Change the "gpio_slave" and "apb_csr" to optional, the "gpio_slave"
is not used in current code, and "apb_csr" is not used by some platforms.

Signed-off-by: Hou Zhiqiang <zhiqiang....@nxp.com>
Acked-by: Subrahmanya Lingappa <l.subrahma...@mobiveil.co.in>
Acked-by: Rob Herring <r...@kernel.org>
Reviewed-by: Minghuan Lian <minghuan.l...@nxp.com>
Reviewed-by: Subrahmanya Lingappa <l.subrahma...@mobiveil.co.in>
---
V6:
 - Rebased the patch, no functional change.

 .../devicetree/bindings/pci/mobiveil-pcie.txt      |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/Documentation/devicetree/bindings/pci/mobiveil-pcie.txt 
b/Documentation/devicetree/bindings/pci/mobiveil-pcie.txt
index a618d47..6415699 100644
--- a/Documentation/devicetree/bindings/pci/mobiveil-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/mobiveil-pcie.txt
@@ -10,8 +10,10 @@ Required properties:
        interrupt source. The value must be 1.
 - compatible: Should contain "mbvl,gpex40-pcie"
 - reg: Should contain PCIe registers location and length
+       Mandatory:
        "config_axi_slave": PCIe controller registers
        "csr_axi_slave"   : Bridge config registers
+       Optional:
        "gpio_slave"      : GPIO registers to control slot power
        "apb_csr"         : MSI registers
 
-- 
1.7.1

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