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>

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>
Daniel Mack · Mark Brown
1 parent 1c459de1e6
Showing 2 changed files with 36 additions and 0 deletions Side-by-side Diff
arch/arm/plat-pxa/ssp.c
include/linux/pxa2xx_ssp.h
@@ -62,6 +62,30 @@
 }
 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 @@
 	}
  
 	ssp->use_count = 0;
+	ssp->of_node = dev->of_node;
  
 	mutex_lock(&ssp_lock);
 	list_add(&ssp->node, &ssp_list);
@@ -21,7 +21,9 @@
  
 #include <linux/list.h>
 #include <linux/io.h>
+#include <linux/of.h>
  
+
 /*
  * SSP Serial Port Registers
  * PXA250, PXA255, PXA26x and PXA27x SSP controllers are all slightly different.
@@ -190,6 +192,8 @@
 	int		irq;
 	int		drcmr_rx;
 	int		drcmr_tx;
+
+	struct device_node	*of_node;
 };
  
 /**
  
@@ -218,8 +222,15 @@
 #ifdef CONFIG_ARCH_PXA
 struct ssp_device *pxa_ssp_request(int port, const char *label);
 void pxa_ssp_free(struct ssp_device *);
+struct ssp_device *pxa_ssp_request_of(const struct device_node *of_node,
+				      const char *label);
 #else
 static inline struct ssp_device *pxa_ssp_request(int port, const char *label)
+{
+	return NULL;
+}
+static inline struct ssp_device *pxa_ssp_request_of(const struct device_node *n,
+						    const char *name)
 {
 	return NULL;
 }
...	...	@@ -62,6 +62,30 @@
62	62	}
63	63	EXPORT_SYMBOL(pxa_ssp_request);
64	64
	65	+struct ssp_device pxa_ssp_request_of(const struct device_node of_node,
	66	+ const char *label)
	67	+{
	68	+ struct ssp_device *ssp = NULL;
	69	+
	70	+ mutex_lock(&ssp_lock);
	71	+
	72	+ list_for_each_entry(ssp, &ssp_list, node) {
	73	+ if (ssp->of_node == of_node && ssp->use_count == 0) {
	74	+ ssp->use_count++;
	75	+ ssp->label = label;
	76	+ break;
	77	+ }
	78	+ }
	79	+
	80	+ mutex_unlock(&ssp_lock);
	81	+
	82	+ if (&ssp->node == &ssp_list)
	83	+ return NULL;
	84	+
	85	+ return ssp;
	86	+}
	87	+EXPORT_SYMBOL(pxa_ssp_request_of);
	88	+
65	89	void pxa_ssp_free(struct ssp_device *ssp)
66	90	{
67	91	mutex_lock(&ssp_lock);
...	...	@@ -185,6 +209,7 @@
185	209	}
186	210
187	211	ssp->use_count = 0;
	212	+ ssp->of_node = dev->of_node;
188	213
189	214	mutex_lock(&ssp_lock);
190	215	list_add(&ssp->node, &ssp_list);
...	...	@@ -21,7 +21,9 @@
21	21
22	22	#include <linux/list.h>
23	23	#include <linux/io.h>
	24	+#include <linux/of.h>
24	25
	26	+
25	27	/*
26	28	* SSP Serial Port Registers
27	29	* PXA250, PXA255, PXA26x and PXA27x SSP controllers are all slightly different.
...	...	@@ -190,6 +192,8 @@
190	192	int irq;
191	193	int drcmr_rx;
192	194	int drcmr_tx;
	195	+
	196	+ struct device_node *of_node;
193	197	};
194	198
195	199	/**
196	200
...	...	@@ -218,8 +222,15 @@
218	222	#ifdef CONFIG_ARCH_PXA
219	223	struct ssp_device pxa_ssp_request(int port, const char label);
220	224	void pxa_ssp_free(struct ssp_device *);
	225	+struct ssp_device pxa_ssp_request_of(const struct device_node of_node,
	226	+ const char *label);
221	227	#else
222	228	static inline struct ssp_device pxa_ssp_request(int port, const char label)
	229	+{
	230	+ return NULL;
	231	+}
	232	+static inline struct ssp_device pxa_ssp_request_of(const struct device_node n,
	233	+ const char *name)
223	234	{
224	235	return NULL;
225	236	}