linux-kernel - Re: [Patch v4 1/8] dt/bindings: firmware: Add Qualcomm SCM binding

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Message-ID: <20160511194905.GU1256@tuxbot>
Date:	Wed, 11 May 2016 12:49:05 -0700
From:	Bjorn Andersson <bjorn.andersson@...aro.org>
To:	Andy Gross <andy.gross@...aro.org>
Cc:	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Stephen Boyd <sboyd@...eaurora.org>,
	jilai wang <jilaiw@...eaurora.org>
Subject: Re: [Patch v4 1/8] dt/bindings: firmware: Add Qualcomm SCM binding

On Wed 11 May 07:15 PDT 2016, Andy Gross wrote:

> This patch adds the device tree support for the Qualcomm SCM firmware.
> 
> Signed-off-by: Andy Gross <andy.gross@...aro.org>
> ---
>  .../devicetree/bindings/firmware/qcom,scm.txt      | 28 ++++++++++++++++++++++
>  1 file changed, 28 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/firmware/qcom,scm.txt
> 
> diff --git a/Documentation/devicetree/bindings/firmware/qcom,scm.txt b/Documentation/devicetree/bindings/firmware/qcom,scm.txt
> new file mode 100644
> index 0000000..0c5f1ff
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/firmware/qcom,scm.txt
> @@ -0,0 +1,28 @@
> +QCOM Secure Channel Manager (SCM)
> +
> +Qualcomm processors include an interface to communicate to the secure firmware.
> +This interface allows for clients to request different types of actions.  These
> +can include CPU power up/down, HDCP requests, loading of firmware, and other
> +assorted actions.
> +
> +Required properties:
> +- compatible: must contain one of the following:
> + * "qcom,scm-apq8064" for APQ8064 platforms
> + * "qcom,scm-msm8660" for MSM8660 platforms
> + * "qcom,scm-msm8690" for MSM8690 platforms
> + * "qcom,scm" for later processors (MSM8916, APQ8084, MSM8974, etc)
> +- clocks: One to three clocks may be required based on compatible.
> + * Only core clock required for "qcom,scm-apq8084", "qcom,scm-msm8660", and "qcom,scm-msm8960"
> + * Core, iface, and bus clocks required for "qcom,scm"
> +- clock-names: Must contain "core" for the core clock, "iface" for the interface
> +  clock and "bus" for the bus clock per the requirements of the compatible.

I like this split of generic binding and the special cases, gives the
wanted clarity for the outliers without the added churn in the common
case.

Acked-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn