diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-4.19/950-0338-nvmem-add-type-attribute.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-4.19/950-0338-nvmem-add-type-attribute.patch | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-4.19/950-0338-nvmem-add-type-attribute.patch b/target/linux/bcm27xx/patches-4.19/950-0338-nvmem-add-type-attribute.patch new file mode 100644 index 0000000000..661ba8e33d --- /dev/null +++ b/target/linux/bcm27xx/patches-4.19/950-0338-nvmem-add-type-attribute.patch @@ -0,0 +1,131 @@ +From c9e76146066660a2884e61216c1ce227cf509bf8 Mon Sep 17 00:00:00 2001 +From: Alexandre Belloni <alexandre.belloni@bootlin.com> +Date: Fri, 30 Nov 2018 11:53:20 +0000 +Subject: [PATCH] nvmem: add type attribute + +commit 16688453661b6d5159be558a1f8c1f54463a420f upstream. + +Add a type attribute so userspace is able to know how the data is stored as +this can help taking the correct decision when selecting which device to +use. This will also help program display the proper warnings when burning +fuses for example. + +Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> +Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> +Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> +--- + drivers/nvmem/core.c | 21 +++++++++++++++++++++ + include/linux/nvmem-provider.h | 16 ++++++++++++++++ + 2 files changed, 37 insertions(+) + +--- a/drivers/nvmem/core.c ++++ b/drivers/nvmem/core.c +@@ -36,6 +36,7 @@ struct nvmem_device { + size_t size; + bool read_only; + int flags; ++ enum nvmem_type type; + struct bin_attribute eeprom; + struct device *base_dev; + nvmem_reg_read_t reg_read; +@@ -84,6 +85,21 @@ static int nvmem_reg_write(struct nvmem_ + return -EINVAL; + } + ++static ssize_t type_show(struct device *dev, ++ struct device_attribute *attr, char *buf) ++{ ++ struct nvmem_device *nvmem = to_nvmem_device(dev); ++ ++ return sprintf(buf, "%s\n", nvmem_type_str[nvmem->type]); ++} ++ ++static DEVICE_ATTR_RO(type); ++ ++static struct attribute *nvmem_attrs[] = { ++ &dev_attr_type.attr, ++ NULL, ++}; ++ + static ssize_t bin_attr_nvmem_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *attr, + char *buf, loff_t pos, size_t count) +@@ -169,6 +185,7 @@ static struct bin_attribute *nvmem_bin_r + + static const struct attribute_group nvmem_bin_rw_group = { + .bin_attrs = nvmem_bin_rw_attributes, ++ .attrs = nvmem_attrs, + }; + + static const struct attribute_group *nvmem_rw_dev_groups[] = { +@@ -192,6 +209,7 @@ static struct bin_attribute *nvmem_bin_r + + static const struct attribute_group nvmem_bin_ro_group = { + .bin_attrs = nvmem_bin_ro_attributes, ++ .attrs = nvmem_attrs, + }; + + static const struct attribute_group *nvmem_ro_dev_groups[] = { +@@ -216,6 +234,7 @@ static struct bin_attribute *nvmem_bin_r + + static const struct attribute_group nvmem_bin_rw_root_group = { + .bin_attrs = nvmem_bin_rw_root_attributes, ++ .attrs = nvmem_attrs, + }; + + static const struct attribute_group *nvmem_rw_root_dev_groups[] = { +@@ -239,6 +258,7 @@ static struct bin_attribute *nvmem_bin_r + + static const struct attribute_group nvmem_bin_ro_root_group = { + .bin_attrs = nvmem_bin_ro_root_attributes, ++ .attrs = nvmem_attrs, + }; + + static const struct attribute_group *nvmem_ro_root_dev_groups[] = { +@@ -485,6 +505,7 @@ struct nvmem_device *nvmem_register(cons + nvmem->dev.bus = &nvmem_bus_type; + nvmem->dev.parent = config->dev; + nvmem->priv = config->priv; ++ nvmem->type = config->type; + nvmem->reg_read = config->reg_read; + nvmem->reg_write = config->reg_write; + nvmem->dev.of_node = config->dev->of_node; +--- a/include/linux/nvmem-provider.h ++++ b/include/linux/nvmem-provider.h +@@ -22,6 +22,20 @@ typedef int (*nvmem_reg_read_t)(void *pr + typedef int (*nvmem_reg_write_t)(void *priv, unsigned int offset, + void *val, size_t bytes); + ++enum nvmem_type { ++ NVMEM_TYPE_UNKNOWN = 0, ++ NVMEM_TYPE_EEPROM, ++ NVMEM_TYPE_OTP, ++ NVMEM_TYPE_BATTERY_BACKED, ++}; ++ ++static const char * const nvmem_type_str[] = { ++ [NVMEM_TYPE_UNKNOWN] = "Unknown", ++ [NVMEM_TYPE_EEPROM] = "EEPROM", ++ [NVMEM_TYPE_OTP] = "OTP", ++ [NVMEM_TYPE_BATTERY_BACKED] = "Battery backed", ++}; ++ + /** + * struct nvmem_config - NVMEM device configuration + * +@@ -31,6 +45,7 @@ typedef int (*nvmem_reg_write_t)(void *p + * @owner: Pointer to exporter module. Used for refcounting. + * @cells: Optional array of pre-defined NVMEM cells. + * @ncells: Number of elements in cells. ++ * @type: Type of the nvmem storage + * @read_only: Device is read-only. + * @root_only: Device is accessibly to root only. + * @reg_read: Callback to read data. +@@ -54,6 +69,7 @@ struct nvmem_config { + struct module *owner; + const struct nvmem_cell_info *cells; + int ncells; ++ enum nvmem_type type; + bool read_only; + bool root_only; + nvmem_reg_read_t reg_read; |