linux-kernel - Re: [PATCH RFC 05/14] dt-bindings/interrupt-controller: pdc: add SPI config register

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Message-ID: <20190917215020.GA15853@codeaurora.org>
Date:   Tue, 17 Sep 2019 15:50:20 -0600
From:   Lina Iyer <ilina@...eaurora.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Rob Herring <robh@...nel.org>, evgreen@...omium.org,
        linus.walleij@...aro.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, bjorn.andersson@...aro.org,
        mkshah@...eaurora.org, linux-gpio@...r.kernel.org,
        rnayak@...eaurora.org, devicetree@...r.kernel.org, maz@...nel.org,
        sibis@...eaurora.org
Subject: Re: [PATCH RFC 05/14] dt-bindings/interrupt-controller: pdc: add SPI
 config register

Adding Sibi

On Fri, Sep 13 2019 at 13:53 -0600, Lina Iyer wrote:
>Sorry, I couldn't get to this earlier.
>
>On Thu, Sep 05 2019 at 18:03 -0600, Stephen Boyd wrote:
>>Quoting Lina Iyer (2019-09-03 10:07:22)
>>>On Mon, Sep 02 2019 at 07:58 -0600, Marc Zyngier wrote:
>>>>On 02/09/2019 14:38, Rob Herring wrote:
>>>>> On Thu, Aug 29, 2019 at 12:11:54PM -0600, Lina Iyer wrote:
>>>These are not GIC registers but located on the PDC interface to the GIC.
>>>They may or may not be secure access controlled, depending on the SoC.
>>>
>>
>>It looks like it falls under this "mailbox" device which is really the
>>catch all bucket for bits with no home besides they're related to the
>>apps CPUs/subsystem.
>>
>Thanks for pointing to this.
>>	apss_shared: mailbox@...90000 {
>>		compatible = "qcom,sdm845-apss-shared";
>>		reg = <0 0x17990000 0 0x1000>;
>But this doesn't seem correct. The registers in this page are all not
>mailbox door bell registers. We should restrict the space allocated to
>the mbox to 0xC or something, definitely, not the whole page. They all
>cannot be treated as a mailbox registers.
>>		#mbox-cells = <1>;
>>	};
>>
>>Can you point to this node with a phandle and then parse the reg
>>property out of it to use in the scm readl/writel APIs? Maybe it can be
>>a two cell property with <&apps_shared 0xf0> to indicate the offset to
>>the registers to read/write? In non-secure mode presumably we need to
>>also write these registers? Good news is that there's a regmap for this
>>driver already, so maybe that can be acquired from the pdc driver.
>>
>The register space collection seems to be mix of different types of
>application processor registers that should probably not be grouped up
>under one subsystem. A single regmap doesn't seem correct either.
>
>-- Lina