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@amd.com Signed-off-by: Ashok Reddy Soma ashok.reddy.soma@amd.com Signed-off-by: Michal Simek michal.simek@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);