On Tue, Aug 20, 2013 at 05:35:46PM +0100, Sebastian Andrzej Siewior wrote:
> The support for both am335x-USB instances required changes to the device
> tree bindings. This patch reflects these changes in the bindings
> document.
>
> v3…v4:
> - remove the child node for USB. This is driver specific on won't be
> reflected in the device tree
> - use the "mentor" prefix instead of "mg".
> - use "dr_mode" istead of "mg,port-mode" for the port mode. The former
> is used by a few other drivers.
>
> v2…v3:
> - use proper usb-phy nodes in evm, bone and evmsk device tree.
>
> v1…v2:
> - use mg prefix for the Metor Graphics specific attributes
> - use power in mA not in mA/2 as specifed in the USB2.0 specification
> - use usbX-phy instead of usbX_phy
> - use dma-controller instead of dma
>
> Cc: Rob Herring <rob.herring@xxxxxxxxxxx>
> Cc: Pawel Moll <pawel.moll@xxxxxxx>
> Cc: Mark Rutland <mark.rutland@xxxxxxx>
> Cc: Stephen Warren <swarren@xxxxxxxxxxxxx>
> Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
> Cc: devicetree@xxxxxxxxxxxxxxx
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
> ---
> .../devicetree/bindings/usb/am33xx-usb.txt | 222 ++++++++++++++++++---
> 1 file changed, 192 insertions(+), 30 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/usb/am33xx-usb.txt b/Documentation/devicetree/bindings/usb/am33xx-usb.txt
> index dc9dc8c..20c2ff2 100644
> --- a/Documentation/devicetree/bindings/usb/am33xx-usb.txt
> +++ b/Documentation/devicetree/bindings/usb/am33xx-usb.txt
> @@ -1,35 +1,197 @@
> -AM33XX MUSB GLUE
> - - compatible : Should be "ti,musb-am33xx"
> - - reg : offset and length of register sets, first usbss, then for musb instances
> - - interrupts : usbss, musb instance interrupts in order
> - - ti,hwmods : must be "usb_otg_hs"
> - - multipoint : Should be "1" indicating the musb controller supports
> - multipoint. This is a MUSB configuration-specific setting.
> - - num-eps : Specifies the number of endpoints. This is also a
> - MUSB configuration-specific setting. Should be set to "16"
> - - ram-bits : Specifies the ram address size. Should be set to "12"
> - - port0-mode : Should be "3" to represent OTG. "1" signifies HOST and "2"
> - represents PERIPHERAL.
> - - port1-mode : Should be "1" to represent HOST. "3" signifies OTG and "2"
> - represents PERIPHERAL.
> - - power : Should be "250". This signifies the controller can supply up to
> - 500mA when operating in host mode.
> + AM33xx MUSB
> +~~~~~~~~~~~~~~~
> +- compatible: ti,am33xx-usb
> +- reg: offset and length of the usbss register sets
> +- ti,hwmods : must be "usb_otg_hs"
> +
> +The glue layer contains multiple child nodes. It is required the have
> +at least a control module node, USB node and a PHY node. The second USB
> +node and its PHY node is optional. The DMA node is also optional.
> +
> +Reset module
> +~~~~~~~~~~~~
> +- compatible: ti,am335x-usb-ctrl-module
> +- reg: offset and length of the "USB control registers" in the "Control
> + Module" block. A second offset and length for the USB wake up control
> + in the same memory block.
> +- reg-names: "phy_ctrl" for the "USB control registers" and "wakeup" for
> + the USB wake up control register.
> +
> +USB PHY
> +~~~~~~~
> +compatible: ti,am335x-usb-phy
> +reg: offset and length of the "USB PHY" register space
> +ti,ctrl_mod: reference to the "reset module" node
> +reg-names: phy
For consistency, these should be bullet bpoints (as with the Reset
module properties above).
Also, preferably:
- reg-names: should contain "phy".
> +The PHY should have a "phy" alias numbered properly in the alias
> +node.
Why?
> +
> +USB
> +~~~
> +- compatible: ti,musb-am33xx
> +- reg: offset and length of "USB Controller Registers", and offset and
> + length of "USB Core" register space.
> +- reg-names: control for the ""USB Controller Registers" and "mc" for
> + "USB Core" register space
Consistent quoting please.
> +- interrupts: USB interrupt number
- interrupts: should contain an interrupt-specifier for the USB
interrupt.
