[openwrt/openwrt] bcm53xx: update NVMEM driver for NVRAM
LEDE Commits
lede-commits at lists.infradead.org
Wed Sep 14 05:22:03 PDT 2022
rmilecki pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/2f50c53f1772f24e4687e960e21c5b392fb522f0
commit 2f50c53f1772f24e4687e960e21c5b392fb522f0
Author: Rafał Miłecki <rafal at milecki.pl>
AuthorDate: Wed Sep 14 14:20:38 2022 +0200
bcm53xx: update NVMEM driver for NVRAM
Include support for NVMEM cells.
Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
---
...nvram-parse-NVRAM-content-into-NVMEM-cell.patch | 146 +++++++++++++++++++++
...nvram-find-Device-Tree-nodes-for-NVMEM-ce.patch | 38 ++++++
...nvram-provide-NVMEM-content-to-the-NVRAM-.patch | 10 +-
...nvram-parse-NVRAM-content-into-NVMEM-cell.patch | 146 +++++++++++++++++++++
...nvram-find-Device-Tree-nodes-for-NVMEM-ce.patch | 38 ++++++
...nvram-provide-NVMEM-content-to-the-NVRAM-.patch | 10 +-
...core-support-passing-DT-node-in-cell-info.patch | 41 ++++++
...core-support-passing-DT-node-in-cell-info.patch | 41 ++++++
8 files changed, 460 insertions(+), 10 deletions(-)
diff --git a/target/linux/bcm53xx/patches-5.10/081-v5.18-nvmem-brcm_nvram-parse-NVRAM-content-into-NVMEM-cell.patch b/target/linux/bcm53xx/patches-5.10/081-v5.18-nvmem-brcm_nvram-parse-NVRAM-content-into-NVMEM-cell.patch
new file mode 100644
index 0000000000..99781b3a7b
--- /dev/null
+++ b/target/linux/bcm53xx/patches-5.10/081-v5.18-nvmem-brcm_nvram-parse-NVRAM-content-into-NVMEM-cell.patch
@@ -0,0 +1,146 @@
+From 6e977eaa8280e957b87904b536661550f2a6b3e8 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal at milecki.pl>
+Date: Fri, 25 Feb 2022 17:58:20 +0000
+Subject: [PATCH] nvmem: brcm_nvram: parse NVRAM content into NVMEM cells
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+NVRAM consist of header and NUL separated key-value pairs. Parse it and
+create NVMEM cell for every key-value entry.
+
+Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
+Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla at linaro.org>
+Link: https://lore.kernel.org/r/20220225175822.8293-3-srinivas.kandagatla@linaro.org
+Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
+---
+ drivers/nvmem/brcm_nvram.c | 90 ++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 90 insertions(+)
+
+--- a/drivers/nvmem/brcm_nvram.c
++++ b/drivers/nvmem/brcm_nvram.c
+@@ -6,12 +6,26 @@
+ #include <linux/io.h>
+ #include <linux/mod_devicetable.h>
+ #include <linux/module.h>
++#include <linux/nvmem-consumer.h>
+ #include <linux/nvmem-provider.h>
+ #include <linux/platform_device.h>
++#include <linux/slab.h>
++
++#define NVRAM_MAGIC "FLSH"
+
+ struct brcm_nvram {
+ struct device *dev;
+ void __iomem *base;
++ struct nvmem_cell_info *cells;
++ int ncells;
++};
++
++struct brcm_nvram_header {
++ char magic[4];
++ __le32 len;
++ __le32 crc_ver_init; /* 0:7 crc, 8:15 ver, 16:31 sdram_init */
++ __le32 config_refresh; /* 0:15 sdram_config, 16:31 sdram_refresh */
++ __le32 config_ncdl; /* ncdl values for memc */
+ };
+
+ static int brcm_nvram_read(void *context, unsigned int offset, void *val,
+@@ -26,6 +40,75 @@ static int brcm_nvram_read(void *context
