[U-Boot] [PATCH 1/2] pci: mx6: Implement power callback

[Marek Vasut]

Implement a callback to toggle the slot power supply. The callback
can be overriden in case some more complex power supply for the slot
was implemented in hardware, yet for the usual case, one can define
a GPIO which toggles the power to the slot.

Signed-off-by: Marek Vasut <marex at denx.de>
Cc: Stefano Babic <sbabic at denx.de>
Cc: Fabio Estevam <fabio.estevam at freescale.com>
Cc: Liu Ying <Ying.Liu at freescale.com>
---
 drivers/pci/pcie_imx.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/pcie_imx.c b/drivers/pci/pcie_imx.c
index 34377e9..8951a93 100644
--- a/drivers/pci/pcie_imx.c
+++ b/drivers/pci/pcie_imx.c
@@ -451,6 +451,17 @@ static int imx6_pcie_init_phy(void)
 	return 0;
 }
 
+__weak int imx6_pcie_toggle_power(void)
+{
+#ifdef CONFIG_PCIE_IMX_POWER_GPIO
+	gpio_direction_output(CONFIG_PCIE_IMX_POWER_GPIO, 0);
+	mdelay(20);
+	gpio_set_value(CONFIG_PCIE_IMX_POWER_GPIO, 1);
+	mdelay(20);
+#endif
+	return 0;
+}
+
 __weak int imx6_pcie_toggle_reset(void)
 {
 	/*
@@ -496,7 +507,7 @@ static int imx6_pcie_deassert_core_reset(void)
 {
 	struct iomuxc *iomuxc_regs = (struct iomuxc *)IOMUXC_BASE_ADDR;
 
-	/* FIXME: Power-up GPIO goes here. */
+	imx6_pcie_toggle_power();
 
 	/* Enable PCIe */
 	clrbits_le32(&iomuxc_regs->gpr[1], IOMUXC_GPR1_TEST_POWERDOWN);
-- 
1.9.0