[U-Boot] [v3 10/10] spi: cadence_qspi: add device tree binding doc

[Vikas Manocha]

This patch adds the device tree binding doc for the cadence qspi controller &
also removes the not needed properties from the device trees using this
controller.

Signed-off-by: Vikas Manocha <vikas.manocha at st.com>
---

Changes in v3: added new

 arch/arm/dts/socfpga.dtsi                    |    3 ---
 arch/arm/dts/socfpga_cyclone5_socrates.dts   |    1 -
 arch/arm/dts/stv0991.dts                     |    4 ----
 doc/device-tree-bindings/spi/spi-cadence.txt |   28 ++++++++++++++++++++++++++
 4 files changed, 28 insertions(+), 8 deletions(-)
 create mode 100644 doc/device-tree-bindings/spi/spi-cadence.txt

diff --git a/arch/arm/dts/socfpga.dtsi b/arch/arm/dts/socfpga.dtsi
index 9b12420..35e6561 100644
--- a/arch/arm/dts/socfpga.dtsi
+++ b/arch/arm/dts/socfpga.dtsi
@@ -636,9 +636,6 @@
 				<0xffa00000 0x1000>;
 			interrupts = <0 151 4>;
 			clocks = <&qspi_clk>;
-			ext-decoder = <0>;  /* external decoder */
-			num-cs = <4>;
-			fifo-depth = <128>;
 			sram-size = <128>;
 			bus-num = <2>;
 			status = "disabled";
diff --git a/arch/arm/dts/socfpga_cyclone5_socrates.dts b/arch/arm/dts/socfpga_cyclone5_socrates.dts
index ea30483..557787b 100644
--- a/arch/arm/dts/socfpga_cyclone5_socrates.dts
+++ b/arch/arm/dts/socfpga_cyclone5_socrates.dts
@@ -56,7 +56,6 @@
 		m25p,fast-read;
 		page-size = <256>;
 		block-size = <16>; /* 2^16, 64KB */
-		read-delay = <4>;  /* delay value in read data capture register */
 		tshsl-ns = <50>;
 		tsd2d-ns = <50>;
 		tchsh-ns = <4>;
diff --git a/arch/arm/dts/stv0991.dts b/arch/arm/dts/stv0991.dts
index 556df82..601148e 100644
--- a/arch/arm/dts/stv0991.dts
+++ b/arch/arm/dts/stv0991.dts
@@ -32,9 +32,6 @@
 			reg = <0x80203000 0x100>,
 				<0x40000000 0x1000000>;
 			clocks = <3750000>;
-			ext-decoder = <0>; /* external decoder */
-			num-cs = <4>;
-			fifo-depth = <256>;
 			sram-size = <256>;
 			bus-num = <0>;
 			status = "okay";
@@ -48,7 +45,6 @@
 				m25p,fast-read;
 				page-size = <256>;
 				block-size = <16>; 	/* 2^16, 64KB */
-				read-delay = <4>;	/* delay value in read data capture register */
 				tshsl-ns = <50>;
 				tsd2d-ns = <50>;
 				tchsh-ns = <4>;
diff --git a/doc/device-tree-bindings/spi/spi-cadence.txt b/doc/device-tree-bindings/spi/spi-cadence.txt
new file mode 100644
index 0000000..c1e2233
--- /dev/null
+++ b/doc/device-tree-bindings/spi/spi-cadence.txt
@@ -0,0 +1,28 @@
+Cadence QSPI controller device tree bindings
+--------------------------------------------
+
+Required properties:
+- compatible		: should be "cadence,qspi".
+- reg			: 1.Physical base address and size of SPI registers map.
+			  2. Physical base address & size of NOR Flash.
+- clocks		: Clock phandles (see clock bindings for details).
+- sram-size		: spi controller sram size.
+- status		: enable in requried dts.
+
+connected flash properties
+--------------------------
+
+- spi-max-frequency	: Max supported spi frequency.
+- page-size		: Flash page size.
+- block-size		: Flash memory block size.
+- tshsl-ns		: Added delay in master reference clocks (ref_clk) for
+			  the length that the master mode chip select outputs
+			  are de-asserted between transactions.
+- tsd2d-ns		: Delay in master reference clocks (ref_clk) between one
+			  chip select being de-activated and the activation of
+			  another.
+- tchsh-ns		: Delay in master reference clocks between last bit of
+			  current transaction and de-asserting the device chip
+			  select (n_ss_out).
+- tslch-ns		: Delay in master reference clocks between setting
+			  n_ss_out low and first bit transfer
-- 
1.7.9.5