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SubjectRe: [PATCH] nvmem: core: add support to NVMEM_NO_SYSFS_ENTRY
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Please ignore this patch, some problem in my git send mail.
Apologies for the spam.


On 8/4/2020 7:44 PM, Gaurav Kohli wrote:
> From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
>
> Some users might not want to expose nvmem entry to sysfs and
> only intend to use kernel interface so add such provision.
>
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
> ---
> Documentation/ABI/stable/sysfs-bus-nvmem | 2 ++
> drivers/nvmem/Kconfig | 5 +++++
> drivers/nvmem/core.c | 11 ++++++-----
> 3 files changed, 13 insertions(+), 5 deletions(-)
>
> diff --git a/Documentation/ABI/stable/sysfs-bus-nvmem
> b/Documentation/ABI/stable/sysfs-bus-nvmem
> index 5923ab4620c5..12aab0a85fea 100644
> --- a/Documentation/ABI/stable/sysfs-bus-nvmem
> +++ b/Documentation/ABI/stable/sysfs-bus-nvmem
> @@ -6,6 +6,8 @@ Description:
> This file allows user to read/write the raw NVMEM contents.
> Permissions for write to this file depends on the nvmem
> provider configuration.
> + Note: This file is not present if CONFIG_NVMEM_NO_SYSFS_ENTRY
> + is enabled
>
> ex:
> hexdump /sys/bus/nvmem/devices/qfprom0/nvmem
> diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
> index 0a7a470ee859..6ab3276d287c 100644
> --- a/drivers/nvmem/Kconfig
> +++ b/drivers/nvmem/Kconfig
> @@ -192,4 +192,9 @@ config SC27XX_EFUSE
> This driver can also be built as a module. If so, the module
> will be called nvmem-sc27xx-efuse.
>
> +config NVMEM_NO_SYSFS_ENTRY
> + bool "No nvmem sysfs entry"
> +
> + help
> + Say Yes if you do not want to add nvmem entry to sysfs.
> endif
> diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
> index b9a0270883a0..c70f183fe379 100644
> --- a/drivers/nvmem/core.c
> +++ b/drivers/nvmem/core.c
> @@ -216,7 +216,7 @@ static const struct attribute_group
> nvmem_bin_rw_group = {
> .attrs = nvmem_attrs,
> };
>
> -static const struct attribute_group *nvmem_rw_dev_groups[] = {
> +static const __maybe_unused struct attribute_group
> *nvmem_rw_dev_groups[] = {
> &nvmem_bin_rw_group,
> NULL,
> };
> @@ -240,7 +240,7 @@ static const struct attribute_group
> nvmem_bin_ro_group = {
> .attrs = nvmem_attrs,
> };
>
> -static const struct attribute_group *nvmem_ro_dev_groups[] = {
> +static const __maybe_unused struct attribute_group
> *nvmem_ro_dev_groups[] = {
> &nvmem_bin_ro_group,
> NULL,
> };
> @@ -265,7 +265,7 @@ static const struct attribute_group
> nvmem_bin_rw_root_group = {
> .attrs = nvmem_attrs,
> };
>
> -static const struct attribute_group *nvmem_rw_root_dev_groups[] = {
> +static const __maybe_unused struct attribute_group
> *nvmem_rw_root_dev_groups[] = {
> &nvmem_bin_rw_root_group,
> NULL,
> };
> @@ -289,7 +289,7 @@ static const struct attribute_group
> nvmem_bin_ro_root_group = {
> .attrs = nvmem_attrs,
> };
>
> -static const struct attribute_group *nvmem_ro_root_dev_groups[] = {
> +static const __maybe_unused struct attribute_group
> *nvmem_ro_root_dev_groups[] = {
> &nvmem_bin_ro_root_group,
> NULL,
> };
> @@ -688,6 +688,7 @@ struct nvmem_device *nvmem_register(const struct
> nvmem_config *config)
> nvmem->read_only = device_property_present(config->dev, "read-only") |
> config->read_only;
>
> +#if !defined(CONFIG_NVMEM_NO_SYSFS_ENTRY)
> if (config->root_only)
> nvmem->dev.groups = nvmem->read_only ?
> nvmem_ro_root_dev_groups :
> @@ -696,7 +697,7 @@ struct nvmem_device *nvmem_register(const struct
> nvmem_config *config)
> nvmem->dev.groups = nvmem->read_only ?
> nvmem_ro_dev_groups :
> nvmem_rw_dev_groups;
> -
> +#endif
> device_initialize(&nvmem->dev);
>
> dev_dbg(&nvmem->dev, "Registering nvmem device %s\n", config->name);
>

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Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

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