diff options
Diffstat (limited to 'drivers/spi/spi-pl022.c')
| -rw-r--r-- | drivers/spi/spi-pl022.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c index 827ad5152d8..b6cfb7b3a59 100644 --- a/drivers/spi/spi-pl022.c +++ b/drivers/spi/spi-pl022.c @@ -42,6 +42,7 @@ #include <linux/pm_runtime.h> #include <linux/gpio.h> #include <linux/of_gpio.h> +#include <linux/pinctrl/consumer.h> /* * This macro is used to define some register default values. @@ -367,6 +368,10 @@ struct pl022 { resource_size_t phybase; void __iomem *virtbase; struct clk *clk; + /* Two optional pin states - default & sleep */ + struct pinctrl *pinctrl; + struct pinctrl_state *pins_default; + struct pinctrl_state *pins_sleep; struct spi_master *master; struct pl022_ssp_controller *master_info; /* Message per-transfer pump */ @@ -2068,6 +2073,28 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id) pl022->chipselects = devm_kzalloc(dev, num_cs * sizeof(int), GFP_KERNEL); + pl022->pinctrl = devm_pinctrl_get(dev); + if (IS_ERR(pl022->pinctrl)) { + status = PTR_ERR(pl022->pinctrl); + goto err_no_pinctrl; + } + + pl022->pins_default = pinctrl_lookup_state(pl022->pinctrl, + PINCTRL_STATE_DEFAULT); + /* enable pins to be muxed in and configured */ + if (!IS_ERR(pl022->pins_default)) { + status = pinctrl_select_state(pl022->pinctrl, + pl022->pins_default); + if (status) + dev_err(dev, "could not set default pins\n"); + } else + dev_err(dev, "could not get default pinstate\n"); + + pl022->pins_sleep = pinctrl_lookup_state(pl022->pinctrl, + PINCTRL_STATE_SLEEP); + if (IS_ERR(pl022->pins_sleep)) + dev_dbg(dev, "could not get sleep pinstate\n"); + /* * Bus Number Which has been Assigned to this SSP controller * on this board @@ -2218,6 +2245,7 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id) amba_release_regions(adev); err_no_ioregion: err_no_gpio: + err_no_pinctrl: spi_master_put(master); err_no_master: err_no_pdata: @@ -2291,15 +2319,33 @@ static int pl022_resume(struct device *dev) static int pl022_runtime_suspend(struct device *dev) { struct pl022 *pl022 = dev_get_drvdata(dev); + int status = 0; clk_disable(pl022->clk); + /* Optionally let pins go into sleep states */ + if (!IS_ERR(pl022->pins_sleep)) { + status = pinctrl_select_state(pl022->pinctrl, + pl022->pins_sleep); + if (status) + dev_err(dev, "could not set pins to sleep state\n"); + } + return 0; } static int pl022_runtime_resume(struct device *dev) { struct pl022 *pl022 = dev_get_drvdata(dev); + int status = 0; + + /* Optionaly enable pins to be muxed in and configured */ + if (!IS_ERR(pl022->pins_default)) { + status = pinctrl_select_state(pl022->pinctrl, + pl022->pins_default); + if (status) + dev_err(dev, "could not set default pins\n"); + } clk_enable(pl022->clk); |