Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 177 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/memory-controllers/mvebu-devbus.txt b/Documentation/devicetree/bindings/memory-controllers/mvebu-devbus.txt
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+Device tree bindings for MVEBU Device Bus controllers
+
+The Device Bus controller available in some Marvell's SoC allows to control
+different types of standard memory and I/O devices such as NOR, NAND, and FPGA.
+The actual devices are instantiated from the child nodes of a Device Bus node.
+
+Required properties:
+
+ - compatible:          Armada 370/XP SoC are supported using the
+                        "marvell,mvebu-devbus" compatible string.
+
+                        Orion5x SoC are supported using the
+                        "marvell,orion-devbus" compatible string.
+
+ - reg:                 A resource specifier for the register space.
+                        This is the base address of a chip select within
+			the controller's register space.
+                        (see the example below)
+
+ - #address-cells:      Must be set to 1
+ - #size-cells:         Must be set to 1
+ - ranges:              Must be set up to reflect the memory layout with four
+                        integer values for each chip-select line in use:
+                        0 <physical address of mapping> <size>
+
+Optional properties:
+
+ - devbus,keep-config   This property can optionally be used to keep
+                        using the timing parameters set by the
+                        bootloader. It makes all the timing properties
+                        described below unused.
+
+Timing properties for child nodes:
+
+Read parameters:
+
+ - devbus,turn-off-ps:  Defines the time during which the controller does not
+                        drive the AD bus after the completion of a device read.
+                        This prevents contentions on the Device Bus after a read
+                        cycle from a slow device.
+                        Mandatory, except if devbus,keep-config is used.
+
+ - devbus,bus-width:    Defines the bus width, in bits (e.g. <16>).
+                        Mandatory, except if devbus,keep-config is used.
+
+ - devbus,badr-skew-ps: Defines the time delay from from A[2:0] toggle,
+                        to read data sample. This parameter is useful for
+                        synchronous pipelined devices, where the address
+                        precedes the read data by one or two cycles.
+                        Mandatory, except if devbus,keep-config is used.
+
+ - devbus,acc-first-ps: Defines the time delay from the negation of
+                        ALE[0] to the cycle that the first read data is sampled
+                        by the controller.
+                        Mandatory, except if devbus,keep-config is used.
+
+ - devbus,acc-next-ps:  Defines the time delay between the cycle that
+                        samples data N and the cycle that samples data N+1
+                        (in burst accesses).
+                        Mandatory, except if devbus,keep-config is used.
+
+ - devbus,rd-setup-ps:  Defines the time delay between DEV_CSn assertion to
+			DEV_OEn assertion. If set to 0 (default),
+                        DEV_OEn and DEV_CSn are asserted at the same cycle.
+                        This parameter has no affect on <acc-first-ps> parameter
+                        (no affect on first data sample). Set <rd-setup-ps>
+                        to a value smaller than <acc-first-ps>.
+                        Mandatory for "marvell,mvebu-devbus" compatible string,
+                        except if devbus,keep-config is used.
+
+ - devbus,rd-hold-ps:   Defines the time between the last data sample to the
+			de-assertion of DEV_CSn. If set to 0 (default),
+			DEV_OEn and DEV_CSn are de-asserted at the same cycle
+			(the cycle of the last data sample).
+                        This parameter has no affect on DEV_OEn de-assertion.
+                        DEV_OEn is always de-asserted the next cycle after
+                        last data sampled. Also this parameter has no
+                        affect on <turn-off-ps> parameter.
+                        Set <rd-hold-ps> to a value smaller than <turn-off-ps>.
+                        Mandatory for "marvell,mvebu-devbus" compatible string,
+                        except if devbus,keep-config is used.
+
+Write parameters:
+
+ - devbus,ale-wr-ps:    Defines the time delay from the ALE[0] negation cycle
+			to the DEV_WEn assertion.
+                        Mandatory.
+
+ - devbus,wr-low-ps:    Defines the time during which DEV_WEn is active.
+                        A[2:0] and Data are kept valid as long as DEV_WEn
+                        is active. This parameter defines the setup time of
+                        address and data to DEV_WEn rise.
+                        Mandatory.
+
+ - devbus,wr-high-ps:   Defines the time during which DEV_WEn is kept
+                        inactive (high) between data beats of a burst write.
+                        DEV_A[2:0] and Data are kept valid (do not toggle) for
+                        <wr-high-ps> - <tick> ps.
+			This parameter defines the hold time of address and
+			data after DEV_WEn rise.
+                        Mandatory.
+
+ - devbus,sync-enable: Synchronous device enable.
+                       1: True
+                       0: False
+                       Mandatory for "marvell,mvebu-devbus" compatible string,
+                       except if devbus,keep-config is used.
+
+An example for an Armada XP GP board, with a 16 MiB NOR device as child
+is showed below. Note that the Device Bus driver is in charge of allocating
+the mbus address decoding window for each of its child devices.
+The window is created using the chip select specified in the child
+device node together with the base address and size specified in the ranges
+property. For instance, in the example below the allocated decoding window
+will start at base address 0xf0000000, with a size 0x1000000 (16 MiB)
+for chip select 0 (a.k.a DEV_BOOTCS).
+
+This address window handling is done in this mvebu-devbus only as a temporary
+solution. It will be removed when the support for mbus device tree binding is
+added.
+
+The reg property implicitly specifies the chip select as this:
+
+  0x10400: DEV_BOOTCS
+  0x10408: DEV_CS0
+  0x10410: DEV_CS1
+  0x10418: DEV_CS2
+  0x10420: DEV_CS3
+
+Example:
+
+	devbus-bootcs@d0010400 {
+		ranges = <0 0xf0000000 0x1000000>; /* @addr 0xf0000000, size 0x1000000 */
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		/* Device Bus parameters are required */
+
+		/* Read parameters */
+		devbus,bus-width    = <8>;
+		devbus,turn-off-ps  = <60000>;
+		devbus,badr-skew-ps = <0>;
+		devbus,acc-first-ps = <124000>;
+		devbus,acc-next-ps  = <248000>;
+		devbus,rd-setup-ps  = <0>;
+		devbus,rd-hold-ps   = <0>;
+
+		/* Write parameters */
+		devbus,sync-enable = <0>;
+		devbus,wr-high-ps  = <60000>;
+		devbus,wr-low-ps   = <60000>;
+		devbus,ale-wr-ps   = <60000>;
+
+		flash@0 {
+			compatible = "cfi-flash";
+
+			/* 16 MiB */
+			reg = <0 0x1000000>;
+			bank-width = <2>;
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			/*
+			 * We split the 16 MiB in two partitions,
+			 * just as an example.
+			 */
+			partition@0 {
+				label = "First";
+				reg = <0 0x800000>;
+			};
+
+			partition@800000 {
+				label = "Second";
+				reg = <0x800000 0x800000>;
+			};
+		};
+	};