diff options
| author | Eric Anholt <eric@anholt.net> | 2018-12-12 15:51:48 -0800 |
|---|---|---|
| committer | Stefan Wahren <stefan.wahren@i2se.com> | 2019-01-09 16:55:09 +0100 |
| commit | 670c672608a1ffcbc7ac0f872734843593bb8b15 (patch) | |
| tree | ed0a90dbdc31abac4f32f7893e2a532fad810a1e /drivers/mfd | |
| parent | 5e6acc3e678ed3db746ab4fb53a980861cd711b6 (diff) | |
soc: bcm: bcm2835-pm: Add support for power domains under a new binding.
This provides a free software alternative to raspberrypi-power.c's
firmware calls to manage power domains. It also exposes a reset line,
where previously the vc4 driver had to try to force power off the
domain in order to trigger a reset.
Signed-off-by: Eric Anholt <eric@anholt.net>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Diffstat (limited to 'drivers/mfd')
| -rw-r--r-- | drivers/mfd/bcm2835-pm.c | 36 |
1 files changed, 32 insertions, 4 deletions
diff --git a/drivers/mfd/bcm2835-pm.c b/drivers/mfd/bcm2835-pm.c index 53839e6a81e7..42fe67f1538e 100644 --- a/drivers/mfd/bcm2835-pm.c +++ b/drivers/mfd/bcm2835-pm.c @@ -3,7 +3,7 @@ * PM MFD driver for Broadcom BCM2835 * * This driver binds to the PM block and creates the MFD device for - * the WDT driver. + * the WDT and power drivers. */ #include <linux/delay.h> @@ -21,11 +21,16 @@ static const struct mfd_cell bcm2835_pm_devs[] = { { .name = "bcm2835-wdt" }, }; +static const struct mfd_cell bcm2835_power_devs[] = { + { .name = "bcm2835-power" }, +}; + static int bcm2835_pm_probe(struct platform_device *pdev) { struct resource *res; struct device *dev = &pdev->dev; struct bcm2835_pm *pm; + int ret; pm = devm_kzalloc(dev, sizeof(*pm), GFP_KERNEL); if (!pm) @@ -39,13 +44,36 @@ static int bcm2835_pm_probe(struct platform_device *pdev) if (IS_ERR(pm->base)) return PTR_ERR(pm->base); - return devm_mfd_add_devices(dev, -1, - bcm2835_pm_devs, ARRAY_SIZE(bcm2835_pm_devs), - NULL, 0, NULL); + ret = devm_mfd_add_devices(dev, -1, + bcm2835_pm_devs, ARRAY_SIZE(bcm2835_pm_devs), + NULL, 0, NULL); + if (ret) + return ret; + + /* We'll use the presence of the AXI ASB regs in the + * bcm2835-pm binding as the key for whether we can reference + * the full PM register range and support power domains. + */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (res) { + pm->asb = devm_ioremap_resource(dev, res); + if (IS_ERR(pm->asb)) + return PTR_ERR(pm->asb); + + ret = devm_mfd_add_devices(dev, -1, + bcm2835_power_devs, + ARRAY_SIZE(bcm2835_power_devs), + NULL, 0, NULL); + if (ret) + return ret; + } + + return 0; } static const struct of_device_id bcm2835_pm_of_match[] = { { .compatible = "brcm,bcm2835-pm-wdt", }, + { .compatible = "brcm,bcm2835-pm", }, {}, }; MODULE_DEVICE_TABLE(of, bcm2835_pm_of_match); |