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Message-ID: <1324402840-32451-3-git-send-email-b29396@freescale.com>
Date: Wed, 21 Dec 2011 01:40:37 +0800
From: Dong Aisheng <b29396@...escale.com>
To: <linux-kernel@...r.kernel.org>
CC: <linux-arm-kernel@...ts.infradead.org>,
<linus.walleij@...ricsson.com>, <s.hauer@...gutronix.de>,
<shawn.guo@...escale.com>, <kernel@...gutronix.de>,
<grant.likely@...retlab.ca>, <rob.herring@...xeda.com>,
<devicetree-discuss@...ts.ozlabs.org>, <cjb@...top.org>,
<w.sang@...gutronix.de>
Subject: [RFC PATCH v3 2/5] pinctrl: add dt binding support for pinmux mappings
From: Dong Aisheng <dong.aisheng@...aro.org>
This patch provies a common API for driver to use to register pinmux
mappings from dts file. It is needed for dt support.
Signed-off-by: Dong Aisheng <dong.aisheng@...aro.org>
Cc: Linus Walleij <linus.walleij@...aro.org>
Cc: Grant Likely <grant.likely@...retlab.ca>
Cc: Rob Herring <rob.herring@...xeda.com>
---
.../devicetree/bindings/pinctrl/pinctrl.txt | 33 +++++++
drivers/pinctrl/pinmux.c | 101 ++++++++++++++++++++
include/linux/pinctrl/machine.h | 6 +
3 files changed, 140 insertions(+), 0 deletions(-)
create mode 100644 Documentation/devicetree/bindings/pinctrl/pinctrl.txt
diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl.txt
new file mode 100644
index 0000000..a27a7ce
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/pinctrl.txt
@@ -0,0 +1,33 @@
+The pin control subsystem
+
+The pin control subsystem provides a common API to support parsing pinmux
+mappings data from device tree. Each board dts file should provide a device
+node of which all the child nodes are the corresponding pinmux mappings.
+
+The required properties for pinmux mapping are:
+- map-name: the name of this specific map entry
+- clk-dev-name: the name of the device controlling this specific mapping
+- funcion: a function in the driver to use for this mapping
+
+Optional properties:
+- group: a certain specific pin group to activate for the function
+- dev-name: the name of the device using this specific mapping
+- hog-on-boot: indicate wether hog the mappings(do not need to specify value)
+
+Examples:
+
+pinmux: imx6q-sabreauto-map {
+ map-sd4 {
+ map-name = "usdhc4";
+ ctrl-dev-name = "20e0000.iomuxc";
+ function = "sd4";
+ dev-name = "219c000.usdhc";
+ };
+ ...
+};
+
+Then calling pinmux_of_register_mappings() with the device node of
+imx6q-sabreauto-map as parameter to register pinmux mappings from dts.
+
+Usually user can get this device node via a phandle in driver then call
+the function to register maps. Please refer to pinctrl-imx.txt for example.
diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c
index 432feb6..3ac3098 100644
--- a/drivers/pinctrl/pinmux.c
+++ b/drivers/pinctrl/pinmux.c
@@ -20,6 +20,7 @@
#include <linux/err.h>
#include <linux/list.h>
#include <linux/mutex.h>
+#include <linux/of_device.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/sysfs.h>
@@ -410,6 +411,106 @@ int __init pinmux_register_mappings(struct pinmux_map const *maps,
return 0;
}
+static int __devinit pinmux_of_parse_mapping(struct device_node *np,
+ struct pinmux_map *maps, unsigned id)
+{
+ struct pinmux_map *map = &maps[id];
+ int ret = 0;
+
+ pr_debug("parse pinmux map %d\n", id + 1);
+
+ if (of_find_property(np, "map-name", NULL)) {
+ ret = of_property_read_string(np, "map-name", &map->name);
+ if (ret) {
+ pr_err("failed to get map-name");
+ return ret;
+ }
+ }
+
+ if (of_find_property(np, "ctrl-dev-name", NULL)) {
+ ret = of_property_read_string(np, "ctrl-dev-name",
+ &map->ctrl_dev_name);
+ if (ret) {
+ pr_err("failed to get ctrl-dev-name");
+ return ret;
+ }
+ }
+
+ if (of_find_property(np, "function", NULL)) {
+ ret = of_property_read_string(np, "function", &map->function);
+ if (ret) {
+ pr_err("failed to get function");
+ return ret;
+ }
+ }
+
+ if (of_find_property(np, "group", NULL)) {
+ ret = of_property_read_string(np, "group", &map->group);
+ if (ret) {
+ pr_err("failed to get group");
+ return ret;
+ }
+ }
+
+ if (of_find_property(np, "dev-name", NULL)) {
+ ret = of_property_read_string(np, "dev-name", &map->dev_name);
+ if (ret) {
+ pr_err("failed to get dev-name");
+ return ret;
+ }
+ }
+
+ if (of_find_property(np, "hog-on-boot", NULL))
+ map->hog_on_boot = true;
+
+ pr_debug("map-name: %s ctrl-dev-name: %s function: %s group: %s dev-name: %s hog-on-boot: %d\n",
+ map->name, map->ctrl_dev_name, map->function,
+ map->group, map->dev_name, map->hog_on_boot);
+
+ return 0;
+}
+
+/**
+ * pinmux_of_register_mappings() - parse and register pinmux mappings from dt
+ * &np: a device node containing pinmux map properties
+ *
+ * Like pinmux_register_mappings(), the memory of pinmux maps are owned by
+ * pinctrl core and can not be freed.
+ */
+int __devinit pinmux_of_register_mappings(struct device_node *np)
+{
+ struct pinmux_map *maps;
+ struct device_node *child = NULL;
+ int count, i;
+ int ret;
+
+ pr_debug("parse pinmux maps from device node %s\n", np->name);
+
+ if (!np)
+ return -EINVAL;
+
+ count = of_get_child_count(np);
+ if (!count) {
+ pr_err("no available pinmux maps found\n");
+ return -EINVAL;
+ }
+
+ maps = kzalloc(count * sizeof(struct pinmux_map), GFP_KERNEL);
+ if (!maps)
+ return -ENOMEM;
+
+ i = 0;
+ for_each_child_of_node(np, child) {
+ ret = pinmux_of_parse_mapping(child, maps, i++);
+ if (ret) {
+ pr_err("failed to parse pinmux map\n");
+ return ret;
+ }
+ }
+
+ return pinmux_register_mappings(maps, count);
+}
+
/**
* acquire_pins() - acquire all the pins for a certain funcion on a pinmux
* @pctldev: the device to take the pins on
diff --git a/include/linux/pinctrl/machine.h b/include/linux/pinctrl/machine.h
index ad430e0..74a695d 100644
--- a/include/linux/pinctrl/machine.h
+++ b/include/linux/pinctrl/machine.h
@@ -78,6 +78,7 @@ struct pinmux_map {
extern int pinmux_register_mappings(struct pinmux_map const *map,
unsigned num_maps);
+extern int pinmux_of_register_mappings(struct device_node *np);
#else
static inline int pinmux_register_mappings(struct pinmux_map const *map,
@@ -86,5 +87,10 @@ static inline int pinmux_register_mappings(struct pinmux_map const *map,
return 0;
}
+static inline int pinmux_of_register_mappings(struct device_node *np)
+{
+ return 0;
+}
+
#endif /* !CONFIG_PINMUX */
#endif
--
1.7.0.4
--
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