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OpenCloudOS-Kernel/drivers/pmdomain/bcm/raspberrypi-power.c

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soc: bcm: Switch raspberrypi-power to SPDX identifier Adopt the SPDX license identifier headers to ease license compliance management. Cc: Alexander Aring <aring@mojatatu.com> Cc: Eric Anholt <eric@anholt.net> Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com> Reviewed-by: Eric Anholt <eric@anholt.net>
2018-10-23 04:35:02 +08:00
// SPDX-License-Identifier: GPL-2.0
ARM: bcm2835: add rpi power domain driver This patch adds support for several power domains on Raspberry Pi, including USB (so it can be enabled even if the bootloader didn't do it), and graphics. This patch is the combined work of Eric Anholt (who wrote USB support inside of the Raspberry Pi firmware driver, and wrote the non-USB domain support) and Alexander Aring (who separated the original USB work out from the firmware driver). Signed-off-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: Eric Anholt <eric@anholt.net> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Kevin Hilman <khilman@linaro.org>
2015-12-17 08:26:47 +08:00
/* (C) 2015 Pengutronix, Alexander Aring <aar@pengutronix.de>
*
* Authors:
* Alexander Aring <aar@pengutronix.de>
* Eric Anholt <eric@anholt.net>
*/
#include <linux/module.h>
soc: bcm: Explicitly include correct DT includes The DT of_device.h and of_platform.h date back to the separate of_platform_bus_type before it was merged into the regular platform bus. As part of that merge prepping Arm DT support 13 years ago, they "temporarily" include each other. They also include platform_device.h and of.h. As a result, there's a pretty much random mix of those include files used throughout the tree. In order to detangle these headers and replace the implicit includes with struct declarations, users need to explicitly include the correct includes. Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20230726233130.3811017-1-robh@kernel.org Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
2023-07-27 07:31:29 +08:00
#include <linux/of.h>
ARM: bcm2835: add rpi power domain driver This patch adds support for several power domains on Raspberry Pi, including USB (so it can be enabled even if the bootloader didn't do it), and graphics. This patch is the combined work of Eric Anholt (who wrote USB support inside of the Raspberry Pi firmware driver, and wrote the non-USB domain support) and Alexander Aring (who separated the original USB work out from the firmware driver). Signed-off-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: Eric Anholt <eric@anholt.net> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Kevin Hilman <khilman@linaro.org>
2015-12-17 08:26:47 +08:00
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <dt-bindings/power/raspberrypi-power.h>
#include <soc/bcm2835/raspberrypi-firmware.h>
/*
* Firmware indices for the old power domains interface. Only a few
* of them were actually implemented.
*/
#define RPI_OLD_POWER_DOMAIN_USB 3
#define RPI_OLD_POWER_DOMAIN_V3D 10
struct rpi_power_domain {
u32 domain;
bool enabled;
bool old_interface;
struct generic_pm_domain base;
struct rpi_firmware *fw;
};
struct rpi_power_domains {
bool has_new_interface;
struct genpd_onecell_data xlate;
struct rpi_firmware *fw;
struct rpi_power_domain domains[RPI_POWER_DOMAIN_COUNT];
};
/*
* Packet definition used by RPI_FIRMWARE_SET_POWER_STATE and
* RPI_FIRMWARE_SET_DOMAIN_STATE
*/
struct rpi_power_domain_packet {
u32 domain;
u32 on;
soc: bcm: raspberrypi-power: Fix use of __packed Commit a09cd356586d ("ARM: bcm2835: add rpi power domain driver") attempted to annotate the structure rpi_power_domain_packet with __packed but introduced a typo and made it named __packet instead. Just drop the annotation since the structure is naturally aligned already. Fixes: a09cd356586d ("ARM: bcm2835: add rpi power domain driver") Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
2018-04-02 00:42:25 +08:00
};
ARM: bcm2835: add rpi power domain driver This patch adds support for several power domains on Raspberry Pi, including USB (so it can be enabled even if the bootloader didn't do it), and graphics. This patch is the combined work of Eric Anholt (who wrote USB support inside of the Raspberry Pi firmware driver, and wrote the non-USB domain support) and Alexander Aring (who separated the original USB work out from the firmware driver). Signed-off-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: Eric Anholt <eric@anholt.net> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Kevin Hilman <khilman@linaro.org>
2015-12-17 08:26:47 +08:00
/*
* Asks the firmware to enable or disable power on a specific power
* domain.
