gpio: sch: Add support for Intel Quark X1000 SoC

Intel Quark X1000 provides a total of 16 GPIOs. The GPIOs are split between
the legacy I/O bridge and the GPIO controller.

GPIO-SCH is the GPIO pins on legacy bridge for Intel Quark SoC.
Intel Quark X1000 has 2 GPIOs powered by the core power well and 6 from
the suspend power well.

This piece of work is derived from Dan O'Donovan's initial work for Quark
X1000 enabling.

Signed-off-by: Chang Rebecca Swee Fun <rebecca.swee.fun.chang@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

2 files changed, 15 insertions, 2 deletions

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index d5ee1710d1ff..cb235f3691bc 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -395,25 +395,32 @@ config GPIO_VR41XX
           Say yes here to support the NEC VR4100 series General-purpose I/O Uint
 
 config GPIO_SCH
-        tristate "Intel SCH/TunnelCreek/Centerton GPIO"
+        tristate "Intel SCH/TunnelCreek/Centerton/Quark X1000 GPIO"
         depends on PCI && X86
         select MFD_CORE
         select LPC_SCH
         help
           Say yes here to support GPIO interface on Intel Poulsbo SCH,
-          Intel Tunnel Creek processor or Intel Centerton processor.
+          Intel Tunnel Creek processor, Intel Centerton processor or
+          Intel Quark X1000 SoC.
+
           The Intel SCH contains a total of 14 GPIO pins. Ten GPIOs are
           powered by the core power rail and are turned off during sleep
           modes (S3 and higher). The remaining four GPIOs are powered by
           the Intel SCH suspend power supply. These GPIOs remain
           active during S3. The suspend powered GPIOs can be used to wake the
           system from the Suspend-to-RAM state.
+
           The Intel Tunnel Creek processor has 5 GPIOs powered by the
           core power rail and 9 from suspend power supply.
+
           The Intel Centerton processor has a total of 30 GPIO pins.
           Twenty-one are powered by the core power rail and 9 from the
           suspend power supply.
 
+          The Intel Quark X1000 SoC has 2 GPIOs powered by the core
+          power well and 6 from the suspend power well.
+
 config GPIO_ICH
         tristate "Intel ICH GPIO"
         depends on PCI && X86
diff --git a/drivers/gpio/gpio-sch.c b/drivers/gpio/gpio-sch.c
index 0a0cf1307d2f..0271022a66f6 100644
--- a/drivers/gpio/gpio-sch.c
+++ b/drivers/gpio/gpio-sch.c
@@ -230,6 +230,12 @@ static int sch_gpio_probe(struct platform_device *pdev)
                 sch->chip.ngpio = 30;
                 break;
 
+        case PCI_DEVICE_ID_INTEL_QUARK_X1000_ILB:
+                sch->core_base = 0;
+                sch->resume_base = 2;
+                sch->chip.ngpio = 8;
+                break;
+
         default:
                 return -ENODEV;
         }