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tpm: st33zp24: Add support for acpi probing for spi device.

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Add support for acpi probing. SMO3324 is used for st33zp24.
It has been tested with the following acpi node on Minnowboard:

Device (TPM1)
{
	Name (_ADR, Zero)  // _ADR: Address
	Name (_HID, "SMO3324")  // _HID: Hardware ID
	Name (_CID, "SMO3324")  // _CID: Compatible ID
	Name (_DDN, "SMO TPM")  // _DDN: DOS Device Name
	Name (_UID, One)  // _UID: Unique ID
	Method (_CRS, 0, NotSerialized)  // _CRS: Current Resource Settings
	{
		Name (SBUF, ResourceTemplate ()
		{
			SpiSerialBus (0, PolarityLow, FourWireMode, 8,
				      ControllerInitiated, 4000000, ClockPolarityLow,
				      ClockPhaseFirst, "\\_SB.SPI1",
				      0x00, ResourceConsumer, ,)
			GpioInt (Edge, ActiveHigh, ExclusiveAndWake, PullNone, 0x0000,
				 "\\_SB.GPO2", 0x00, ResourceConsumer, ,)
			{       // Pin list
				0x0001
			}
			GpioIo (Exclusive, PullDefault, 0x0000, 0x0000, IoRestrictionOutputOnly,
				"\\_SB.GPO2", 0x00, ResourceConsumer, ,)
			{       // Pin list
				0x0002,
			}
		})
		Return (SBUF) /* \_SB_.SPI1.TPM1._CRS.SBUF */
	}
	Method (_STA, 0, NotSerialized)  // _STA: Status
	{
		Return (0x0F)
	}
}

Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
This commit is contained in:
Christophe RICARD 2016-02-23 22:25:49 +01:00 committed by Jarkko Sakkinen
parent 22eb90db93
commit 86ff205b8e
1 changed files with 49 additions and 0 deletions
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49
drivers/char/tpm/st33zp24/spi.c
View File

@ -19,8 +19,10 @@
#include <linux/module.h>
#include <linux/spi/spi.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/of_irq.h>
#include <linux/of_gpio.h>
#include <linux/acpi.h>
#include <linux/tpm.h>
#include <linux/platform_data/st33zp24.h>
@ -227,6 +229,42 @@ static const struct st33zp24_phy_ops spi_phy_ops = {
.recv = st33zp24_spi_recv,
};
static int st33zp24_spi_acpi_request_resources(struct st33zp24_spi_phy *phy)
{
struct spi_device *spi_dev = phy->spi_device;
const struct acpi_device_id *id;
struct gpio_desc *gpiod_lpcpd;
struct device *dev;
if (!spi_dev)
return -EINVAL;
dev = &spi_dev->dev;
/* Match the struct device against a given list of ACPI IDs */
id = acpi_match_device(dev->driver->acpi_match_table, dev);
if (!id)
return -ENODEV;
/* Get LPCPD GPIO from ACPI */
gpiod_lpcpd = devm_gpiod_get_index(dev, "TPM IO LPCPD", 1,
GPIOD_OUT_HIGH);
if (IS_ERR(gpiod_lpcpd)) {
dev_err(dev, "Failed to retrieve lpcpd-gpios from acpi.\n");
phy->io_lpcpd = -1;
/*
* lpcpd pin is not specified. This is not an issue as
* power management can be also managed by TPM specific
* commands. So leave with a success status code.
*/
return 0;
}
phy->io_lpcpd = desc_to_gpio(gpiod_lpcpd);
return 0;
}
static int st33zp24_spi_of_request_resources(struct st33zp24_spi_phy *phy)
{
struct device_node *pp;
@ -328,6 +366,10 @@ static int st33zp24_spi_probe(struct spi_device *dev)
ret = st33zp24_spi_request_resources(dev, phy);
if (ret)
return ret;
} else if (ACPI_HANDLE(&dev->dev)) {
ret = st33zp24_spi_acpi_request_resources(phy);
if (ret)
return ret;
}
phy->latency = st33zp24_spi_evaluate_latency(phy);
@ -362,6 +404,12 @@ static const struct of_device_id of_st33zp24_spi_match[] = {
};
MODULE_DEVICE_TABLE(of, of_st33zp24_spi_match);
static const struct acpi_device_id st33zp24_spi_acpi_match[] = {
{"SMO3324"},
{}
};
MODULE_DEVICE_TABLE(acpi, st33zp24_spi_acpi_match);
static SIMPLE_DEV_PM_OPS(st33zp24_spi_ops, st33zp24_pm_suspend,
st33zp24_pm_resume);
@ -370,6 +418,7 @@ static struct spi_driver st33zp24_spi_driver = {
.name = TPM_ST33_SPI,
.pm = &st33zp24_spi_ops,
.of_match_table = of_match_ptr(of_st33zp24_spi_match),
.acpi_match_table = ACPI_PTR(st33zp24_spi_acpi_match),
},
.probe = st33zp24_spi_probe,
.remove = st33zp24_spi_remove,