*/
static int rpi_firmware_set_power(struct rpi_power_domain *rpi_domain, bool on)
{
struct rpi_power_domain_packet packet;
packet.domain = rpi_domain->domain;
packet.on = on;
return rpi_firmware_property(rpi_domain->fw,
rpi_domain->old_interface ?
RPI_FIRMWARE_SET_POWER_STATE :
RPI_FIRMWARE_SET_DOMAIN_STATE,
&packet, sizeof(packet));
}
static int rpi_domain_off(struct generic_pm_domain *domain)
{
struct rpi_power_domain *rpi_domain =
container_of(domain, struct rpi_power_domain, base);
return rpi_firmware_set_power(rpi_domain, false);
}
static int rpi_domain_on(struct generic_pm_domain *domain)
{
struct rpi_power_domain *rpi_domain =
container_of(domain, struct rpi_power_domain, base);
return rpi_firmware_set_power(rpi_domain, true);
}
static void rpi_common_init_power_domain(struct rpi_power_domains *rpi_domains,
int xlate_index, const char *name)
{
struct rpi_power_domain *dom = &rpi_domains->domains[xlate_index];
dom->fw = rpi_domains->fw;
dom->base.name = name;
dom->base.power_on = rpi_domain_on;
dom->base.power_off = rpi_domain_off;
/*
* Treat all power domains as off at boot.
*
* The firmware itself may be keeping some domains on, but
* from Linux's perspective all we control is the refcounts
* that we give to the firmware, and we can't ask the firmware
* to turn off something that we haven't ourselves turned on.
*/
pm_genpd_init(&dom->base, NULL, true);
rpi_domains->xlate.domains[xlate_index] = &dom->base;
}
static void rpi_init_power_domain(struct rpi_power_domains *rpi_domains,
int xlate_index, const char *name)
{
struct rpi_power_domain *dom = &rpi_domains->domains[xlate_index];
if (!rpi_domains->has_new_interface)
return;
/* The DT binding index is the firmware's domain index minus one. */
dom->domain = xlate_index + 1;
rpi_common_init_power_domain(rpi_domains, xlate_index, name);
}
static void rpi_init_old_power_domain(struct rpi_power_domains *rpi_domains,
int xlate_index, int domain,
const char *name)
{
struct rpi_power_domain *dom = &rpi_domains->domains[xlate_index];
dom->old_interface = true;
dom->domain = domain;
rpi_common_init_power_domain(rpi_domains, xlate_index, name);
}
/*
* Detects whether the firmware supports the new power domains interface.
*
* The firmware doesn't actually return an error on an unknown tag,
* and just skips over it, so we do the detection by putting an
* unexpected value in the return field and checking if it was
* unchanged.
*/
static bool
rpi_has_new_domain_support(struct rpi_power_domains *rpi_domains)
{
struct rpi_power_domain_packet packet;
int ret;
packet.domain = RPI_POWER_DOMAIN_ARM;
packet.on = ~0;
ret = rpi_firmware_property(rpi_domains->fw,
RPI_FIRMWARE_GET_DOMAIN_STATE,
&packet, sizeof(packet));
return ret == 0 && packet.on != ~0;
}
static int rpi_power_probe(struct platform_device *pdev)
{
struct device_node *fw_np;
struct device *dev = &pdev->dev;
struct rpi_power_domains *rpi_domains;
rpi_domains = devm_kzalloc(dev, sizeof(*rpi_domains), GFP_KERNEL);
if (!rpi_domains)
return -ENOMEM;
rpi_domains->xlate.domains =
treewide: devm_kzalloc() -> devm_kcalloc() The devm_kzalloc() function has a 2-factor argument form, devm_kcalloc(). This patch replaces cases of: devm_kzalloc(handle, a * b, gfp) with: devm_kcalloc(handle, a * b, gfp) as well as handling cases of: devm_kzalloc(handle, a * b * c, gfp) with: devm_kzalloc(handle, array3_size(a, b, c), gfp) as it's slightly less ugly than: devm_kcalloc(handle, array_size(a, b), c, gfp) This does, however, attempt to ignore constant size factors like: devm_kzalloc(handle, 4 * 1024, gfp) though any constants defined via macros get caught up in the conversion. Any factors with a sizeof() of "unsigned char", "char", and "u8" were dropped, since they're redundant. Some manual whitespace fixes were needed in this patch, as Coccinelle really liked to write "=devm_kcalloc..." instead of "= devm_kcalloc...". The Coccinelle script used for this was: // Fix redundant parens around sizeof(). @@ expression HANDLE; type TYPE; expression THING, E; @@ ( devm_kzalloc(HANDLE, - (sizeof(TYPE)) * E + sizeof(TYPE) * E , ...) | devm_kzalloc(HANDLE, - (sizeof(THING)) * E + sizeof(THING) * E , ...) ) // Drop single-byte sizes and redundant parens. @@ expression HANDLE; expression COUNT; typedef