From: Richard Fitzgerald <rf@opensource.cirrus.com>
To: <broonie@kernel.org>, <robh+dt@kernel.org>, <nsaenzjulienne@suse.de>
Cc: devicetree@vger.kernel.org, alsa-devel@alsa-project.org,
patches@opensource.cirrus.com, linux-kernel@vger.kernel.org,
Richard Fitzgerald <rf@opensource.cirrus.com>,
linux-rpi-kernel@lists.infradead.org,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/7] of: base: Add of_count_phandle_with_fixed_args()
Date: Wed, 14 Oct 2020 15:54:12 +0100 [thread overview]
Message-ID: <20201014145418.31838-2-rf@opensource.cirrus.com> (raw)
In-Reply-To: <20201014145418.31838-1-rf@opensource.cirrus.com>
Add an equivalent of of_count_phandle_with_args() for fixed argument
sets, to pair with of_parse_phandle_with_fixed_args().
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
---
drivers/of/base.c | 42 ++++++++++++++++++++++++++++++++++++++++++
include/linux/of.h | 9 +++++++++
2 files changed, 51 insertions(+)
diff --git a/drivers/of/base.c b/drivers/of/base.c
index ea44fea99813..45d8b0e65345 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1772,6 +1772,48 @@ int of_count_phandle_with_args(const struct device_node *np, const char *list_na
}
EXPORT_SYMBOL(of_count_phandle_with_args);
+/**
+ * of_count_phandle_with_fixed_args() - Find the number of phandles references in a property
+ * @np: pointer to a device tree node containing a list
+ * @list_name: property name that contains a list
+ * @cell_count: number of argument cells following the phandle
+ *
+ * Returns the number of phandle + argument tuples within a property. It
+ * is a typical pattern to encode a list of phandle and variable
+ * arguments into a single property.
+ */
+int of_count_phandle_with_fixed_args(const struct device_node *np,
+ const char *list_name,
+ int cells_count)
+{
+ struct of_phandle_iterator it;
+ int rc, cur_index = 0;
+
+ if (!cells_count) {
+ const __be32 *list;
+ int size;
+
+ list = of_get_property(np, list_name, &size);
+ if (!list)
+ return -ENOENT;
+
+ return size / sizeof(*list);
+ }
+
+ rc = of_phandle_iterator_init(&it, np, list_name, NULL, cells_count);
+ if (rc)
+ return rc;
+
+ while ((rc = of_phandle_iterator_next(&it)) == 0)
+ cur_index += 1;
+
+ if (rc != -ENOENT)
+ return rc;
+
+ return cur_index;
+}
+EXPORT_SYMBOL(of_count_phandle_with_fixed_args);
+
/**
* __of_add_property - Add a property to a node without lock operations
*/
diff --git a/include/linux/of.h b/include/linux/of.h
index 5cf7ae0465d1..9f315da4e9da 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -377,6 +377,8 @@ extern int of_parse_phandle_with_fixed_args(const struct device_node *np,
struct of_phandle_args *out_args);
extern int of_count_phandle_with_args(const struct device_node *np,
const char *list_name, const char *cells_name);
+extern int of_count_phandle_with_fixed_args(const struct device_node *np,
+ const char *list_name, int cells_count);
/* phandle iterator functions */
extern int of_phandle_iterator_init(struct of_phandle_iterator *it,
@@ -886,6 +888,13 @@ static inline int of_count_phandle_with_args(struct device_node *np,
return -ENOSYS;
}
+static inline int of_count_phandle_with_fixed_args(const struct device_node *np,
+ const char *list_name,
+ int cells_count)
+{
+ return -ENOSYS;
+}
+
static inline int of_phandle_iterator_init(struct of_phandle_iterator *it,
const struct device_node *np,
const char *list_name,
--
2.20.1
next prev parent reply other threads:[~2020-10-14 14:57 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-14 14:54 [PATCH 0/7] Add dts for Rpi4 + Cirrus Lochnagar and codecs Richard Fitzgerald
2020-10-14 14:54 ` Richard Fitzgerald [this message]
2020-10-14 18:39 ` [PATCH 1/7] of: base: Add of_count_phandle_with_fixed_args() Rob Herring
2020-10-15 16:52 ` Robin Murphy
2020-10-16 9:10 ` Richard Fitzgerald
2020-10-16 13:31 ` Rob Herring
2020-10-16 15:14 ` Richard Fitzgerald
2020-10-14 14:54 ` [PATCH 2/7] ASoC: simple-card: Add plls and sysclks DT schema Richard Fitzgerald
2020-10-14 14:54 ` [PATCH 3/7] ASoC: simple-card: Support setting component plls and sysclks Richard Fitzgerald
2020-10-14 14:54 ` [PATCH 4/7] ASoC: arizona: Allow codecs to be selected from kernel config Richard Fitzgerald
2020-10-15 0:19 ` kernel test robot
2020-10-14 14:54 ` [PATCH 5/7] ASoC: madera: " Richard Fitzgerald
2020-10-14 14:54 ` [PATCH 6/7] ARM: dts: Add dts for Raspberry Pi 4 + Cirrus Logic Lochnagar2 Richard Fitzgerald
2020-10-15 10:25 ` Nicolas Saenz Julienne
2020-10-15 11:14 ` Richard Fitzgerald
2020-10-15 15:12 ` Nicolas Saenz Julienne
2020-10-15 17:32 ` Mark Brown
2020-10-16 9:01 ` Richard Fitzgerald
2020-10-14 14:54 ` [PATCH 7/7] MAINTAINERS: Add dts for Cirrus Logic Lochnagar on RPi4 Richard Fitzgerald
2020-10-14 18:56 ` [PATCH 0/7] Add dts for Rpi4 + Cirrus Lochnagar and codecs Mark Brown
2020-10-16 13:30 ` Richard Fitzgerald
2020-10-16 15:18 ` Mark Brown
2020-10-19 20:48 ` Rob Herring
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