Is this the only interrupt? Is there a particular name for it in any
data sheet?
> +- interrupt-names: mc
String property values quoted please:
- interrupt-names: should contain "mc" for the USB interrupt.
Is "mc" the name of the interrupt on the data sheet?
> +- dr_mode: Should be one of "host", "peripheral" or "otg".
> +- mentor,multipoint: Should be "1" indicating the musb controller supports
> + multipoint. This is a MUSB configuration-specific setting.
Is this a boolean value?
Why is this not an empty property?
> +- mentor,num-eps: Specifies the number of endpoints. This is also a
> + MUSB configuration-specific setting. Should be set to "16"
> +- mentor,ram-bits: Specifies the ram address size. Should be set to "12"
Is this to define the address space the controller can see? What if it's
offset from the CPU's view? This sounds like something better described
via another means (like dma-ranges).
> +- mentor,power: Should be "500". This signifies the controller can supply up to
> + 500mA when operating in host mode.
Why do we nee a particular value in a binding-specific property?
> +- phys: reference to the USB phy
> +- dmas: specifies the dma channels
Please refer to the bindings for these.
> +- dma-names: specifies the names of the channels. Use "rxN" for receive
> + and "txN" for transmit endpoints. N specifies the endpoint number.
> +
> +The controller should have an "usb" alias numbered properly in the alias
> +node.
Why?
> +
> +DMA
> +~~~
> +- compatible: ti,am3359-cppi41
> +- reg: offset and length of the following register spaces: USBSS, USB
> + CPPI DMA Controller, USB CPPI DMA Scheduler, USB Queue Manager
> +- reg-names: glue, controller, scheduler, queuemgr
Are these expected to be in the order described in reg, or in any order
and should be looked up via reg-names?
> +- #dma-cells: should be set to 2. The first number represents the
> + endpoint number (0 … 14 for endpoints 1 … 15 on instance 0 and 15 … 29
> + for endpoints 1 … 15 on instance 1). The second number is 0 for RX and
> + 1 for TX transfers.
Any reason for describing that one-off?
> +- #dma-channels: should be set to 30 representing the 15 endpoints for
> + each USB instance.
>
> Example:
> +~~~~~~~~
> +The following example contains all the nodes as used on am335x-evm:
> +
> +aliases {
> + usb0 = &usb0;
> + usb1 = &usb1;
> + phy0 = &usb0_phy;
> + phy1 = &usb1_phy;
> +};
>
> -usb@47400000 {
> - compatible = "ti,musb-am33xx";
> - reg = <0x47400000 0x1000 /* usbss */
> - 0x47401000 0x800 /* musb instance 0 */
> - 0x47401800 0x800>; /* musb instance 1 */
> - interrupts = <17 /* usbss */
> - 18 /* musb instance 0 */
> - 19>; /* musb instance 1 */
> - multipoint = <1>;
> - num-eps = <16>;
> - ram-bits = <12>;
> - port0-mode = <3>;
> - port1-mode = <3>;
> - power = <250>;
> +usb: usb@47400000 {
> + compatible = "ti,am33xx-usb";
> + reg = <0x47400000 0x1000>;
> + ranges;
> + #address-cells = <1>;
> + #size-cells = <1>;
> ti,hwmods = "usb_otg_hs";
> +
> + ctrl_mod: control@44e10000 {
> + compatible = "ti,am335x-usb-ctrl-module";
> + reg = <0x44e10620 0x10
> + 0x44e10648 0x4>;
Nit: could you bracket these independently please? Like this:
reg = <0x44e10620 0x10>,
<0x44e10648 0x4>;
Similarly for other composite values in lists.
Cheers,
Mark.
