From: Thomas Bogendoerfer <tbogendoerfer@suse.de>
To: Jonathan Corbet <corbet@lwn.net>,
Ralf Baechle <ralf@linux-mips.org>,
Paul Burton <paul.burton@mips.com>,
James Hogan <jhogan@kernel.org>, Lee Jones <lee.jones@linaro.org>,
"David S. Miller" <davem@davemloft.net>,
Srinivas Kandagatla <srinivas.kandagatla@linaro.org>,
Alessandro Zummo <a.zummo@towertech.it>,
Alexandre Belloni <alexandre.belloni@bootlin.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jslaby@suse.com>,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mips@vger.kernel.org, netdev@vger.kernel.org,
linux-rtc@vger.kernel.org, linux-serial@vger.kernel.org
Subject: [PATCH v7 1/5] nvmem: core: add nvmem_device_find
Date: Thu, 3 Oct 2019 11:52:29 +0200 [thread overview]
Message-ID: <20191003095235.5158-2-tbogendoerfer@suse.de> (raw)
In-Reply-To: <20191003095235.5158-1-tbogendoerfer@suse.de>
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)
--
2.16.4
next prev parent reply other threads:[~2019-10-03 9:53 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-03 9:52 [PATCH v7 0/5] Use MFD framework for SGI IOC3 drivers Thomas Bogendoerfer
2019-10-03 9:52 ` Thomas Bogendoerfer [this message]
2019-10-07 17:54 ` [PATCH v7 1/5] nvmem: core: add nvmem_device_find Paul Burton
2019-10-03 9:52 ` [PATCH v7 2/5] MIPS: PCI: use information from 1-wire PROM for IOC3 detection Thomas Bogendoerfer
2019-10-07 17:54 ` Paul Burton
2019-10-03 9:52 ` [PATCH v7 3/5] mfd: ioc3: Add driver for SGI IOC3 chip Thomas Bogendoerfer
2019-10-04 14:44 ` Lee Jones
2019-10-04 17:25 ` Thomas Bogendoerfer
2019-10-03 9:52 ` [PATCH v7 4/5] MIPS: SGI-IP27: fix readb/writeb addressing Thomas Bogendoerfer
2019-10-03 9:52 ` [PATCH v7 5/5] MIPS: SGI-IP27: Enable ethernet phy on second Origin 200 module Thomas Bogendoerfer
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20191003095235.5158-2-tbogendoerfer@suse.de \
--to=tbogendoerfer@suse.de \
--cc=a.zummo@towertech.it \
--cc=alexandre.belloni@bootlin.com \
--cc=corbet@lwn.net \
--cc=davem@davemloft.net \
--cc=gregkh@linuxfoundation.org \
--cc=jhogan@kernel.org \
--cc=jslaby@suse.com \
--cc=lee.jones@linaro.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mips@vger.kernel.org \
--cc=linux-rtc@vger.kernel.org \
--cc=linux-serial@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=paul.burton@mips.com \
--cc=ralf@linux-mips.org \
--cc=srinivas.kandagatla@linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).