Keystone Crypto Driver

This document explains the device tree bindings for the side-band Security
Accelerator on keystone devices.

Required properties:
 - compatible: should be "ti,netcp-sa-crypto".

 - clock: phandle to clksa clock.

 - clock-names: functional clock name. Should be set to "fck".

 - syscon-subsys: phandle to sa_config node, which represent registers common,
        for SA and HWRNG modules.

 - ti,navigator-dmas and ti,navigator-dma-names: Security accelerator uses
	2 dma channels. Rx and Tx. The first property is the pandle to the
	knav_dmas subsystem and flow for RX channel and channel number for
	TX channel. The second property is corresponding channel names.

 - ti,rx-channel: name of RX channel.

 - ti,rx-queue-depth: RX channel may use upto 4 free descriptor queue.
	rx-queue-depth describes number of buffers in each queue.

 - ti,rx-compl-queue: RX completion queue number.

 - ti,rx-pool: number of buffer descriptos and region for rx-pool.

 - ti,tx-channel: name of TX channel.

 - ti,tx-queue-depth: number of TX descriptos.

 - ti,tx-completion-queue: TX completion queue number.

 - ti,tx-pool: number of buffer descriptos and region for tx-pool.

 - ti,tx-submit-queue: submition queue number for TX channel.

 - ti,sc-id: range of security contex IDs available for driver


Example for K2HK:

sa_subsys: subsys@20c0000 {
	#address-cells = <1>;
	#size-cells = <1>;
	ranges = <0 0x20c0000 0x40000>;
	compatible = "simple-bus";

	sa_config: subsys {
		compatible = "syscon";
		reg = <0x0 0x100>;
	};

	crypto {
		compatible = "ti,netcp-sa-crypto";
		syscon-subsys = <&sa_config>;
		clocks = <&clksa>;
		clock-names = "fck";

		ti,navigator-dmas = <&dma_gbe 26>, <&dma_gbe 6>;
		ti,navigator-dma-names = "crypto-rx", "crypto-tx";

		ti,rx-channel = "crypto-rx";
		ti,rx-queue-depth = <256 64 0 0>;
		ti,rx-compl-queue = <8712>;
		ti,rx-pool	= <512 12>;

		ti,tx-channel = "crypto-tx";
		ti,tx-queue-depth = <256>;
		ti,tx-completion-queue = <8713>;
		ti,tx-pool = <512 12>;
		ti,tx-submit-queue = <646>;

		ti,sc-id = <0x7000 0x71ff>;
	};
};