+ return 0;
+ }
+
++static int brcm_nvram_add_cells(struct brcm_nvram *priv, uint8_t *data,
++ size_t len)
++{
++ struct device *dev = priv->dev;
++ char *var, *value, *eq;
++ int idx;
++
++ priv->ncells = 0;
++ for (var = data + sizeof(struct brcm_nvram_header);
++ var < (char *)data + len && *var;
++ var += strlen(var) + 1) {
++ priv->ncells++;
++ }
++
++ priv->cells = devm_kcalloc(dev, priv->ncells, sizeof(*priv->cells), GFP_KERNEL);
++ if (!priv->cells)
++ return -ENOMEM;
++
++ for (var = data + sizeof(struct brcm_nvram_header), idx = 0;
++ var < (char *)data + len && *var;
++ var = value + strlen(value) + 1, idx++) {
++ eq = strchr(var, '=');
++ if (!eq)
++ break;
++ *eq = '\0';
++ value = eq + 1;
++
++ priv->cells[idx].name = devm_kstrdup(dev, var, GFP_KERNEL);
++ if (!priv->cells[idx].name)
++ return -ENOMEM;
++ priv->cells[idx].offset = value - (char *)data;
++ priv->cells[idx].bytes = strlen(value);
++ }
++
++ return 0;
++}
++
++static int brcm_nvram_parse(struct brcm_nvram *priv)
++{
++ struct device *dev = priv->dev;
++ struct brcm_nvram_header header;
++ uint8_t *data;
++ size_t len;
++ int err;
++
++ memcpy_fromio(&header, priv->base, sizeof(header));
++
++ if (memcmp(header.magic, NVRAM_MAGIC, 4)) {
++ dev_err(dev, "Invalid NVRAM magic\n");
++ return -EINVAL;
++ }
++
++ len = le32_to_cpu(header.len);
++
++ data = kcalloc(1, len, GFP_KERNEL);
++ memcpy_fromio(data, priv->base, len);
++ data[len - 1] = '\0';
++
++ err = brcm_nvram_add_cells(priv, data, len);
++ if (err) {
++ dev_err(dev, "Failed to add cells: %d\n", err);
++ return err;
++ }
++
++ kfree(data);
++
++ return 0;
++}
++
+ static int brcm_nvram_probe(struct platform_device *pdev)
+ {
+ struct nvmem_config config = {
+@@ -35,6 +118,7 @@ static int brcm_nvram_probe(struct platf
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ struct brcm_nvram *priv;
++ int err;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+@@ -46,7 +130,13 @@ static int brcm_nvram_probe(struct platf
+ if (IS_ERR(priv->base))
+ return PTR_ERR(priv->base);
+
++ err = brcm_nvram_parse(priv);
++ if (err)
++ return err;
++
+ config.dev = dev;
++ config.cells = priv->cells;
++ config.ncells = priv->ncells;
+ config.priv = priv;
+ config.size = resource_size(res);
+
diff --git a/target/linux/bcm53xx/patches-5.10/082-v5.19-nvmem-brcm_nvram-find-Device-Tree-nodes-for-NVMEM-ce.patch b/target/linux/bcm53xx/patches-5.10/082-v5.19-nvmem-brcm_nvram-find-Device-Tree-nodes-for-NVMEM-ce.patch
new file mode 100644
index 0000000000..a9eacd9419
--- /dev/null
+++ b/target/linux/bcm53xx/patches-5.10/082-v5.19-nvmem-brcm_nvram-find-Device-Tree-nodes-for-NVMEM-ce.patch
@@ -0,0 +1,38 @@
+From 207775f7e17b8fd0426a2ac4a5b81e4e1d71849e Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal at milecki.pl>
+Date: Fri, 29 Apr 2022 17:26:47 +0100
+Subject: [PATCH] nvmem: brcm_nvram: find Device Tree nodes for NVMEM cells
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+DT binding for Broadcom's NVRAM supports specifying NVMEM cells as NVMEM
+device (provider) subnodes. Look for such subnodes when collecing NVMEM
+cells. This allows NVMEM consumers to use NVRAM variables.
