linux-kernel - Re: [PATCH v2 4/5] soc: fsl: qe: Add support of IRQ in QE GPIO

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Message-ID: <20250818-angelfish-jasmine-f48d257a4949@spud>
Date: Mon, 18 Aug 2025 18:26:13 +0100
From: Conor Dooley <conor@...nel.org>
To: Christophe Leroy <christophe.leroy@...roup.eu>
Cc: Qiang Zhao <qiang.zhao@....com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-arm-kernel@...ts.infradead.org,
	linux-gpio@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 4/5] soc: fsl: qe: Add support of IRQ in QE GPIO

On Mon, Aug 18, 2025 at 07:08:47PM +0200, Christophe Leroy wrote:
> 
> 
> Le 18/08/2025 à 19:03, Conor Dooley a écrit :
> > On Mon, Aug 18, 2025 at 10:45:57AM +0200, Christophe Leroy wrote:
> > > In the QE, a few GPIOs are IRQ capable. Similarly to
> > > commit 726bd223105c ("powerpc/8xx: Adding support of IRQ in MPC8xx
> > > GPIO"), add IRQ support to QE GPIO.
> > > 
> > > Add property 'fsl,qe-gpio-irq-mask' similar to
> > > 'fsl,cpm1-gpio-irq-mask' that define which of the GPIOs have IRQs.
> > > 
> > > Here is an exemple for port B of mpc8323 which has IRQs for
> > > GPIOs PB7, PB9, PB25 and PB27.
> > > 
> > > 	qe_pio_b: gpio-controller@...8 {
> > > 		#gpio-cells = <2>;
> > > 		compatible = "fsl,mpc8323-qe-pario-bank";
> > > 		reg = <0x1418 0x18>;
> > > 		interrupts = <4 5 6 7>;
> > > 		fsl,qe-gpio-irq-mask = <0x01400050>;
> > > 		interrupt-parent = <&qepic>;
> > > 		gpio-controller;
> > > 	};
> > > 
> > > Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
> > > ---
> > > v2: Document fsl,qe-gpio-irq-mask
> > > ---
> > >   .../bindings/soc/fsl/cpm_qe/qe/par_io.txt     | 19 ++++++++++++++++++
> > >   drivers/soc/fsl/qe/gpio.c                     | 20 +++++++++++++++++++
> > >   2 files changed, 39 insertions(+)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/soc/fsl/cpm_qe/qe/par_io.txt b/Documentation/devicetree/bindings/soc/fsl/cpm_qe/qe/par_io.txt
> > > index 09b1b05fa677..9cd6e5ac2a7b 100644
> > > --- a/Documentation/devicetree/bindings/soc/fsl/cpm_qe/qe/par_io.txt
> > > +++ b/Documentation/devicetree/bindings/soc/fsl/cpm_qe/qe/par_io.txt
> > > @@ -32,6 +32,15 @@ Required properties:
> > >     "fsl,mpc8323-qe-pario-bank".
> > >   - reg : offset to the register set and its length.
> > >   - gpio-controller : node to identify gpio controllers.
> > > +Optional properties:
> > > +- fsl,qe-gpio-irq-mask : For banks having interrupt capability this item tells
> > > +  which ports have an associated interrupt (ports are listed in the same order
> > > +  QE ports registers)
> > > +- interrupts : This property provides the list of interrupt for each GPIO having
> > > +  one as described by the fsl,cpm1-gpio-irq-mask property. There should be as
> > > +  many interrupts as number of ones in the mask property. The first interrupt in
> > > +  the list corresponds to the most significant bit of the mask.
> > > +- interrupt-parent : Parent for the above interrupt property.
> > >   Example:
> > >   	qe_pio_a: gpio-controller@...0 {
> > > @@ -42,6 +51,16 @@ Example:
> > >   		gpio-controller;
> > >   	  };
> > > +	qe_pio_b: gpio-controller@...8 {
> > > +		#gpio-cells = <2>;
> > > +		compatible = "fsl,mpc8323-qe-pario-bank";
> > > +		reg = <0x1418 0x18>;
> > > +		interrupts = <4 5 6 7>;
> > > +		fsl,qe-gpio-irq-mask = <0x01400050>;
> > > +		interrupt-parent = <&qepic>;
> > > +		gpio-controller;
> > > +	  };
> > > +
> > >   	qe_pio_e: gpio-controller@...0 {
> > >   		#gpio-cells = <2>;
> > >   		compatible = "fsl,mpc8360-qe-pario-bank",
> > 
> > Why is there a binding change hiding in here alongside a driver one?
> 
> I did the same way as commit 726bd223105c ("powerpc/8xx: Adding support of
> IRQ in MPC8xx GPIO")
> 
> Should it be done differently ?

Yes, binding changes should not be in with driver changes. Surprised
that checkpatch didn't complain. That commit you mention seems to have
been like 10 years ago and without dt-binding maintainer review so not
the best thing to use as a basis.
Additionally, Rob may require you to covert to yaml to add new
properties, I forget if that is a requirement or not.

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