Re: [PATCH V2 01/10] Documentation: dt-bindings: mailbox: tegra: Add binding for HSP mailbox

[Sivaram Nair]

On Tue, Jul 05, 2016 at 05:04:22PM +0800, Joseph Lo wrote:
> Add DT binding for the Hardware Synchronization Primitives (HSP). The
> HSP is designed for the processors to share resources and communicate
> together. It provides a set of hardware synchronization primitives for
> interprocessor communication. So the interprocessor communication (IPC)
> protocols can use hardware synchronization primitive, when operating
> between two processors not in an SMP relationship.
> 
> Signed-off-by: Joseph Lo <josephl@xxxxxxxxxx>
> ---
> Changes in V2:
> - revise the compatible string, interrupt-names, interrupts, and #mbox-cells
>   properties
> - remove "nvidia,hsp-function" property
> - fix the header file name
> - the binding supports the concept of multiple HSP sub-modules on one HSP HW
>   block now.
> ---
>  .../bindings/mailbox/nvidia,tegra186-hsp.txt       | 51 ++++++++++++++++++++++
>  include/dt-bindings/mailbox/tegra186-hsp.h         | 23 ++++++++++
>  2 files changed, 74 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mailbox/nvidia,tegra186-hsp.txt
>  create mode 100644 include/dt-bindings/mailbox/tegra186-hsp.h
> 
> diff --git a/Documentation/devicetree/bindings/mailbox/nvidia,tegra186-hsp.txt b/Documentation/devicetree/bindings/mailbox/nvidia,tegra186-hsp.txt
> new file mode 100644
> index 000000000000..10e53edbe1c7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mailbox/nvidia,tegra186-hsp.txt
> @@ -0,0 +1,51 @@
> +NVIDIA Tegra Hardware Synchronization Primitives (HSP)
> +
> +The HSP modules are used for the processors to share resources and communicate
> +together. It provides a set of hardware synchronization primitives for
> +interprocessor communication. So the interprocessor communication (IPC)
> +protocols can use hardware synchronization primitives, when operating between
> +two processors not in an SMP relationship.
> +
> +The features that HSP supported are shared mailboxes, shared semaphores,
> +arbitrated semaphores and doorbells.
> +
> +Required properties:
> +- name : Should be hsp
> +- compatible
> +    Array of strings.
> +    one of:
> +    - "nvidia,tegra186-hsp"
> +- reg : Offset and length of the register set for the device.
> +- interrupt-names
> +    Array of strings.
> +    Contains a list of names for the interrupts described by the interrupt
> +    property. May contain the following entries, in any order:
> +    - "doorbell"
> +    Users of this binding MUST look up entries in the interrupt property
> +    by name, using this interrupt-names property to do so.
> +- interrupts
> +    Array of interrupt specifiers.
> +    Must contain one entry per entry in the interrupt-names property,
> +    in a matching order.
> +- #mbox-cells : Should be 1.
> +
> +The mbox specifier of the "mboxes" property in the client node should use
> +the "HSP_MBOX_ID" macro which integrates the HSP type and master ID data.
> +Those information can be found in the following file.
> +
> +- <dt-bindings/mailbox/tegra186-hsp.h>.
> +
> +Example:
> +
> +hsp_top0: hsp@3c00000 {
> +	compatible = "nvidia,tegra186-hsp";
> +	reg = <0x0 0x03c00000 0x0 0xa0000>;
> +	interrupts = <GIC_SPI 176 IRQ_TYPE_LEVEL_HIGH>;
> +	interrupt-names = "doorbell";
> +	#mbox-cells = <1>;
> +};
> +
> +client {
> +	...
> +	mboxes = <&hsp_top0 HSP_MBOX_ID(DB, HSP_DB_MASTER_XXX)>;
> +};
> diff --git a/include/dt-bindings/mailbox/tegra186-hsp.h b/include/dt-bindings/mailbox/tegra186-hsp.h
> new file mode 100644
> index 000000000000..365dbeb5d894
> --- /dev/null
> +++ b/include/dt-bindings/mailbox/tegra186-hsp.h
> @@ -0,0 +1,23 @@
> +/*
> + * This header provides constants for binding nvidia,tegra186-hsp.
> + *
> + * The number with HSP_DB_MASTER prefix indicates the bit that is
> + * associated with a master ID in the doorbell registers.
> + */
> +
> +
> +#ifndef _DT_BINDINGS_MAILBOX_TEGRA186_HSP_H
> +#define _DT_BINDINGS_MAILBOX_TEGRA186_HSP_H
> +
> +#define HSP_MBOX_TYPE_DB 0x0
> +#define HSP_MBOX_TYPE_SM 0x1
> +#define HSP_MBOX_TYPE_SS 0x2
> +#define HSP_MBOX_TYPE_AS 0x3
> +
> +#define HSP_DB_MASTER_CCPLEX 17
> +#define HSP_DB_MASTER_BPMP 19
> +
> +#define HSP_MBOX_ID(type, ID) \
> +		(HSP_MBOX_TYPE_##type << 16 | ID)

It will be nicer if you avoid the macro glue magic '##' for 'type'. I
would also suggest to use braces around 'type' and 'ID'.

> +
> +#endif	/* _DT_BINDINGS_MAILBOX_TEGRA186_HSP_H */
> -- 
> 2.9.0
> 
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