+
+Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
+Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla at linaro.org>
+Link: https://lore.kernel.org/r/20220429162701.2222-3-srinivas.kandagatla@linaro.org
+Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
+---
+ drivers/nvmem/brcm_nvram.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/drivers/nvmem/brcm_nvram.c
++++ b/drivers/nvmem/brcm_nvram.c
+@@ -8,6 +8,7 @@
+ #include <linux/module.h>
+ #include <linux/nvmem-consumer.h>
+ #include <linux/nvmem-provider.h>
++#include <linux/of.h>
+ #include <linux/platform_device.h>
+ #include <linux/slab.h>
+
+@@ -72,6 +73,7 @@ static int brcm_nvram_add_cells(struct b
+ return -ENOMEM;
+ priv->cells[idx].offset = value - (char *)data;
+ priv->cells[idx].bytes = strlen(value);
++ priv->cells[idx].np = of_get_child_by_name(dev->of_node, priv->cells[idx].name);
+ }
+
+ return 0;
diff --git a/target/linux/bcm53xx/patches-5.10/800-0002-nvmem-brcm_nvram-provide-NVMEM-content-to-the-NVRAM-.patch b/target/linux/bcm53xx/patches-5.10/800-0002-nvmem-brcm_nvram-provide-NVMEM-content-to-the-NVRAM-.patch
index cf5952ad5f..ecc5f3974e 100644
--- a/target/linux/bcm53xx/patches-5.10/800-0002-nvmem-brcm_nvram-provide-NVMEM-content-to-the-NVRAM-.patch
+++ b/target/linux/bcm53xx/patches-5.10/800-0002-nvmem-brcm_nvram-provide-NVMEM-content-to-the-NVRAM-.patch
@@ -20,12 +20,12 @@ Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
#include <linux/io.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
-@@ -46,6 +47,8 @@ static int brcm_nvram_probe(struct platf
- if (IS_ERR(priv->base))
- return PTR_ERR(priv->base);
+@@ -136,6 +137,8 @@ static int brcm_nvram_probe(struct platf
+ if (err)
+ return err;
+ bcm47xx_nvram_init_from_iomem(priv->base, resource_size(res));
+
config.dev = dev;
- config.priv = priv;
- config.size = resource_size(res);
+ config.cells = priv->cells;
+ config.ncells = priv->ncells;
diff --git a/target/linux/bcm53xx/patches-5.15/080-v5.18-nvmem-brcm_nvram-parse-NVRAM-content-into-NVMEM-cell.patch b/target/linux/bcm53xx/patches-5.15/080-v5.18-nvmem-brcm_nvram-parse-NVRAM-content-into-NVMEM-cell.patch
new file mode 100644
index 0000000000..99781b3a7b
--- /dev/null
+++ b/target/linux/bcm53xx/patches-5.15/080-v5.18-nvmem-brcm_nvram-parse-NVRAM-content-into-NVMEM-cell.patch
@@ -0,0 +1,146 @@
+From 6e977eaa8280e957b87904b536661550f2a6b3e8 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal at milecki.pl>
+Date: Fri, 25 Feb 2022 17:58:20 +0000
+Subject: [PATCH] nvmem: brcm_nvram: parse NVRAM content into NVMEM cells
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+NVRAM consist of header and NUL separated key-value pairs. Parse it and
+create NVMEM cell for every key-value entry.
