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Date: Fri, 11 Mar 2022 03:59:57 +0000
From: Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To: Rob Herring <robh@...nel.org>
CC: "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
"catalin.marinas@....com" <catalin.marinas@....com>,
"will@...nel.org" <will@...nel.org>,
"andrew@...n.ch" <andrew@...n.ch>,
"gregory.clement@...tlin.com" <gregory.clement@...tlin.com>,
"sebastian.hesselbarth@...il.com" <sebastian.hesselbarth@...il.com>,
"kostap@...vell.com" <kostap@...vell.com>,
"robert.marko@...tura.hr" <robert.marko@...tura.hr>,
"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v1 1/4] dt-bindings: pinctrl: mvebu: Document bindings for
AC5
On 11/03/22 16:25, Chris Packham wrote:
>
> On 11/03/22 12:53, Chris Packham wrote:
>> Hi Rob,
>>
>> On 11/03/22 12:25, Rob Herring wrote:
>>> On Thu, Mar 10, 2022 at 04:00:36PM +1300, Chris Packham wrote:
>>>> Add JSON schema for marvell,ac5-pinctrl present on the Marvell
>>>> 98DX2530
>>>> SoC.
>>>>
>>>> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
>>>> ---
>>>> .../bindings/pinctrl/marvell,ac5-pinctrl.yaml | 73
>>>> +++++++++++++++++++
>>>> 1 file changed, 73 insertions(+)
>>>> create mode 100644
>>>> Documentation/devicetree/bindings/pinctrl/marvell,ac5-pinctrl.yaml
>>>>
>>>> diff --git
>>>> a/Documentation/devicetree/bindings/pinctrl/marvell,ac5-pinctrl.yaml
>>>> b/Documentation/devicetree/bindings/pinctrl/marvell,ac5-pinctrl.yaml
>>>> new file mode 100644
>>>> index 000000000000..c7ab3d0e8420
>>>> --- /dev/null
>>>> +++
>>>> b/Documentation/devicetree/bindings/pinctrl/marvell,ac5-pinctrl.yaml
>>>> @@ -0,0 +1,73 @@
>>>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
>>>> +%YAML 1.2
>>>> +---
>>>> +$id:
>>>> http://scanmail.trustwave.com/?c=20988&d=5Iiq4o6Dmr7xiwkJNrr25TNxYxK78lIUEWeJ-yq0UA&u=http%3a%2f%2fdevicetree%2eorg%2fschemas%2fpinctrl%2fmarvell%2cac5-pinctrl%2eyaml%23
>>>> +$schema:
>>>> http://scanmail.trustwave.com/?c=20988&d=5Iiq4o6Dmr7xiwkJNrr25TNxYxK78lIUEWPe_X2yXg&u=http%3a%2f%2fdevicetree%2eorg%2fmeta-schemas%2fcore%2eyaml%23
>>>> +
>>>> +title: Marvell AC5 pin controller
>>>> +
>>>> +maintainers:
>>>> + - Chris Packham <chris.packham@...iedtelesis.co.nz>
>>>> +
>>>> +description:
>>>> + Bindings for Marvell's AC5 memory-mapped pin controller.
>>>> +
>>>> +properties:
>>>> + compatible:
>>>> + items:
>>>> + - const: marvell,ac5-pinctrl
>>>> + - const: syscon
>>>> + - const: simple-mfd
>>> How is this a 'syscon' or 'simple-mfd' For syscon, what other
>>> functions/registers does it have? For simple-mfd, what other functions?
>>> You haven't defined them in the schema.
>>
>> It's in the vendor dts I have and it's likely there because
>> marvell,armada-37xx-pinctrl.txt has the same syscon and simple-mfd
>> compatibles. Looking at how this is used I think it's more like the
>> older mvebu pinctrl devices. I'll remove these two compatibles and
>> update the dtsi file.
> Actually turns out I do need the syscon compatible because the driver
> calls mvebu_pinctrl_simple_regmap_probe() which relies on the syscon
> compatible. I'm still not sure what to put in the binding doc other
> than "syscon" is needed because it is needed.
I think I get it now. I need a syscon node to be the parent of my
pinctrl node (and potentially others). That would also explain some
things I was confused about with the gpio controllers. It's just that
the vendor dts I've started with is woefully out of date w.r.t current
best practice.
>>
>>>
>>> blank line needed here.
>>>
>>>> + reg:
>>>> + maxItems: 1
>>>> +
>>>> +patternProperties:
>>>> + '-pins$':
>>>> + type: object
>>>> + $ref: pinmux-node.yaml#
>>>> +
>>>> + properties:
>>>> + marvell,function:
>>>> + $ref: "/schemas/types.yaml#/definitions/string"
>>>> + description:
>>>> + Indicates the function to select.
>>>> + enum: [ gpio, i2c0, i2c1, nand, sdio, spi0, spi1, uart0,
>>>> uart1, uart2, uart3 ]
>>>> +
>>>> + marvell,pins:
>>>> + $ref: /schemas/types.yaml#/definitions/string-array
>>>> + description:
>>>> + Array of MPP pins to be used for the given function.
>>>> + minItems: 1
>>>> + items:
>>>> + enum: [ mpp0, mpp1, mpp2, mpp3, mpp4, mpp5, mpp6, mpp7,
>>>> mpp8, mpp9,
>>>> + mpp10, mpp11, mpp12, mpp13, mpp14, mpp15, mpp16,
>>>> mpp17, mpp18, mpp19,
>>>> + mpp20, mpp21, mpp22, mpp23, mpp24, mpp25, mpp26,
>>>> mpp27, mpp28, mpp29,
>>>> + mpp30, mpp31, mpp32, mpp33, mpp34, mpp35, mpp36,
>>>> mpp37, mpp38, mpp39,
>>>> + mpp40, mpp41, mpp42, mpp43, mpp44, mpp45 ]
>>>> +
>>>> +allOf:
>>>> + - $ref: "pinctrl.yaml#"
>>>> +
>>>> +required:
>>>> + - compatible
>>>> + - reg
>>>> +
>>>> +additionalProperties: false
>>>> +
>>>> +examples:
>>>> + - |
>>>> + pinctrl@...20100 {
>>>> + compatible = "marvell,ac5-pinctrl",
>>>> + "syscon", "simple-mfd";
>>>> + reg = <0x80020100 0x20>;
>>>> +
>>>> + i2c0_pins: i2c0-pins {
>>>> + marvell,pins = "mpp26", "mpp27";
>>>> + marvell,function = "i2c0";
>>>> + };
>>>> +
>>>> + i2c0_gpio: i2c0-gpio-pins {
>>>> + marvell,pins = "mpp26", "mpp27";
>>>> + marvell,function = "gpio";
>>>> + };
>>>> + };
>>>> --
>>>> 2.35.1
>>>>
>>>>
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