From 6446221c14ef3bf58754cf1948631128dbe62700 Mon Sep 17 00:00:00 2001 From: Daniel Mack Date: Mon, 12 Aug 2013 10:37:18 +0200 Subject: 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 Acked-by: Haojian Zhuang Signed-off-by: Mark Brown --- arch/arm/plat-pxa/ssp.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'arch/arm/plat-pxa/ssp.c') diff --git a/arch/arm/plat-pxa/ssp.c b/arch/arm/plat-pxa/ssp.c index f2661355fa4e..c83f27b6bdda 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); -- cgit v1.2.3