+
+Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
+Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla at linaro.org>
+Link: https://lore.kernel.org/r/20220225175822.8293-3-srinivas.kandagatla@linaro.org
+Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
+---
+ drivers/nvmem/brcm_nvram.c | 90 ++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 90 insertions(+)
+
+--- a/drivers/nvmem/brcm_nvram.c
++++ b/drivers/nvmem/brcm_nvram.c
+@@ -6,12 +6,26 @@
+ #include <linux/io.h>
+ #include <linux/mod_devicetable.h>
+ #include <linux/module.h>
++#include <linux/nvmem-consumer.h>
+ #include <linux/nvmem-provider.h>
+ #include <linux/platform_device.h>
++#include <linux/slab.h>
++
++#define NVRAM_MAGIC "FLSH"
+
+ struct brcm_nvram {
+ struct device *dev;
+ void __iomem *base;
++ struct nvmem_cell_info *cells;
++ int ncells;
++};
++
++struct brcm_nvram_header {
++ char magic[4];
++ __le32 len;
++ __le32 crc_ver_init; /* 0:7 crc, 8:15 ver, 16:31 sdram_init */
++ __le32 config_refresh; /* 0:15 sdram_config, 16:31 sdram_refresh */
++ __le32 config_ncdl; /* ncdl values for memc */
+ };
+
+ static int brcm_nvram_read(void *context, unsigned int offset, void *val,
+@@ -26,6 +40,75 @@ static int brcm_nvram_read(void *context
+ return 0;
+ }
+
++static int brcm_nvram_add_cells(struct brcm_nvram *priv, uint8_t *data,
++ size_t len)
++{
++ struct device *dev = priv->dev;
++ char *var, *value, *eq;
++ int idx;
++
++ priv->ncells = 0;
++ for (var = data + sizeof(struct brcm_nvram_header);
++ var < (char *)data + len && *var;
++ var += strlen(var) + 1) {
++ priv->ncells++;
++ }
++
++ priv->cells = devm_kcalloc(dev, priv->ncells, sizeof(*priv->cells), GFP_KERNEL);
++ if (!priv->cells)
++ return -ENOMEM;
++
++ for (var = data + sizeof(struct brcm_nvram_header), idx = 0;
++ var < (char *)data + len && *var;
++ var = value + strlen(value) + 1, idx++) {
++ eq = strchr(var, '=');
++ if (!eq)
++ break;
++ *eq = '\0';
++ value = eq + 1;
++
++ priv->cells[idx].name = devm_kstrdup(dev, var, GFP_KERNEL);
++ if (!priv->cells[idx].name)
++ return -ENOMEM;
++ priv->cells[idx].offset = value - (char *)data;
++ priv->cells[idx].bytes = strlen(value);
++ }
++
++ return 0;
++}
++
++static int brcm_nvram_parse(struct brcm_nvram *priv)
++{
++ struct device *dev = priv->dev;
++ struct brcm_nvram_header header;
++ uint8_t *data;
++ size_t len;
++ int err;
++
++ memcpy_fromio(&header, priv->base, sizeof(header));
++
++ if (memcmp(header.magic, NVRAM_MAGIC, 4)) {
++ dev_err(dev, "Invalid NVRAM magic\n");
++ return -EINVAL;
++ }
++
++ len = le32_to_cpu(header.len);
++
++ data = kcalloc(1, len, GFP_KERNEL);
++ memcpy_fromio(data, priv->base, len);
++ data[len - 1] = '\0';
++
++ err = brcm_nvram_add_cells(priv, data, len);
++ if (err) {
++ dev_err(dev, "Failed to add cells: %d\n", err);
++ return err;
++ }
++
++ kfree(data);
++
++ return 0;
++}
++
+ static int brcm_nvram_probe(struct platform_device *pdev)
+ {
+ struct nvmem_config config = {
+@@ -35,6 +118,7 @@ static int brcm_nvram_probe(struct platf
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ struct brcm_nvram *priv;
++ int err;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+@@ -46,7 +130,13 @@ static int brcm_nvram_probe(struct platf
+ if (IS_ERR(priv->base))
+ return PTR_ERR(priv->base);
+
++ err = brcm_nvram_parse(priv);
++ if (err)
++ return err;
++
+ config.dev = dev;
++ config.cells = priv->cells;
++ config.ncells = priv->ncells;
+ config.priv = priv;
+ config.size = resource_size(res);
+
