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-MPC5200 Device Tree Bindings
-----------------------------
-
-(c) 2006-2009 Secret Lab Technologies Ltd
-Grant Likely <grant.likely@secretlab.ca>
-
-Naming conventions
-------------------
-For mpc5200 on-chip devices, the format for each compatible value is
-<chip>-<device>[-<mode>]. The OS should be able to match a device driver
-to the device based solely on the compatible value. If two drivers
-match on the compatible list; the 'most compatible' driver should be
-selected.
-
-The split between the MPC5200 and the MPC5200B leaves a bit of a
-conundrum. How should the compatible property be set up to provide
-maximum compatibility information; but still accurately describe the
-chip? For the MPC5200; the answer is easy. Most of the SoC devices
-originally appeared on the MPC5200. Since they didn't exist anywhere
-else; the 5200 compatible properties will contain only one item;
-"fsl,mpc5200-<device>".
-
-The 5200B is almost the same as the 5200, but not quite. It fixes
-silicon bugs and it adds a small number of enhancements. Most of the
-devices either provide exactly the same interface as on the 5200. A few
-devices have extra functions but still have a backwards compatible mode.
-To express this information as completely as possible, 5200B device trees
-should have two items in the compatible list:
- compatible = "fsl,mpc5200b-<device>","fsl,mpc5200-<device>";
-
-It is *strongly* recommended that 5200B device trees follow this convention
-(instead of only listing the base mpc5200 item).
-
-ie. ethernet on mpc5200: compatible = "fsl,mpc5200-fec";
- ethernet on mpc5200b: compatible = "fsl,mpc5200b-fec", "fsl,mpc5200-fec";
-
-Modal devices, like PSCs, also append the configured function to the
-end of the compatible field. ie. A PSC in i2s mode would specify
-"fsl,mpc5200-psc-i2s", not "fsl,mpc5200-i2s". This convention is chosen to
-avoid naming conflicts with non-psc devices providing the same
-function. For example, "fsl,mpc5200-spi" and "fsl,mpc5200-psc-spi" describe
-the mpc5200 simple spi device and a PSC spi mode respectively.
-
-At the time of writing, exact chip may be either 'fsl,mpc5200' or
-'fsl,mpc5200b'.
-
-The soc node
-------------
-This node describes the on chip SOC peripherals. Every mpc5200 based
-board will have this node, and as such there is a common naming
-convention for SOC devices.
-
-Required properties:
-name description
----- -----------
-ranges Memory range of the internal memory mapped registers.
- Should be <0 [baseaddr] 0xc000>
-reg Should be <[baseaddr] 0x100>
-compatible mpc5200: "fsl,mpc5200-immr"
- mpc5200b: "fsl,mpc5200b-immr"
-system-frequency 'fsystem' frequency in Hz; XLB, IPB, USB and PCI
- clocks are derived from the fsystem clock.
-bus-frequency IPB bus frequency in Hz. Clock rate
- used by most of the soc devices.
-
-soc child nodes
----------------
-Any on chip SOC devices available to Linux must appear as soc5200 child nodes.
-
-Note: The tables below show the value for the mpc5200. A mpc5200b device
-tree should use the "fsl,mpc5200b-<device>","fsl,mpc5200-<device>" form.
-
-Required soc5200 child nodes:
-name compatible Description
----- ---------- -----------
-cdm@<addr> fsl,mpc5200-cdm Clock Distribution
-interrupt-controller@<addr> fsl,mpc5200-pic need an interrupt
- controller to boot
-bestcomm@<addr> fsl,mpc5200-bestcomm Bestcomm DMA controller
-
-Recommended soc5200 child nodes; populate as needed for your board
-name compatible Description
----- ---------- -----------
-timer@<addr> fsl,mpc5200-gpt General purpose timers
-gpio@<addr> fsl,mpc5200-gpio MPC5200 simple gpio controller
-gpio@<addr> fsl,mpc5200-gpio-wkup MPC5200 wakeup gpio controller
-rtc@<addr> fsl,mpc5200-rtc Real time clock
-mscan@<addr> fsl,mpc5200-mscan CAN bus controller
-pci@<addr> fsl,mpc5200-pci PCI bridge
-serial@<addr> fsl,mpc5200-psc-uart PSC in serial mode
-i2s@<addr> fsl,mpc5200-psc-i2s PSC in i2s mode
-ac97@<addr> fsl,mpc5200-psc-ac97 PSC in ac97 mode
-spi@<addr> fsl,mpc5200-psc-spi PSC in spi mode
-irda@<addr> fsl,mpc5200-psc-irda PSC in IrDA mode
-spi@<addr> fsl,mpc5200-spi MPC5200 spi device
-ethernet@<addr> fsl,mpc5200-fec MPC5200 ethernet device
-ata@<addr> fsl,mpc5200-ata IDE ATA interface
-i2c@<addr> fsl,mpc5200-i2c I2C controller
-usb@<addr> fsl,mpc5200-ohci,ohci-be USB controller
-xlb@<addr> fsl,mpc5200-xlb XLB arbitrator
-
-fsl,mpc5200-gpt nodes
----------------------
-On the mpc5200 and 5200b, GPT0 has a watchdog timer function. If the board
-design supports the internal wdt, then the device node for GPT0 should
-include the empty property 'fsl,has-wdt'. Note that this does not activate
-the watchdog. The timer will function as a GPT if the timer api is used, and
-it will function as watchdog if the watchdog device is used. The watchdog
-mode has priority over the gpt mode, i.e. if the watchdog is activated, any
-gpt api call to this timer will fail with -EBUSY.
