linux-kernel - Re: [PATCH v3 4/9] dt-bindings: soc: mobileye: add EyeQ OLB system controller

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Date: Mon, 24 Jun 2024 14:56:59 -0600
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Théo Lebrun <theo.lebrun@...tlin.com>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Stephen Boyd <sboyd@...nel.org>,
	Michael Turquette <mturquette@...libre.com>,
	linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
	Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>,
	linux-gpio@...r.kernel.org,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	linux-clk@...r.kernel.org, "Rafael J. Wysocki" <rafael@...nel.org>,
	Tawfik Bayouk <tawfik.bayouk@...ileye.com>,
	Lee Jones <lee@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devicetree@...r.kernel.org, Philipp Zabel <p.zabel@...gutronix.de>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Gregory CLEMENT <gregory.clement@...tlin.com>
Subject: Re: [PATCH v3 4/9] dt-bindings: soc: mobileye: add EyeQ OLB system
 controller


On Thu, 20 Jun 2024 19:30:56 +0200, Théo Lebrun wrote:
> Add documentation to describe the "Other Logic Block" system-controller.
> It deals with three platforms: EyeQ5, EyeQ6L and EyeQ6H. First two have
> a single instance, whereas EyeQ6H has seven named instances.
> 
> Features provided are:
>  - Clocks, children to main crystal. Some PLLs and divider clocks.
>  - Resets. Some instances DO NOT have reset.
>  - Pinctrl. Only EyeQ5 has such feature.
> 
> Those are NOT the only features exposed in OLB system-controllers! Many
> individual registers, related to IP block integration, can be found.
> Additional features will be exposed over time.
> 
> We simplify devicetree phandles to OLB in two ways:
> 
>  - Compatibles exposing a single clock do not ask for a index argument.
>    This means we use EyeQ6H OLB south (it has four clocks):
> 
>       clocks = <&olb_south EQ6HC_SOUTH_PLL_PER>;
> 
>    But use EyeQ6H OLB east (it has one clock):
> 
>       clocks = <&olb_east>;
> 
>  - Compatibles exposing a single reset domain do not ask for a domain
>    index, only a reset index.
>    This means we use EyeQ5 OLB (it has three domains):
> 
>      resets = <&olb 0 10>;
> 
>    But use EyeQ6H west reset (it has one domain):
> 
>       resets = <&olb_west 3>;
> 
> About pinctrl subnodes: all pins have two functionality, either GPIO or
> something-else. The latter is pin dependent, we express constraints
> using many if-then.
> 
> Signed-off-by: Théo Lebrun <theo.lebrun@...tlin.com>
> ---
>  .../bindings/soc/mobileye/mobileye,eyeq5-olb.yaml  | 374 +++++++++++++++++++++
>  MAINTAINERS                                        |   2 +
>  include/dt-bindings/clock/mobileye,eyeq5-clk.h     |  21 ++
>  3 files changed, 397 insertions(+)
> 

Reviewed-by: Rob Herring (Arm) <robh@...nel.org>