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Commit 6446221c authored by Daniel Mack's avatar Daniel Mack Committed by Mark Brown
Browse files

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: default avatarDaniel Mack <zonque@gmail.com>
Acked-by: default avatarHaojian Zhuang <haojian.zhuang@gmail.com>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent 1c459de1

arch/arm/plat-pxa/ssp.c

+25 −0
Original line number Diff line number Diff line
@@ -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);

include/linux/pxa2xx_ssp.h

+11 −0
Original line number Diff line number Diff line
@@ -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