linux-kernel - Re: [PATCH v2 4/5] dt-bindings: phy-rockchip-inno-usb2: add otg mux irq quirk

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Date:   Wed, 02 Aug 2017 13:25:55 +0200
From:   Heiko Stübner <heiko@...ech.de>
To:     Frank Wang <frank.wang@...k-chips.com>
Cc:     kishon@...com, robh+dt@...nel.org, mark.rutland@....com,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, huangtao@...k-chips.com,
        william.wu@...k-chips.com, daniel.meng@...k-chips.com,
        kever.yang@...k-chips.com, andy.yan@...k-chips.com,
        wmc@...k-chips.com
Subject: Re: [PATCH v2 4/5] dt-bindings: phy-rockchip-inno-usb2: add otg mux irq quirk

Hi Frank,

Am Mittwoch, 2. August 2017, 15:53:09 CEST schrieb Frank Wang:
> Add rockchip,otg_mux_irq_quirk property to support the otg-id/
> otg-bvalid/linestate irqs that are multiplexed to one irq in
> otg-port on some special Rockchip SoCs (e.g RV1108).
> 
> Signed-off-by: Frank Wang <frank.wang@...k-chips.com>
> ---
>  Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.txt | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git
> a/Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.txt
> b/Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.txt index
> ddf868a..d49572b 100644
> --- a/Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.txt
> +++ b/Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.txt
> @@ -22,6 +22,8 @@ Optional properties:
>  		 register files".
>   - rockchip,companion_grf_quirk : when set driver will request
>  		 "rockchip,usbgrf" phandle as one companion-grf.
> + - rockchip,otg_mux_irq_quirk: set if otg-id/otg-bvalid/linestate irqs
> +		 are multiplexed to one irq in otg-port on some SoCs.
> 
>  Required nodes : a sub-node is required for each port the phy provides.
>  		 The sub-node name is used to identify host or otg port,
> @@ -36,6 +38,9 @@ Required properties (port (child) node):
>  	* "otg-id" : for the otg id interrupt.
>  	* "otg-bvalid" : for the otg vbus interrupt.
>  	* "linestate" : for the host/otg linestate interrupt.
> +	* "otg-mux" : otg-port interrupt, which multiplex otg-id/otg-bvalid/
> +		linestate irqs to one irq. Should specify if
> +		rockchip,otg_mux_irq_quirk property is set.

I'd think that should be auto-detectable in the driver without the quirk 
property above?

I.e. check for the otg-mux interrupt first on probe and if can be found, you 
know that this is the case, otherwise look for the regular interrupts.


Also I would write that down a bit differently, so that it doesn't confuse 
people. Something similar to:

 - interrupt-names : a list which should
+    Regular case:
	* "otg-id" : for the otg id interrupt.
	* "otg-bvalid" : for the otg vbus interrupt.
	* "linestate" : for the host/otg linestate interrupt.
+    Some socs use one interrupt with the obove muxed together, so for these
+	* "otg-mux" : otg-port interrupt, which multiplex otg-id/otg-bvalid/
+		linestate irqs to one irq.


Heiko