> + reg-names = "phy_ctrl", "wakeup";
> + };
> +
> + usb0_phy: usb-phy@47401300 {
> + compatible = "ti,am335x-usb-phy";
> + reg = <0x47401300 0x100>;
> + reg-names = "phy";
> + ti,ctrl_mod = <&ctrl_mod>;
> + };
> +
> + usb0: usb@47401000 {
> + compatible = "ti,musb-am33xx";
> + reg = <0x47401400 0x400
> + 0x47401000 0x200>;
> + reg-names = "mc", "control";
> +
> + interrupts = <18>;
> + interrupt-names = "mc";
> + dr_mode = "otg"
> + mentor,multipoint = <1>;
> + mentor,num-eps = <16>;
> + mentor,ram-bits = <12>;
> + mentor,power = <500>;
> + phys = <&usb0_phy>;
> +
> + dmas = <&cppi41dma 0 0 &cppi41dma 1 0
> + &cppi41dma 2 0 &cppi41dma 3 0
> + &cppi41dma 4 0 &cppi41dma 5 0
> + &cppi41dma 6 0 &cppi41dma 7 0
> + &cppi41dma 8 0 &cppi41dma 9 0
> + &cppi41dma 10 0 &cppi41dma 11 0
> + &cppi41dma 12 0 &cppi41dma 13 0
> + &cppi41dma 14 0 &cppi41dma 0 1
> + &cppi41dma 1 1 &cppi41dma 2 1
> + &cppi41dma 3 1 &cppi41dma 4 1
> + &cppi41dma 5 1 &cppi41dma 6 1
> + &cppi41dma 7 1 &cppi41dma 8 1
> + &cppi41dma 9 1 &cppi41dma 10 1
> + &cppi41dma 11 1 &cppi41dma 12 1
> + &cppi41dma 13 1 &cppi41dma 14 1>;
> + dma-names =
> + "rx1", "rx2", "rx3", "rx4", "rx5", "rx6", "rx7",
> + "rx8", "rx9", "rx10", "rx11", "rx12", "rx13",
> + "rx14", "rx15",
> + "tx1", "tx2", "tx3", "tx4", "tx5", "tx6", "tx7",
> + "tx8", "tx9", "tx10", "tx11", "tx12", "tx13",
> + "tx14", "tx15";
> + };
> +
> + usb1_phy: usb-phy@47401b00 {
> + compatible = "ti,am335x-usb-phy";
> + reg = <0x47401b00 0x100>;
> + reg-names = "phy";
> + ti,ctrl_mod = <&ctrl_mod>;
> + };
> +
> + usb1: usb@47401800 {
> + compatible = "ti,musb-am33xx";
> + reg = <0x47401c00 0x400
> + 0x47401800 0x200>;
> + reg-names = "mc", "control";
> + interrupts = <19>;
> + interrupt-names = "mc";
> + dr_mode = "host"
> + mentor,multipoint = <1>;
> + mentor,num-eps = <16>;
> + mentor,ram-bits = <12>;
> + mentor,power = <500>;
> + phys = <&usb1_phy>;
> +
> + dmas = <&cppi41dma 15 0 &cppi41dma 16 0
> + &cppi41dma 17 0 &cppi41dma 18 0
> + &cppi41dma 19 0 &cppi41dma 20 0
> + &cppi41dma 21 0 &cppi41dma 22 0
> + &cppi41dma 23 0 &cppi41dma 24 0
> + &cppi41dma 25 0 &cppi41dma 26 0
> + &cppi41dma 27 0 &cppi41dma 28 0
> + &cppi41dma 29 0 &cppi41dma 15 1
> + &cppi41dma 16 1 &cppi41dma 17 1
> + &cppi41dma 18 1 &cppi41dma 19 1
> + &cppi41dma 20 1 &cppi41dma 21 1
> + &cppi41dma 22 1 &cppi41dma 23 1
> + &cppi41dma 24 1 &cppi41dma 25 1
> + &cppi41dma 26 1 &cppi41dma 27 1
> + &cppi41dma 28 1 &cppi41dma 29 1>;
> + dma-names =
> + "rx1", "rx2", "rx3", "rx4", "rx5", "rx6", "rx7",
> + "rx8", "rx9", "rx10", "rx11", "rx12", "rx13",
> + "rx14", "rx15",
> + "tx1", "tx2", "tx3", "tx4", "tx5", "tx6", "tx7",
> + "tx8", "tx9", "tx10", "tx11", "tx12", "tx13",
> + "tx14", "tx15";
> + };
> +
> + cppi41dma: dma-controller@07402000 {
> + compatible = "ti,am3359-cppi41";
> + reg = <0x47400000 0x1000
> + 0x47402000 0x1000
> + 0x47403000 0x1000
> + 0x47404000 0x4000>;
> + reg-names = "glue", "controller", "scheduler", "queuemgr";
> + interrupts = <17>;
> + interrupt-names = "glue";
> + #dma-cells = <2>;
> + #dma-channels = <30>;
> + #dma-requests = <256>;
> + };
> };
> --
> 1.8.4.rc2
>
>
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