pdm sdi0~3 pins are optional, for example, if 4ch required,
only sdi0~1 need to be enabled.

Signed-off-by: Sugar Zhang <sugar.zh...@rock-chips.com>
---

Changes in v2: None

 Documentation/devicetree/bindings/sound/rockchip,pdm.txt | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/sound/rockchip,pdm.txt 
b/Documentation/devicetree/bindings/sound/rockchip,pdm.txt
index 921729d..2ad66f6 100644
--- a/Documentation/devicetree/bindings/sound/rockchip,pdm.txt
+++ b/Documentation/devicetree/bindings/sound/rockchip,pdm.txt
@@ -29,11 +29,14 @@ pdm: pdm@ff040000 {
        dma-names = "rx";
        pinctrl-names = "default", "sleep";
        pinctrl-0 = <&pdmm0_clk
-                    &pdmm0_fsync
                     &pdmm0_sdi0
                     &pdmm0_sdi1
                     &pdmm0_sdi2
                     &pdmm0_sdi3>;
-       pinctrl-1 = <&pdmm0_sleep>;
+       pinctrl-1 = <&pdmm0_clk_sleep
+                    &pdmm0_sdi0_sleep
+                    &pdmm0_sdi1_sleep
+                    &pdmm0_sdi2_sleep
+                    &pdmm0_sdi3_sleep>;
        status = "disabled";
 };
-- 
2.7.4


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