linux-kernel - Re: [PATCH v3 02/12] dt-bindings: pinctrl: Add RaspberryPi RP1 gpio/pinctrl/pinmux bindings

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Message-ID: <6866a4d4-3ef1-4e87-a69e-bb9efce1a071@kernel.org>
Date: Thu, 7 Nov 2024 12:57:29 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Andrea della Porta <andrea.porta@...e.com>
Cc: Michael Turquette <mturquette@...libre.com>,
 Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Florian Fainelli <florian.fainelli@...adcom.com>,
 Broadcom internal kernel review list
 <bcm-kernel-feedback-list@...adcom.com>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>,
 Krzysztof Wilczynski <kw@...ux.com>,
 Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
 Bjorn Helgaas <bhelgaas@...gle.com>, Linus Walleij
 <linus.walleij@...aro.org>, Catalin Marinas <catalin.marinas@....com>,
 Will Deacon <will@...nel.org>, Bartosz Golaszewski <brgl@...ev.pl>,
 Derek Kiernan <derek.kiernan@....com>, Dragan Cvetic
 <dragan.cvetic@....com>, Arnd Bergmann <arnd@...db.de>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Saravana Kannan <saravanak@...gle.com>, linux-clk@...r.kernel.org,
 devicetree@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-pci@...r.kernel.org, linux-gpio@...r.kernel.org,
 Masahiro Yamada <masahiroy@...nel.org>, Stefan Wahren <wahrenst@....net>,
 Herve Codina <herve.codina@...tlin.com>,
 Luca Ceresoli <luca.ceresoli@...tlin.com>,
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH v3 02/12] dt-bindings: pinctrl: Add RaspberryPi RP1
 gpio/pinctrl/pinmux bindings

On 04/11/2024 12:11, Andrea della Porta wrote:

>>>>
>>>> Your example does not use any subnodes, so this looks not needed.
>>>
>>> The example has subnodes, as in the following excerpt from the example:
>>
>> I meant, you do not need properties in subnodes (1st level). You only
>> want properties in subnodes of subnodes, so 2nd level. What is the point
>> of allowing them in 1st level?
> 
> I will add those two sub-nodes to the example:
> 
>             rp1-i2s0-default-state {
>                 function = "i2s0";
>                 pins = "gpio18", "gpio19", "gpio20", "gpio21";
>                 bias-disable;
>             };
> 
>             rp1-uart0-default-state {
>                 txd-pins {
>                     function = "uart0";
>                     pins = "gpio14";
>                     bias-disable;
>                 };
> 
>                 rxd-pins {
>                     function = "uart0";
>                     pins = "gpio15";
>                     bias-pull-up;
>                 };
>             };
> 
> The first is just a group of pins with the same settings, the second is 
> a pin group with different settings per pin. This is basically the same
> usage as in qcom,sm4250-lpass-lpi-pinctrl.yaml.
> 

Ack, that's ok then.

Best regards,
Krzysztof