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5611fe48c5
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>
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| .. | ||
| bsc913x_rdb.c | ||
| common.c | ||
| corenet_ds.c | ||
| corenet_ds.h | ||
| ge_imp3a.c | ||
| Kconfig | ||
| ksi8560.c | ||
| Makefile | ||
| mpc85xx_ads.c | ||
| mpc85xx_cds.c | ||
| mpc85xx_ds.c | ||
| mpc85xx_mds.c | ||
| mpc85xx_rdb.c | ||
| mpc85xx.h | ||
| mpc8536_ds.c | ||
| p1010rdb.c | ||
| p1022_ds.c | ||
| p1022_rdk.c | ||
| p1023_rds.c | ||
| p2041_rdb.c | ||
| p3041_ds.c | ||
| p4080_ds.c | ||
| p5020_ds.c | ||
| p5040_ds.c | ||
| qemu_e500.c | ||
| sbc8548.c | ||
| sgy_cts1000.c | ||
| smp.c | ||
| smp.h | ||
| socrates_fpga_pic.c | ||
| socrates_fpga_pic.h | ||
| socrates.c | ||
| stx_gp3.c | ||
| tqm85xx.c | ||
| xes_mpc85xx.c | ||