From 69d5af8d016c803420258a476789ec6e7e7844dc Mon Sep 17 00:00:00 2001 From: Lee Jones Date: Mon, 15 Dec 2014 11:59:09 +0000 Subject: 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 Signed-off-by: Brian Norris --- drivers/mtd/devices/st_spi_fsm.c | 40 ++++++++++++++++++++++++++++++++++++++-- 1 file changed, 38 insertions(+), 2 deletions(-) (limited to 'drivers/mtd') diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c index bebc8b5637c0..3451864b9f68 100644 --- a/drivers/mtd/devices/st_spi_fsm.c +++ b/drivers/mtd/devices/st_spi_fsm.c @@ -24,6 +24,7 @@ #include #include #include +#include #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); -- cgit v1.2.3-58-ga151