diff --git a/target/linux/bcm53xx/patches-5.15/081-v5.19-nvmem-brcm_nvram-find-Device-Tree-nodes-for-NVMEM-ce.patch b/target/linux/bcm53xx/patches-5.15/081-v5.19-nvmem-brcm_nvram-find-Device-Tree-nodes-for-NVMEM-ce.patch
new file mode 100644
index 0000000000..a9eacd9419
--- /dev/null
+++ b/target/linux/bcm53xx/patches-5.15/081-v5.19-nvmem-brcm_nvram-find-Device-Tree-nodes-for-NVMEM-ce.patch
@@ -0,0 +1,38 @@
+From 207775f7e17b8fd0426a2ac4a5b81e4e1d71849e Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal at milecki.pl>
+Date: Fri, 29 Apr 2022 17:26:47 +0100
+Subject: [PATCH] nvmem: brcm_nvram: find Device Tree nodes for NVMEM cells
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+DT binding for Broadcom's NVRAM supports specifying NVMEM cells as NVMEM
+device (provider) subnodes. Look for such subnodes when collecing NVMEM
+cells. This allows NVMEM consumers to use NVRAM variables.
+
+Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
+Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla at linaro.org>
+Link: https://lore.kernel.org/r/20220429162701.2222-3-srinivas.kandagatla@linaro.org
+Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
+---
+ drivers/nvmem/brcm_nvram.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/drivers/nvmem/brcm_nvram.c
++++ b/drivers/nvmem/brcm_nvram.c
+@@ -8,6 +8,7 @@
+ #include <linux/module.h>
+ #include <linux/nvmem-consumer.h>
+ #include <linux/nvmem-provider.h>
++#include <linux/of.h>
+ #include <linux/platform_device.h>
+ #include <linux/slab.h>
+
+@@ -72,6 +73,7 @@ static int brcm_nvram_add_cells(struct b
+ return -ENOMEM;
+ priv->cells[idx].offset = value - (char *)data;
+ priv->cells[idx].bytes = strlen(value);
++ priv->cells[idx].np = of_get_child_by_name(dev->of_node, priv->cells[idx].name);
+ }
+
+ return 0;
diff --git a/target/linux/bcm53xx/patches-5.15/800-0002-nvmem-brcm_nvram-provide-NVMEM-content-to-the-NVRAM-.patch b/target/linux/bcm53xx/patches-5.15/800-0002-nvmem-brcm_nvram-provide-NVMEM-content-to-the-NVRAM-.patch
index cf5952ad5f..ecc5f3974e 100644
--- a/target/linux/bcm53xx/patches-5.15/800-0002-nvmem-brcm_nvram-provide-NVMEM-content-to-the-NVRAM-.patch
+++ b/target/linux/bcm53xx/patches-5.15/800-0002-nvmem-brcm_nvram-provide-NVMEM-content-to-the-NVRAM-.patch
@@ -20,12 +20,12 @@ Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
#include <linux/io.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
-@@ -46,6 +47,8 @@ static int brcm_nvram_probe(struct platf
- if (IS_ERR(priv->base))
- return PTR_ERR(priv->base);
+@@ -136,6 +137,8 @@ static int brcm_nvram_probe(struct platf
+ if (err)
+ return err;
+ bcm47xx_nvram_init_from_iomem(priv->base, resource_size(res));
+
config.dev = dev;
- config.priv = priv;
- config.size = resource_size(res);
+ config.cells = priv->cells;
+ config.ncells = priv->ncells;
diff --git a/target/linux/generic/backport-5.10/802-v5.19-nvmem-core-support-passing-DT-node-in-cell-info.patch b/target/linux/generic/backport-5.10/802-v5.19-nvmem-core-support-passing-DT-node-in-cell-info.patch
new file mode 100644
index 0000000000..b7870eef4b
--- /dev/null
+++ b/target/linux/generic/backport-5.10/802-v5.19-nvmem-core-support-passing-DT-node-in-cell-info.patch
@@ -0,0 +1,41 @@
+From dbc2f62061c6bfba0aee93161ee3194dcee84bd0 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal at milecki.pl>
+Date: Fri, 29 Apr 2022 17:26:46 +0100
+Subject: [PATCH] nvmem: core: support passing DT node in cell info
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Some hardware may have NVMEM cells described in Device Tree using
+individual nodes. Let drivers pass such nodes to the NVMEM subsystem so
+they can be later used by NVMEM consumers.
