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authorDaniel Mack <zonque@gmail.com>2013-08-12 10:37:18 +0200
committerMark Brown <broonie@linaro.org>2013-08-14 19:54:30 +0100
commit6446221c14ef3bf58754cf1948631128dbe62700 (patch)
tree85b98c217d9528e1a1771f8599875c4814a3b1db /arch/arm/plat-pxa
parent1c459de1e645b213a07b9492884a54f5861409f5 (diff)
downloadop-kernel-dev-6446221c14ef3bf58754cf1948631128dbe62700.zip
op-kernel-dev-6446221c14ef3bf58754cf1948631128dbe62700.tar.gz
ARM: pxa: ssp: add pxa_ssp_request_of()
Add a function to lookup ssp devices from device tree. This way, users can reference the ssp devices in order to register to them. Signed-off-by: Daniel Mack <zonque@gmail.com> Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com> Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'arch/arm/plat-pxa')
-rw-r--r--arch/arm/plat-pxa/ssp.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/arm/plat-pxa/ssp.c b/arch/arm/plat-pxa/ssp.c
index f266135..c83f27b 100644
--- a/arch/arm/plat-pxa/ssp.c
+++ b/arch/arm/plat-pxa/ssp.c
@@ -62,6 +62,30 @@ struct ssp_device *pxa_ssp_request(int port, const char *label)
}
EXPORT_SYMBOL(pxa_ssp_request);
+struct ssp_device *pxa_ssp_request_of(const struct device_node *of_node,
+ const char *label)
+{
+ struct ssp_device *ssp = NULL;
+
+ mutex_lock(&ssp_lock);
+
+ list_for_each_entry(ssp, &ssp_list, node) {
+ if (ssp->of_node == of_node && ssp->use_count == 0) {
+ ssp->use_count++;
+ ssp->label = label;
+ break;
+ }
+ }
+
+ mutex_unlock(&ssp_lock);
+
+ if (&ssp->node == &ssp_list)
+ return NULL;
+
+ return ssp;
+}
+EXPORT_SYMBOL(pxa_ssp_request_of);
+
void pxa_ssp_free(struct ssp_device *ssp)
{
mutex_lock(&ssp_lock);
@@ -185,6 +209,7 @@ static int pxa_ssp_probe(struct platform_device *pdev)
}
ssp->use_count = 0;
+ ssp->of_node = dev->of_node;
mutex_lock(&ssp_lock);
list_add(&ssp->node, &ssp_list);
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