u8; typedef __u8; @@ ( devm_kzalloc(HANDLE, - sizeof(u8) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(__u8) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(char) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(unsigned char) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(u8) * COUNT + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(__u8) * COUNT + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(char) * COUNT + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(unsigned char) * COUNT + COUNT , ...) ) // 2-factor product with sizeof(type/expression) and identifier or constant. @@ expression HANDLE; type TYPE; expression THING; identifier COUNT_ID; constant COUNT_CONST; @@ ( - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * (COUNT_ID) + COUNT_ID, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * COUNT_ID + COUNT_ID, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * (COUNT_CONST) + COUNT_CONST, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * COUNT_CONST + COUNT_CONST, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * (COUNT_ID) + COUNT_ID, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * COUNT_ID + COUNT_ID, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * (COUNT_CONST) + COUNT_CONST, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * COUNT_CONST + COUNT_CONST, sizeof(THING) , ...) ) // 2-factor product, only identifiers. @@ expression HANDLE; identifier SIZE, COUNT; @@ - devm_kzalloc + devm_kcalloc (HANDLE, - SIZE * COUNT + COUNT, SIZE , ...) // 3-factor product with 1 sizeof(type) or sizeof(expression), with // redundant parens removed. @@ expression HANDLE; expression THING; identifier STRIDE, COUNT; type TYPE; @@ ( devm_kzalloc(HANDLE, - sizeof(TYPE) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) ) // 3-factor product with 2 sizeof(variable), with redundant parens removed. @@ expression HANDLE; expression THING1, THING2; identifier COUNT; type TYPE1, TYPE2; @@ ( devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(TYPE2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) ) // 3-factor product, only identifiers, with redundant parens removed. @@ expression HANDLE; identifier STRIDE, SIZE, COUNT; @@ ( devm_kzalloc(HANDLE, - (COUNT) * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - (COUNT) * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - (COUNT) * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - (COUNT) * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) ) // Any remaining multi-factor products, first at least 3-factor products, // when they're not all constants... @@ expression HANDLE; expression E1, E2, E3; constant C1, C2, C3; @@ ( devm_kzalloc(HANDLE, C1 * C2 * C3, ...) | devm_kzalloc(HANDLE, - (E1) * E2 * E3 + array3_size(E1, E2, E3) , ...) | devm_kzalloc(HANDLE, - (E1) * (E2) * E3 + array3_size(E1, E2, E3) , ...) | devm_kzalloc(HANDLE, - (E1) * (E2) * (E3) + array3_size(E1, E2, E3) , ...) | devm_kzalloc(HANDLE, - E1 * E2 * E3 + array3_size(E1, E2, E3) , ...) ) // And then all remaining 2 factors products when they're not all constants, // keeping sizeof() as the second factor argument. @@ expression HANDLE; expression THING, E1, E2; type TYPE; constant C1, C2, C3; @@ ( devm_kzalloc(HANDLE, sizeof(THING) * C2, ...) | devm_kzalloc(HANDLE, sizeof(TYPE) * C2, ...) | devm_kzalloc(HANDLE, C1 * C2 * C3, ...) | devm_kzalloc(HANDLE, C1 * C2, ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * (E2) + E2, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * E2 + E2, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * (E2) + E2, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * E2 + E2, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - (E1) * E2 + E1, E2 , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - (E1) * (E2) + E1, E2 , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - E1 * E2 + E1, E2 , ...) ) Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-13 05:07:58 +08:00
devm_kcalloc(dev,
RPI_POWER_DOMAIN_COUNT,
sizeof(*rpi_domains->xlate.domains),
GFP_KERNEL);
