linux-kernel - Re: [RFC PATCH 0/1] dt-bindings: arm: Add scmi

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Message-ID: <2546477f-4190-e838-3095-f47b31802445@kernel.org>
Date:   Mon, 21 Feb 2022 22:01:43 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Oleksii Moisieiev <Oleksii_Moisieiev@...m.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>
Cc:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Cristian Marussi <cristian.marussi@....com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 0/1] dt-bindings: arm: Add scmi_devid paramter for

On 21/02/2022 18:26, Oleksii Moisieiev wrote:
> Introducing new parameter called scmi_devid to the device-tree bindings.
> This parameter should be set for the device nodes, which has
> clocks/power-domains/resets working through SCMI.
> Given parameter should set the device_id, needed to set device
> permissions in the Firmware. This feature will be extremely useful for
> the virtualized systems, which has more that one Guests running on the
> system at the same time or for the syestems, which require several
> agents with different permissions. Trusted agent will use scmi_devid to
> set the Device permissions for the Firmware (See Section 4.2.2.10 [0]
> for details).
> Agents concept is described in Section 4.2.1 [0].
> 
> scmi_devid in Device-tree node example:
> usb@...90000
> {
>     scmi_devid = <19>;
>     clocks = <&scmi_clock 3>, <&scmi_clock 2>;
>     resets = <&scmi_reset 10>, <&scmi_reset 9>;
>     power-domains = <&scmi_power 0>;
> };

And how do you prevent DT overlay adding such devid to any other node
thus allowing any other device to send requests with given devid?

Plus few technicalities:
1. Hyphen, not underscore in property name, so scmi-devid.
2. Your schema does is not selected by anything. How is it intended to
be used? Nothing is including it, either...

Best regards,
Krzysztof