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SubjectRe: [PATCH v8 1/5] nvmem: core: add nvmem_device_find
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On 10/9/19 12:17 PM, Thomas Bogendoerfer wrote:
> nvmem_device_find provides a way to search for nvmem devices with
> the help of a match function simlair to bus_find_device.
>
> Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
> Acked-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
> Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
> ---
> Documentation/driver-api/nvmem.rst | 2 ++
> drivers/nvmem/core.c | 61 +++++++++++++++++---------------------
> include/linux/nvmem-consumer.h | 9 ++++++
> 3 files changed, 38 insertions(+), 34 deletions(-)
>
> diff --git a/Documentation/driver-api/nvmem.rst b/Documentation/driver-api/nvmem.rst
> index d9d958d5c824..287e86819640 100644
> --- a/Documentation/driver-api/nvmem.rst
> +++ b/Documentation/driver-api/nvmem.rst
> @@ -129,6 +129,8 @@ To facilitate such consumers NVMEM framework provides below apis::
> struct nvmem_device *nvmem_device_get(struct device *dev, const char *name);
> struct nvmem_device *devm_nvmem_device_get(struct device *dev,
> const char *name);
> + struct nvmem_device *nvmem_device_find(void *data,
> + int (*match)(struct device *dev, const void *data));
> void nvmem_device_put(struct nvmem_device *nvmem);
> int nvmem_device_read(struct nvmem_device *nvmem, unsigned int offset,
> size_t bytes, void *buf);
> diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
> index 057d1ff87d5d..9f1ee9c766ec 100644
> --- a/drivers/nvmem/core.c
> +++ b/drivers/nvmem/core.c
> @@ -76,33 +76,6 @@ static struct bus_type nvmem_bus_type = {
> .name = "nvmem",
> };
>
> -static struct nvmem_device *of_nvmem_find(struct device_node *nvmem_np)
> -{
> - struct device *d;
> -
> - if (!nvmem_np)
> - return NULL;
> -
> - d = bus_find_device_by_of_node(&nvmem_bus_type, nvmem_np);
> -
> - if (!d)
> - return NULL;
> -
> - return to_nvmem_device(d);
> -}
> -
> -static struct nvmem_device *nvmem_find(const char *name)
> -{
> - struct device *d;
> -
> - d = bus_find_device_by_name(&nvmem_bus_type, NULL, name);
> -
> - if (!d)
> - return NULL;
> -
> - return to_nvmem_device(d);
> -}
> -
> static void nvmem_cell_drop(struct nvmem_cell *cell)
> {
> blocking_notifier_call_chain(&nvmem_notifier, NVMEM_CELL_REMOVE, cell);
> @@ -532,13 +505,16 @@ int devm_nvmem_unregister(struct device *dev, struct nvmem_device *nvmem)
> }
> EXPORT_SYMBOL(devm_nvmem_unregister);
>
> -static struct nvmem_device *__nvmem_device_get(struct device_node *np,
> - const char *nvmem_name)
> +static struct nvmem_device *__nvmem_device_get(void *data,
> + int (*match)(struct device *dev, const void *data))
> {
> struct nvmem_device *nvmem = NULL;
> + struct device *dev;
>
> mutex_lock(&nvmem_mutex);
> - nvmem = np ? of_nvmem_find(np) : nvmem_find(nvmem_name);
> + dev = bus_find_device(&nvmem_bus_type, NULL, data, match);
> + if (dev)
> + nvmem = to_nvmem_device(dev);
> mutex_unlock(&nvmem_mutex);
> if (!nvmem)
> return ERR_PTR(-EPROBE_DEFER);
> @@ -587,7 +563,7 @@ struct nvmem_device *of_nvmem_device_get(struct device_node *np, const char *id)
> if (!nvmem_np)
> return ERR_PTR(-ENOENT);
>
> - return __nvmem_device_get(nvmem_np, NULL);
> + return __nvmem_device_get(nvmem_np, device_match_of_node);
> }
> EXPORT_SYMBOL_GPL(of_nvmem_device_get);
> #endif
> @@ -613,10 +589,26 @@ struct nvmem_device *nvmem_device_get(struct device *dev, const char *dev_name)
>
> }
>
> - return __nvmem_device_get(NULL, dev_name);
> + return __nvmem_device_get((void *)dev_name, device_match_name);
> }
> EXPORT_SYMBOL_GPL(nvmem_device_get);
>
> +/**
> + * nvmem_device_find() - Find nvmem device with matching function
> + *
> + * @data: Data to pass to match function
> + * @match: Callback function to check device
> + *
> + * Return: ERR_PTR() on error or a valid pointer to a struct nvmem_device
> + * on success.
> + */
> +struct nvmem_device *nvmem_device_find(void *data,
> + int (*match)(struct device *dev, const void *data))
> +{
> + return __nvmem_device_get(data, match);
> +}
> +EXPORT_SYMBOL_GPL(nvmem_device_find);
> +
> static int devm_nvmem_device_match(struct device *dev, void *res, void *data)
> {
> struct nvmem_device **nvmem = res;
> @@ -710,7 +702,8 @@ nvmem_cell_get_from_lookup(struct device *dev, const char *con_id)
> if ((strcmp(lookup->dev_id, dev_id) == 0) &&
> (strcmp(lookup->con_id, con_id) == 0)) {
> /* This is the right entry. */
> - nvmem = __nvmem_device_get(NULL, lookup->nvmem_name);
> + nvmem = __nvmem_device_get((void *)lookup->nvmem_name,
> + device_match_name);
> if (IS_ERR(nvmem)) {
> /* Provider may not be registered yet. */
> cell = ERR_CAST(nvmem);
> @@ -780,7 +773,7 @@ struct nvmem_cell *of_nvmem_cell_get(struct device_node *np, const char *id)
> if (!nvmem_np)
> return ERR_PTR(-EINVAL);
>
> - nvmem = __nvmem_device_get(nvmem_np, NULL);
> + nvmem = __nvmem_device_get(nvmem_np, device_match_of_node);
> of_node_put(nvmem_np);
> if (IS_ERR(nvmem))
> return ERR_CAST(nvmem);
> diff --git a/include/linux/nvmem-consumer.h b/include/linux/nvmem-consumer.h
> index 8f8be5b00060..02dc4aa992b2 100644
> --- a/include/linux/nvmem-consumer.h
> +++ b/include/linux/nvmem-consumer.h
> @@ -89,6 +89,9 @@ void nvmem_del_cell_lookups(struct nvmem_cell_lookup *entries,
> int nvmem_register_notifier(struct notifier_block *nb);
> int nvmem_unregister_notifier(struct notifier_block *nb);
>
> +struct nvmem_device *nvmem_device_find(void *data,
> + int (*match)(struct device *dev, const void *data));
> +
> #else
>
> static inline struct nvmem_cell *nvmem_cell_get(struct device *dev,
> @@ -204,6 +207,12 @@ static inline int nvmem_unregister_notifier(struct notifier_block *nb)
> return -EOPNOTSUPP;
> }
>
> +static inline struct nvmem_device *nvmem_device_find(void *data,
> + int (*match)(struct device *dev, const void *data))
> +{
> + return NULL;
> +}
> +
> #endif /* CONFIG_NVMEM */
>
> #if IS_ENABLED(CONFIG_NVMEM) && IS_ENABLED(CONFIG_OF)
>

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

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