* HiSilicon SAS controller

The HiSilicon SAS controller supports SAS/SATA.

Main node required properties:
  - compatible : value should be as follows:
	(a) "hisilicon,hip05-sas-v1" for v1 hw in hip05 chipset
	(b) "hisilicon,hip06-sas-v2" for v2 hw in hip06 chipset
	(c) "hisilicon,hip07-sas-v2" for v2 hw in hip07 chipset
  - sas-addr : array of 8 bytes for host SAS address
  - reg : Address and length of the SAS register
  - hisilicon,sas-syscon: phandle of syscon used for sas control
  - ctrl-reset-reg : offset to controller reset register in ctrl reg
  - ctrl-reset-sts-reg : offset to controller reset status register in ctrl reg
  - ctrl-clock-ena-reg : offset to controller clock enable register in ctrl reg
  - queue-count : number of delivery and completion queues in the controller
  - phy-count : number of phys accessible by the controller
  - interrupts : For v1 hw: Interrupts for phys, completion queues, and fatal
		sources; the interrupts are ordered in 3 groups, as follows:
			- Phy interrupts
			- Completion queue interrupts
			- Fatal interrupts
		Phy interrupts : Each phy has 3 interrupt sources:
			- broadcast
			- phyup
			- abnormal
		The phy interrupts are ordered into groups of 3 per phy
		(broadcast, phyup, and abnormal) in increasing order.
		Completion queue interrupts : each completion queue has 1
			interrupt source.
			The interrupts are ordered in increasing order.
		Fatal interrupts : the fatal interrupts are ordered as follows:
			- ECC
			- AXI bus
		For v2 hw: Interrupts for phys, Sata, and completion queues;
		the interrupts are ordered in 3 groups, as follows:
			- Phy interrupts
			- Sata interrupts
			- Completion queue interrupts
		Phy interrupts : Each controller has 2 phy interrupts:
			- phy up/down
			- channel interrupt
		Sata interrupts : Each phy on the controller has 1 Sata
			interrupt. The interrupts are ordered in increasing
			order.
		Completion queue interrupts : each completion queue has 1
			interrupt source. The interrupts are ordered in
			increasing order.

Optional main node properties:
 - hip06-sas-v2-quirk-amt : when set, indicates that the v2 controller has the
			    "am-max-transmissions" limitation.
 - hisilicon,signal-attenuation : array of 3 32-bit values, containing de-emphasis,
		preshoot, and boost attenuation readings for the board. They
		are used to describe the signal attenuation of the board. These
		values' range is 7600 to 12400, and used to represent -24dB to
		24dB.
		The formula is "y = (x-10000)/10000". For example, 10478
		means 4.78dB.

Example:
	sas0: sas@c1000000 {
		compatible = "hisilicon,hip05-sas-v1";
		sas-addr = [50 01 88 20 16 00 00 0a];
		reg = <0x0 0xc1000000 0x0 0x10000>;
		hisilicon,sas-syscon = <&pcie_sas>;
		ctrl-reset-reg = <0xa60>;
		ctrl-reset-sts-reg = <0x5a30>;
		ctrl-clock-ena-reg = <0x338>;
		queue-count = <32>;
		phy-count = <8>;
		dma-coherent;
		interrupt-parent = <&mbigen_dsa>;
		interrupts =    <259 4>,<263 4>,<264 4>,/* phy0 */
				<269 4>,<273 4>,<274 4>,/* phy1 */
				<279 4>,<283 4>,<284 4>,/* phy2 */
				<289 4>,<293 4>,<294 4>,/* phy3 */
				<299 4>,<303 4>,<304 4>,/* phy4 */
				<309 4>,<313 4>,<314 4>,/* phy5 */
				<319 4>,<323 4>,<324 4>,/* phy6 */
				<329 4>,<333 4>,<334 4>,/* phy7 */
				<336 1>,<337 1>,<338 1>,/* cq0-2 */
				<339 1>,<340 1>,<341 1>,/* cq3-5 */
				<342 1>,<343 1>,<344 1>,/* cq6-8 */
				<345 1>,<346 1>,<347 1>,/* cq9-11 */
				<348 1>,<349 1>,<350 1>,/* cq12-14 */
				<351 1>,<352 1>,<353 1>,/* cq15-17 */
				<354 1>,<355 1>,<356 1>,/* cq18-20 */
				<357 1>,<358 1>,<359 1>,/* cq21-23 */
				<360 1>,<361 1>,<362 1>,/* cq24-26 */
				<363 1>,<364 1>,<365 1>,/* cq27-29 */
				<366 1>,<367 1>/* cq30-31 */
				<376 4>,/* fatal ecc */
				<381 4>;/* fatal axi */
	};