-
-If you add the property
- fsl,wdt-on-boot = <n>;
-GPT0 will be marked as in-use watchdog, i.e. blocking every gpt access to it.
-If n>0, the watchdog is started with a timeout of n seconds. If n=0, the
-configuration of the watchdog is not touched. This is useful in two cases:
-- just mark GPT0 as watchdog, blocking gpt accesses, and configure it later;
-- do not touch a configuration assigned by the boot loader which supervises
- the boot process itself.
-
-The watchdog will respect the CONFIG_WATCHDOG_NOWAYOUT option.
-
-An mpc5200-gpt can be used as a single line GPIO controller. To do so,
-add the following properties to the gpt node:
- gpio-controller;
- #gpio-cells = <2>;
-When referencing the GPIO line from another node, the first cell must always
-be zero and the second cell represents the gpio flags and described in the
-gpio device tree binding.
-
-An mpc5200-gpt can be used as a single line edge sensitive interrupt
-controller. To do so, add the following properties to the gpt node:
- interrupt-controller;
- #interrupt-cells = <1>;
-When referencing the IRQ line from another node, the cell represents the
-sense mode; 1 for edge rising, 2 for edge falling.
-
-fsl,mpc5200-psc nodes
----------------------
-The PSCs should include a cell-index which is the index of the PSC in
-hardware. cell-index is used to determine which shared SoC registers to
-use when setting up PSC clocking. cell-index number starts at '0'. ie:
- PSC1 has 'cell-index = <0>'
- PSC4 has 'cell-index = <3>'
-
-PSC in i2s mode: The mpc5200 and mpc5200b PSCs are not compatible when in
-i2s mode. An 'mpc5200b-psc-i2s' node cannot include 'mpc5200-psc-i2s' in the
-compatible field.
-
-
-fsl,mpc5200-gpio and fsl,mpc5200-gpio-wkup nodes
-------------------------------------------------
-Each GPIO controller node should have the empty property gpio-controller and
-#gpio-cells set to 2. First cell is the GPIO number which is interpreted
-according to the bit numbers in the GPIO control registers. The second cell
-is for flags which is currently unused.
-
-fsl,mpc5200-fec nodes
----------------------
-The FEC node can specify one of the following properties to configure
-the MII link:
-- fsl,7-wire-mode - An empty property that specifies the link uses 7-wire
- mode instead of MII
-- current-speed - Specifies that the MII should be configured for a fixed
- speed. This property should contain two cells. The
- first cell specifies the speed in Mbps and the second
- should be '0' for half duplex and '1' for full duplex
-- phy-handle - Contains a phandle to an Ethernet PHY.
-
-Interrupt controller (fsl,mpc5200-pic) node
--------------------------------------------
-The mpc5200 pic binding splits hardware IRQ numbers into two levels. The
-split reflects the layout of the PIC hardware itself, which groups
-interrupts into one of three groups; CRIT, MAIN or PERP. Also, the
-Bestcomm dma engine has it's own set of interrupt sources which are
-cascaded off of peripheral interrupt 0, which the driver interprets as a
-fourth group, SDMA.
-
-The interrupts property for device nodes using the mpc5200 pic consists
-of three cells; <L1 L2 level>
-
- L1 := [CRIT=0, MAIN=1, PERP=2, SDMA=3]
- L2 := interrupt number; directly mapped from the value in the
- "ICTL PerStat, MainStat, CritStat Encoded Register"
- level := [LEVEL_HIGH=0, EDGE_RISING=1, EDGE_FALLING=2, LEVEL_LOW=3]
-
-For external IRQs, use the following interrupt property values (how to
-specify external interrupts is a frequently asked question):
-External interrupts:
- external irq0: interrupts = <0 0 n>;
- external irq1: interrupts = <1 1 n>;
- external irq2: interrupts = <1 2 n>;
- external irq3: interrupts = <1 3 n>;
-'n' is sense (0: level high, 1: edge rising, 2: edge falling 3: level low)
-
-fsl,mpc5200-mscan nodes
------------------------
-See file can.txt in this directory.