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| author | Benjamin Collins <ben.c@servergy.com> | 2012-12-17 08:19:28 +0400 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-01-29 04:35:05 +0400 |
| commit | 5611fe48c545a22e62273428ed74c9bfae4a9406 (patch) | |
| tree | 79514228d518fe3adb823290879190157d299c1c /arch/powerpc/platforms/85xx/Kconfig | |
| parent | 34f364fef475f5d960b74bf074d65392ece50235 (diff) | |
| download | linux-5611fe48c545a22e62273428ed74c9bfae4a9406.tar.xz | |
powerpc: Add support for CTS-1000 GPIO controlled system poweroff
CTS-1000 is based on P4080. GPIO 27 is used to signal the FPGA to
switch off power, and also associates IRQ 8 with front-panel button
press (which we use to call orderly_poweroff()).
The relevant device-tree looks like this:
gpio0: gpio@130000 {
compatible = "fsl,qoriq-gpio";
reg = <0x130000 0x1000>;
interrupts = <55 2 0 0>;
#gpio-cells = <2>;
gpio-controller;
/* Allows powering off the system via GPIO signal. */
gpio-halt@27 {
compatible = "sgy,gpio-halt";
gpios = <&gpio0 27 0>;
interrupts = <8 1 0 0>;
};
};
Because the driver cannot match on sgy,gpio-halt (because the node is never
processed through of_platform), it matches on fsl,qoriq-gpio and then
checks child nodes for the matching sgy,gpio-halt. This also ensures that
the GPIO controller is detected prior to sgy_cts1000's probe callback,
since that node wont match via of_platform until the controller is
registered.
Also, because the GPIO handler for triggering system poweroff might sleep,
the IRQ uses a workqueue to call orderly_poweroff().
As a final note, this driver may be expanded for other features specific to
the CTS-1000.
Signed-off-by: Ben Collins <ben.c@servergy.com>
Cc: Jack Smith <jack.s@servergy.com>
Cc: Vihar Rai <vihar.r@servergy.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/platforms/85xx/Kconfig')
| -rw-r--r-- | arch/powerpc/platforms/85xx/Kconfig | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/85xx/Kconfig b/arch/powerpc/platforms/85xx/Kconfig index 02d02a09942d..651788cbc6e6 100644 --- a/arch/powerpc/platforms/85xx/Kconfig +++ b/arch/powerpc/platforms/85xx/Kconfig @@ -245,6 +245,14 @@ config P4080_DS help This option enables support for the P4080 DS board +config SGY_CTS1000 + tristate "Servergy CTS-1000 support" + select GPIOLIB + select OF_GPIO + depends on P4080_DS + help + Enable this to support functionality in Servergy's CTS-1000 systems. + endif # PPC32 config P5020_DS |