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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>
This commit is contained in:
Daniel Mack 2013-08-12 10:37:18 +02:00 committed by Mark Brown
parent 1c459de1e6
commit 6446221c14
2 changed files with 36 additions and 0 deletions
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25
arch/arm/plat-pxa/ssp.c
View File

@ -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);

11
include/linux/pxa2xx_ssp.h
View File

@ -21,6 +21,8 @@
#include <linux/list.h>
#include <linux/io.h>
#include <linux/of.h>
/*
* SSP Serial Port Registers
@ -190,6 +192,8 @@ struct ssp_device {
int irq;
int drcmr_rx;
int drcmr_tx;
struct device_node *of_node;
};
/**
@ -218,11 +222,18 @@ static inline u32 pxa_ssp_read_reg(struct ssp_device *dev, u32 reg)
#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;
}
static inline void pxa_ssp_free(struct ssp_device *ssp) {}
#endif