linux-kernel - Re: [PATCH v2 02/32] devicetree: bindings: scsi: HiSi SAS

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Date:	Mon, 26 Oct 2015 14:45:23 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	John Garry <john.garry@...wei.com>
Cc:	JBottomley@...n.com, robh+dt@...nel.org, pawel.moll@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org, arnd@...db.de,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linuxarm@...wei.com,
	john.garry2@...l.dcu.ie, hare@...e.de, xuwei5@...ilicon.com,
	zhangfei.gao@...aro.org
Subject: Re: [PATCH v2 02/32] devicetree: bindings: scsi: HiSi SAS

On Mon, Oct 26, 2015 at 10:14:33PM +0800, John Garry wrote:
> Add devicetree bindings for HiSilicon SAS driver.
> 
> Signed-off-by: John Garry <john.garry@...wei.com>
> ---
>  .../devicetree/bindings/scsi/hisilicon-sas.txt     | 70 ++++++++++++++++++++++
>  1 file changed, 70 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/scsi/hisilicon-sas.txt
> 
> diff --git a/Documentation/devicetree/bindings/scsi/hisilicon-sas.txt b/Documentation/devicetree/bindings/scsi/hisilicon-sas.txt
> new file mode 100644
> index 0000000..d1e7b2a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/scsi/hisilicon-sas.txt
> @@ -0,0 +1,70 @@
> +* HiSilicon SAS controller
> +
> +The HiSilicon SAS controller supports SAS/SATA.
> +
> +Main node required properties:
> +  - compatible : value should be as follows:
> +	(a) "hisilicon,sas-controller-v1" for v1 of HiSilicon SAS controller IP
> +  - reg : Address and length of the SAS register
> +  - hisilicon,sas-syscon: phandle of syscon used for sas control
> +  - ctrl-reg : offset to the following SAS control registers (in order):
> +		- reset assert
> +		- clock disable
> +		- reset status
> +		- reset de-assert
> +		- clock enable

This needs a better name, and it should probably be split up into
several properties.

However, it sounds like the syscon is actually a clock+reset
controller, and should be modelled as such. It's not actually a part of
the SAS controller as such.

> +  - queue-count : number of delivery and completion queues in the controller
> +  - phy-count : number of phys accessible by the controller
> +  - interrupts : Interrupts for phys, completion queues, and fatal
> +		 interrupts:
> +		  - Each phy has 3 interrupt sources:
> +			- broadcast
> +			- phyup
> +			- abnormal
> +		  - Each completion queue has 1 interrupt source
> +		  - Each controller has 2 fatal interrupt sources:
> +			- ECC
> +			- AXI bus

Please make the ordering explicit here (you might only need to add the
phrase "in order" in a few places).

Thanks,
Mark.

> +
> +* HiSilicon SAS syscon
> +
> +Required properties:
> +- compatible: should be "hisilicon,sas-ctrl", "syscon"
> +- reg: offset and length of the syscon sas-ctrl registers
> +
> +
> +Example:
> +	sas_ctrl0: sas_ctrl@...00000 {
> +		compatible = "hisilicon,sas-ctrl", "syscon";
> +		reg = <0x0 0xc0000000 0x0 0x10000>;
> +	};
> +
> +	sas0: sas@...00000 {
> +		compatible = "hisilicon,sas-controller-v1";
> +		reg = <0x0 0xc1000000 0x0 0x10000>;
> +		hisilicon,sas-syscon = <&sas_ctrl0>;
> +		ctrl-reg = <0xa60 0x33c 0x5a30 0xa64 0x338>;
> +		queue-count = <32>;
> +		phy-count = <8>;
> +		dma-coherent;
> +		interrupt-parent = <&mbigen_dsa>;
> +		interrupts = <259 4>, <263 4>,<264 4>,/* phy irq(0~79) */
> +				<269 4>,<273 4>,<274 4>,/* phy irq(0~79) */
> +				<279 4>,<283 4>,<284 4>,/* phy irq(0~79) */
> +				<289 4>,<293 4>,<294 4>,/* phy irq(0~79) */
> +				<299 4>,<303 4>,<304 4>,/* phy irq(0~79) */
> +				<309 4>,<313 4>,<314 4>,/* phy irq(0~79) */
> +				<319 4>,<323 4>,<324 4>,/* phy irq(0~79) */
> +				<329 4>,<333 4>,<334 4>,/* phy irq(0~79) */
> +				<336 1>,<337 1>,<338 1>,<339 1>,<340 1>,
> +				<341 1>,<342 1>,<343 1>,/* cq irq (80~111) */
> +				<344 1>,<345 1>,<346 1>,<347 1>,<348 1>,
> +				<349 1>,<350 1>,<351 1>,/* cq irq (80~111) */
> +				<352 1>,<353 1>,<354 1>,<355 1>,<356 1>,
> +				<357 1>,<358 1>,<359 1>,/* cq irq (80~111) */
> +				<360 1>,<361 1>,<362 1>,<363 1>,<364 1>,
> +				<365 1>,<366 1>,<367 1>,/* cq irq (80~111) */
> +				<376 4>,/* chip fatal error irq(120) */
> +				<381 4>;/* chip fatal error irq(125) */
> +		status = "disabled";
> +	};
> -- 
> 1.9.1
> 
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