ARM: bcm2835: add rpi power domain driver This patch adds support for several power domains on Raspberry Pi, including USB (so it can be enabled even if the bootloader didn't do it), and graphics. This patch is the combined work of Eric Anholt (who wrote USB support inside of the Raspberry Pi firmware driver, and wrote the non-USB domain support) and Alexander Aring (who separated the original USB work out from the firmware driver). Signed-off-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: Eric Anholt <eric@anholt.net> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Kevin Hilman <khilman@linaro.org>
2015-12-17 08:26:47 +08:00
if (!rpi_domains->xlate.domains)
return -ENOMEM;
rpi_domains->xlate.num_domains = RPI_POWER_DOMAIN_COUNT;
fw_np = of_parse_phandle(pdev->dev.of_node, "firmware", 0);
if (!fw_np) {
dev_err(&pdev->dev, "no firmware node\n");
return -ENODEV;
}
soc: bcm: raspberrypi-power: Release firmware handle on unbind Use devm_rpi_firmware_get() so as to make sure we release RPi's firmware interface when unbinding the device. Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
2021-01-18 20:32:39 +08:00
rpi_domains->fw = devm_rpi_firmware_get(&pdev->dev, fw_np);
ARM: bcm2835: add rpi power domain driver This patch adds support for several power domains on Raspberry Pi, including USB (so it can be enabled even if the bootloader didn't do it), and graphics. This patch is the combined work of Eric Anholt (who wrote USB support inside of the Raspberry Pi firmware driver, and wrote the non-USB domain support) and Alexander Aring (who separated the original USB work out from the firmware driver). Signed-off-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: Eric Anholt <eric@anholt.net> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Kevin Hilman <khilman@linaro.org>
2015-12-17 08:26:47 +08:00
of_node_put(fw_np);
if (!rpi_domains->fw)
return -EPROBE_DEFER;
rpi_domains->has_new_interface =
rpi_has_new_domain_support(rpi_domains);
rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_I2C0, "I2C0");
rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_I2C1, "I2C1");
rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_I2C2, "I2C2");
rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_VIDEO_SCALER,
"VIDEO_SCALER");
rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_VPU1, "VPU1");
rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_HDMI, "HDMI");
/*
* Use the old firmware interface for USB power, so that we
* can turn it on even if the firmware hasn't been updated.
*/
rpi_init_old_power_domain(rpi_domains, RPI_POWER_DOMAIN_USB,
RPI_OLD_POWER_DOMAIN_USB, "USB");
rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_VEC, "VEC");
rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_JPEG, "JPEG");
rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_H264, "H264");
rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_V3D, "V3D");
rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_ISP, "ISP");
rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_UNICAM0, "UNICAM0");
rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_UNICAM1, "UNICAM1");
rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_CCP2RX, "CCP2RX");
rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_CSI2, "CSI2");
rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_CPI, "CPI");
rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_DSI0, "DSI0");
rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_DSI1, "DSI1");
rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_TRANSPOSER,
"TRANSPOSER");
rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_CCP2TX, "CCP2TX");
rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_CDP, "CDP");
rpi_init_power_domain(rpi_domains, RPI_POWER_DOMAIN_ARM, "ARM");
of_genpd_add_provider_onecell(dev->of_node, &rpi_domains->xlate);
platform_set_drvdata(pdev, rpi_domains);
return 0;
}
static const struct of_device_id rpi_power_of_match[] = {
{ .compatible = "raspberrypi,bcm2835-power", },
{},
};
MODULE_DEVICE_TABLE(of, rpi_power_of_match);
static struct platform_driver rpi_power_driver = {
.driver = {
.name = "raspberrypi-power",
.of_match_table = rpi_power_of_match,
},
.probe = rpi_power_probe,
};
builtin_platform_driver(rpi_power_driver);
MODULE_AUTHOR("Alexander Aring <aar@pengutronix.de>");
MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
MODULE_DESCRIPTION("Raspberry Pi power domain driver");