From b649b0bf7100bdc6adb7e857c74738cab7c47b4c Mon Sep 17 00:00:00 2001 From: =?utf8?q?Rafa=C5=82=20Mi=C5=82ecki?= Date: Thu, 13 Jul 2023 19:39:42 +0200 Subject: [PATCH] kernel: nvmem: fix "fixed-layout" & support "mac-base" MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit DT binding for MAC cells in fixed layout was upstream approved and accepted. Add support for it. This can replace quite some of our downstream hacks. Signed-off-by: Rafał Miłecki (cherry picked from commit 61f674df4f0ce2b1c53b0b7f6b0c1d03d99838c0) --- ...support-for-fixed-cells-NVMEM-layout.patch | 40 ++++++++ ...-support-mac-base-fixed-layout-cells.patch | 93 +++++++++++++++++++ 2 files changed, 133 insertions(+) create mode 100644 target/linux/generic/pending-5.15/803-nvmem-core-fix-support-for-fixed-cells-NVMEM-layout.patch create mode 100644 target/linux/generic/pending-5.15/804-nvmem-core-support-mac-base-fixed-layout-cells.patch diff --git a/target/linux/generic/pending-5.15/803-nvmem-core-fix-support-for-fixed-cells-NVMEM-layout.patch b/target/linux/generic/pending-5.15/803-nvmem-core-fix-support-for-fixed-cells-NVMEM-layout.patch new file mode 100644 index 0000000000..f77756b9cf --- /dev/null +++ b/target/linux/generic/pending-5.15/803-nvmem-core-fix-support-for-fixed-cells-NVMEM-layout.patch @@ -0,0 +1,40 @@ +From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= +Date: Thu, 13 Jul 2023 17:30:59 +0200 +Subject: [PATCH] nvmem: core: fix support for fixed cells NVMEM layout +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +Returning -EPROBE_DEFER for "fixed-layout" makes nvmem_register() always +fail (that layout is supported internally with no external module). That +makes callers (e.g. mtd_nvmem_add()) fail as well and prevents booting +on devices with "fixed-layout" in DT. + +Add a quick workaround for it. + +Fixes: 6468a6f45148 ("nvmem: core: handle the absence of expected layouts") +Signed-off-by: Rafał Miłecki +--- + +--- a/drivers/nvmem/core.c ++++ b/drivers/nvmem/core.c +@@ -794,6 +794,19 @@ static struct nvmem_layout *nvmem_layout + return NULL; + + /* ++ * We should return -EPROBE_DEFER only when layout driver is expected to ++ * become available later. Otherwise NVMEM will never probe successfully ++ * for unsupported layouts. There is no known solution for that right ++ * now. ++ * ++ * This problem also affects "fixed-layout". It's supported in NVMEM ++ * core code so there never will be layout for it. We shouldn't return ++ * -EPROBE_DEFER in such case. Add a quick workaround for that. ++ */ ++ if (of_device_is_compatible(layout_np, "fixed-layout")) ++ return NULL; ++ ++ /* + * In case the nvmem device was built-in while the layout was built as a + * module, we shall manually request the layout driver loading otherwise + * we'll never have any match. diff --git a/target/linux/generic/pending-5.15/804-nvmem-core-support-mac-base-fixed-layout-cells.patch b/target/linux/generic/pending-5.15/804-nvmem-core-support-mac-base-fixed-layout-cells.patch new file mode 100644 index 0000000000..6791b63ac0 --- /dev/null +++ b/target/linux/generic/pending-5.15/804-nvmem-core-support-mac-base-fixed-layout-cells.patch @@ -0,0 +1,93 @@ +From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= +Date: Thu, 13 Jul 2023 18:29:19 +0200 +Subject: [PATCH] nvmem: core: support "mac-base" fixed layout cells + +Fixed layout binding allows specifying "mac-base" NVMEM cells. It's used +for base MAC address (that can be used for calculating relative +addresses). It can be stored in a raw binary format or as an ASCII +string. +--- + +--- a/drivers/nvmem/Kconfig ++++ b/drivers/nvmem/Kconfig +@@ -1,6 +1,7 @@ + # SPDX-License-Identifier: GPL-2.0-only + menuconfig NVMEM + bool "NVMEM Support" ++ select GENERIC_NET_UTILS + help + Support for NVMEM(Non Volatile Memory) devices like EEPROM, EFUSES... + +--- a/drivers/nvmem/core.c ++++ b/drivers/nvmem/core.c +@@ -7,9 +7,11 @@ + */ + + #include ++#include + #include + #include + #include ++#include + #include + #include + #include +@@ -696,6 +698,37 @@ static int nvmem_validate_keepouts(struc + return 0; + } + ++static int nvmem_mac_base_raw_read(void *context, const char *id, int index, unsigned int offset, ++ void *buf, size_t bytes) ++{ ++ if (WARN_ON(bytes != ETH_ALEN)) ++ return -EINVAL; ++ ++ if (index) ++ eth_addr_add(buf, index); ++ ++ return 0; ++} ++ ++static int nvmem_mac_base_ascii_read(void *context, const char *id, int index, unsigned int offset, ++ void *buf, size_t bytes) ++{ ++ u8 mac[ETH_ALEN]; ++ ++ if (WARN_ON(bytes != 3 * ETH_ALEN - 1)) ++ return -EINVAL; ++ ++ if (!mac_pton(buf, mac)) ++ return -EINVAL; ++ ++ if (index) ++ eth_addr_add(mac, index); ++ ++ ether_addr_copy(buf, mac); ++ ++ return 0; ++} ++ + static int nvmem_add_cells_from_dt(struct nvmem_device *nvmem, struct device_node *np) + { + struct nvmem_layout *layout = nvmem->layout; +@@ -731,6 +764,20 @@ static int nvmem_add_cells_from_dt(struc + if (layout && layout->fixup_cell_info) + layout->fixup_cell_info(nvmem, layout, &info); + ++ if (of_device_is_compatible(np, "fixed-layout")) { ++ if (of_device_is_compatible(child, "mac-base")) { ++ if (info.bytes == 6) { ++ info.raw_len = info.bytes; ++ info.bytes = ETH_ALEN; ++ info.read_post_process = nvmem_mac_base_raw_read; ++ } else if (info.bytes == 3 * ETH_ALEN - 1) { ++ info.raw_len = info.bytes; ++ info.bytes = ETH_ALEN; ++ info.read_post_process = nvmem_mac_base_ascii_read; ++ } ++ } ++ } ++ + ret = nvmem_add_one_cell(nvmem, &info); + kfree(info.name); + if (ret) { -- 2.30.2