[PATCH 0/3] GPIO driver to turn power off

A few of the Kirkwood systems use a GPIO line to turn the power off on
shutdown. They request the GPIO line in the board setup code,
optionally setting it as an output and driving it inactive. They then
register a function for pm_power_off. At the end of the shutdown, this
function is called. The GPIO line is configured as an output, if not
already so, and then driven active. In order to cover the use case of
edges rather then levels, triggering power off, the GPIO line is then
toggled active and later inactive. This should allow the driver to be
used by PXA which also has boards using the same scheme.

The driver code was initially developed by Jamie Lentin and extended
to cover the PXA case by Andrew Lunn.

Andrew Lunn (2):
  ARM: Kirkwood: Convert DNSKW to use gpio-poweroff.
  ARM: Kirkwood: Convert IB62x0 to use gpio-poweroff.

Jamie Lentin (1):
  gpio: Add simple poweroff-gpio driver

 .../devicetree/bindings/gpio/gpio-poweroff.txt     |   22 ++++
 arch/arm/boot/dts/kirkwood-dnskw.dtsi              |    5 +
 arch/arm/boot/dts/kirkwood-ib62x0.dts              |    6 +
 arch/arm/mach-kirkwood/Kconfig                     |    1 +
 arch/arm/mach-kirkwood/board-dnskw.c               |   12 --
 arch/arm/mach-kirkwood/board-ib62x0.c              |   13 --
 drivers/gpio/Kconfig                               |   10 ++
 drivers/gpio/Makefile                              |    2 +
 drivers/gpio/gpio-poweroff.c                       |  129 ++++++++++++++++++++
 9 files changed, 175 insertions(+), 25 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/gpio/gpio-poweroff.txt
 create mode 100644 drivers/gpio/gpio-poweroff.c

-- 
1.7.10.4

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
---
 arch/arm/boot/dts/kirkwood-ib62x0.dts |    6 ++++++
 arch/arm/mach-kirkwood/board-ib62x0.c |   13 -------------
 2 files changed, 6 insertions(+), 13 deletions(-)

diff --git a/arch/arm/boot/dts/kirkwood-ib62x0.dts b/arch/arm/boot/dts/kirkwood-ib62x0.dts
index 66794ed..9b0e2e3 100644
--- a/arch/arm/boot/dts/kirkwood-ib62x0.dts
+++ b/arch/arm/boot/dts/kirkwood-ib62x0.dts

@@ -79,4 +79,10 @@
 			gpios = <&gpio0 27 0>;
 		};
 	};
+	gpio_poweroff {
+		compatible = "gpio-poweroff";
+		gpios = <&gpio0 24 1>;
+	};
+
+
 };

diff --git a/arch/arm/mach-kirkwood/board-ib62x0.c b/arch/arm/mach-kirkwood/board-ib62x0.c
index cfc47f8..7b8adf5 100644
--- a/arch/arm/mach-kirkwood/board-ib62x0.c
+++ b/arch/arm/mach-kirkwood/board-ib62x0.c

@@ -17,7 +17,6 @@
 #include <linux/mtd/partitions.h>
 #include <linux/ata_platform.h>
 #include <linux/mv643xx_eth.h>
-#include <linux/gpio.h>
 #include <linux/input.h>
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>

@@ -25,8 +24,6 @@
 #include "common.h"
 #include "mpp.h"
 
-#define IB62X0_GPIO_POWER_OFF	24
-
 static struct mv643xx_eth_platform_data ib62x0_ge00_data = {
 	.phy_addr	= MV643XX_ETH_PHY_ADDR(8),
 };

@@ -49,11 +46,6 @@ static unsigned int ib62x0_mpp_config[] __initdata = {
 	0
 };
 
-static void ib62x0_power_off(void)
-{
-	gpio_set_value(IB62X0_GPIO_POWER_OFF, 1);
-}
-
 void __init ib62x0_init(void)
 {
 	/*

@@ -63,9 +55,4 @@ void __init ib62x0_init(void)
 
 	kirkwood_ehci_init();
 	kirkwood_ge00_init(&ib62x0_ge00_data);
-	if (gpio_request(IB62X0_GPIO_POWER_OFF, "ib62x0:power:off") == 0 &&
-	    gpio_direction_output(IB62X0_GPIO_POWER_OFF, 0) == 0)
-		pm_power_off = ib62x0_power_off;
-	else
-		pr_err("board-ib62x0: failed to configure power-off GPIO\n");
 }

-- 
1.7.10.4