assertok(ofnode_read_u64_index(node, "int64-array", 0, &val));
+ ut_asserteq_64(0x1111222233334444, val);
+ ut_assertok(ofnode_read_u64_index(node, "int64-array", 1, &val));
+ ut_asserteq_64(0x4444333322221111, val);
+ ut_asserteq(-EOVERFLOW,
+ ofnode_read_u64_index(node, "int64-array", 2, &val));
+ ut_asserteq(-EINVAL, ofnode_read_u64_index(node, "missing", 0, &val));
+
return 0;
}
DM_TEST(dm_test_ofnode_u64, UT_TESTF_SCAN_FDT);
--
2.36.1
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