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mtd: st_spi_fsm: Obtain and use EMI clock 

ST's Common Clk Framework is now available. This patch ensures the FSM
makes use of it by obtaining and enabling the EMI clock. If system fails
to provide the EMI clock, we bomb out.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Lee Jones 2014-12-15 11:59:09 +00:00 committed by Brian Norris
parent 5ecd3ea188
commit 69d5af8d01
1 changed files with 38 additions and 2 deletions
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40
drivers/mtd/devices/st_spi_fsm.c
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@ -24,6 +24,7 @@
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/clk.h>
#include "serial_flash_cmds.h"
@ -262,6 +263,7 @@ struct stfsm {
struct mtd_info mtd;
struct mutex lock;
struct flash_info *info;
struct clk *clk;
uint32_t configuration;
uint32_t fifo_dir_delay;
@ -1906,8 +1908,7 @@ static void stfsm_set_freq(struct stfsm *fsm, uint32_t spi_freq)
uint32_t emi_freq;
uint32_t clk_div;
/* TODO: Make this dynamic */
emi_freq = STFSM_DEFAULT_EMI_FREQ;
emi_freq = clk_get_rate(fsm->clk);
/*
* Calculate clk_div - values between 2 and 128
@ -2057,6 +2058,18 @@ static int stfsm_probe(struct platform_device *pdev)
return PTR_ERR(fsm->base);
}
fsm->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(fsm->clk)) {
dev_err(fsm->dev, "Couldn't find EMI clock.\n");
return PTR_ERR(fsm->clk);
}
ret = clk_prepare_enable(fsm->clk);
if (ret) {
dev_err(fsm->dev, "Failed to enable EMI clock.\n");
return ret;
}
mutex_init(&fsm->lock);
ret = stfsm_init(fsm);
@ -2121,6 +2134,28 @@ static int stfsm_remove(struct platform_device *pdev)
return mtd_device_unregister(&fsm->mtd);
}
#ifdef CONFIG_PM_SLEEP
static int stfsmfsm_suspend(struct device *dev)
{
struct stfsm *fsm = dev_get_drvdata(dev);
clk_disable_unprepare(fsm->clk);
return 0;
}
static int stfsmfsm_resume(struct device *dev)
{
struct stfsm *fsm = dev_get_drvdata(dev);
clk_prepare_enable(fsm->clk);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(stfsm_pm_ops, stfsmfsm_suspend, stfsmfsm_resume);
static const struct of_device_id stfsm_match[] = {
{ .compatible = "st,spi-fsm", },
{},
@ -2133,6 +2168,7 @@ static struct platform_driver stfsm_driver = {
.driver = {
.name = "st-spi-fsm",
.of_match_table = stfsm_match,
.pm = &stfsm_pm_ops,
},
};
module_platform_driver(stfsm_driver);