Hi Bjorn,
On 09/29/2014 07:34 PM, Bjorn Andersson wrote:
> Add device tree binding documentation for the Qualcom Shared Memory
> manager.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxxxxxx>
> ---
>
> Exposed by this node is a set of items of different sizes. For many things a
> standard of_xlate method of referencing the individual nodes would be
> preferable, so a #something-cells would make sense. We do however also needs
> access to these items without explicitly stating the references in devicetree
> (e.g. SMD references 257 of these). I haven't found any good example of how to
> implement this, so suggestions are welcome.
>
> Note that the hwspinlock reference is not yet supported in the mainline, but
> this will likely need a few iterations so I wanted to get this out.
>
> .../devicetree/bindings/soc/qcom/qcom,smem.txt | 34 ++++++++++++++++++++
> 1 file changed, 34 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,smem.txt
>
> diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,smem.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,smem.txt
> new file mode 100644
> index 0000000..ddd58c7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,smem.txt
> @@ -0,0 +1,34 @@
> +Qualcomm Shared Memory binding
> +
> +This binding describes the Qualcomm Shared Memory, used to share data between
> +various subsystems and OSes in Qualcomm platforms.
> +
> +- compatible:
> + Usage: required
> + Value type: <stringlist>
> + Definition: must be:
> + "qcom,smem"
> +
> +- reg:
> + Usage: required
> + Value type: <prop-encoded-array>
> + Definition: base address and size pair for each area representing the
> + shared memory. The first pair will must represent the "main"
> + area, where the shared memory header and table-of-content
> + can be found.
> +
> +- hwspinlocks:
The property name to use should be "hwlocks" and not "hwspinlocks". This
is what the hwspinlock driver core expects from client users.
regards
Suman
> + Usage: required
> + Value type: <prop-encoded-array>
> + Definition: reference to a hwspinlock used to protect allocations from
> + the shared memory
> +
> += EXAMPLE
> +
> + smem: smem@fa00000 {
> + compatible = "qcom,smem";
> + reg = <0x0fa00000 0x200000>,
> + <0xfc428000 0x4000>;
> +
> + hwspinlocks = <&tcsr_mutex 3>;
> + };
>
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