add pmu sram node for suspend, add global_pwroff pinctrl.
The pmu sram is used to store the resume code.
global_pwroff is held low level at work, it would be pull to high
when entering suspend. reference this in the board DTS file since
some boards need it.

Signed-off-by: Tony Xie <x...@rock-chips.com>
Signed-off-by: Chris Zhong <z...@rock-chips.com>
Reviewed-by: Doug Anderson <diand...@chromium.org>
Tested-by: Doug Anderson <diand...@chromium.org>

---

Changes in v7: None
Changes in v6:
- change pmu_intmem@ff720000 to sram@ff720000

Changes in v5:
- change size to 4k

Changes in v4: None
Changes in v3: None
Changes in v2:
- put "rockchip,rk3288-pmu-sram" to first

 arch/arm/boot/dts/rk3288.dtsi | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/arm/boot/dts/rk3288.dtsi b/arch/arm/boot/dts/rk3288.dtsi
index cfc4378..0747c30 100644
--- a/arch/arm/boot/dts/rk3288.dtsi
+++ b/arch/arm/boot/dts/rk3288.dtsi
@@ -462,6 +462,11 @@
                status = "disabled";
        };
 
+       sram@ff720000 {
+               compatible = "rockchip,rk3288-pmu-sram", "mmio-sram";
+               reg = <0xff720000 0x1000>;
+       };
+
        pmu: power-management@ff730000 {
                compatible = "rockchip,rk3288-pmu", "syscon";
                reg = <0xff730000 0x100>;
@@ -667,6 +672,12 @@
                        bias-disable;
                };
 
+               sleep {
+                       global_pwroff: global-pwroff {
+                               rockchip,pins = <0 0 RK_FUNC_1 &pcfg_pull_none>;
+                       };
+               };
+
                i2c0 {
                        i2c0_xfer: i2c0-xfer {
                                rockchip,pins = <0 15 RK_FUNC_1 
&pcfg_pull_none>,
-- 
1.9.1

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