+
+Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
+Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla at linaro.org>
+Link: https://lore.kernel.org/r/20220429162701.2222-2-srinivas.kandagatla@linaro.org
+Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
+---
+ drivers/nvmem/core.c | 1 +
+ include/linux/nvmem-consumer.h | 1 +
+ 2 files changed, 2 insertions(+)
+
+--- a/drivers/nvmem/core.c
++++ b/drivers/nvmem/core.c
+@@ -374,6 +374,7 @@ static int nvmem_cell_info_to_nvmem_cell
+
+ cell->bit_offset = info->bit_offset;
+ cell->nbits = info->nbits;
++ cell->np = info->np;
+
+ if (cell->nbits)
+ cell->bytes = DIV_ROUND_UP(cell->nbits + cell->bit_offset,
+--- a/include/linux/nvmem-consumer.h
++++ b/include/linux/nvmem-consumer.h
+@@ -25,6 +25,7 @@ struct nvmem_cell_info {
+ unsigned int bytes;
+ unsigned int bit_offset;
+ unsigned int nbits;
++ struct device_node *np;
+ };
+
+ /**
diff --git a/target/linux/generic/backport-5.15/803-v5.19-nvmem-core-support-passing-DT-node-in-cell-info.patch b/target/linux/generic/backport-5.15/803-v5.19-nvmem-core-support-passing-DT-node-in-cell-info.patch
new file mode 100644
index 0000000000..1acc6947fe
--- /dev/null
+++ b/target/linux/generic/backport-5.15/803-v5.19-nvmem-core-support-passing-DT-node-in-cell-info.patch
@@ -0,0 +1,41 @@
+From dbc2f62061c6bfba0aee93161ee3194dcee84bd0 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal at milecki.pl>
+Date: Fri, 29 Apr 2022 17:26:46 +0100
+Subject: [PATCH] nvmem: core: support passing DT node in cell info
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Some hardware may have NVMEM cells described in Device Tree using
+individual nodes. Let drivers pass such nodes to the NVMEM subsystem so
+they can be later used by NVMEM consumers.
+
+Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
+Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla at linaro.org>
+Link: https://lore.kernel.org/r/20220429162701.2222-2-srinivas.kandagatla@linaro.org
+Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
+---
+ drivers/nvmem/core.c | 1 +
+ include/linux/nvmem-consumer.h | 1 +
+ 2 files changed, 2 insertions(+)
+
+--- a/drivers/nvmem/core.c
++++ b/drivers/nvmem/core.c
+@@ -462,6 +462,7 @@ static int nvmem_cell_info_to_nvmem_cell
+
+ cell->bit_offset = info->bit_offset;
+ cell->nbits = info->nbits;
++ cell->np = info->np;
+
+ if (cell->nbits)
+ cell->bytes = DIV_ROUND_UP(cell->nbits + cell->bit_offset,
+--- a/include/linux/nvmem-consumer.h
++++ b/include/linux/nvmem-consumer.h
+@@ -25,6 +25,7 @@ struct nvmem_cell_info {
+ unsigned int bytes;
+ unsigned int bit_offset;
+ unsigned int nbits;
++ struct device_node *np;
+ };
+
+ /**
More information about the lede-commits
mailing list