| Message ID | 1519824270-7134-2-git-send-email-fabien.dessenne@st.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Wed, Feb 28, 2018 at 02:24:29PM +0100, Fabien Dessenne wrote: > Add a binding for the STMicroelectronics STM32 IPCC block exposing a > mailbox mechanism between two processors. > > Signed-off-by: Fabien Dessenne <fabien.dessenne@st.com> > Signed-off-by: Ludovic Barre <ludovic.barre@st.com> > --- > .../devicetree/bindings/mailbox/stm32-ipcc.txt | 48 ++++++++++++++++++++++ > 1 file changed, 48 insertions(+) > create mode 100644 Documentation/devicetree/bindings/mailbox/stm32-ipcc.txt > > diff --git a/Documentation/devicetree/bindings/mailbox/stm32-ipcc.txt b/Documentation/devicetree/bindings/mailbox/stm32-ipcc.txt > new file mode 100644 > index 0000000..2321689 > --- /dev/null > +++ b/Documentation/devicetree/bindings/mailbox/stm32-ipcc.txt > @@ -0,0 +1,48 @@ > +* STMicroelectronics STM32 IPCC (Inter-Processor Communication Controller) > + > +The IPCC block provides a non blocking signaling mechanism to post and > +retrieve messages in an atomic way between two processors. > +It provides the signaling for N bidirectionnal channels. The number of channels > +(N) can be read from a dedicated register. > + > +Required properties: > +- compatible: Must be "st,stm32-ipcc" Kind of generic. There's only 1 version of h/w across all stm32 parts? > +- reg: Register address range (base address and length) > +- st,proc_id: Processor id using the mailbox (0 or 1) s/_/-/ > +- clocks: Input clock > +- interrupt-names: List of names for the interrupts described by the interrupt > + property. Must contain the following entries: > + - "rx" > + - "tx" > +- interrupts: Interrupt specifiers for "rx channel occupied" and "tx channel > + free" > +- #mbox-cells: Number of cells required for the mailbox specifier. Must be 1. > + The data contained in the mbox specifier of the "mboxes" > + property in the client node is the mailbox channel index. > + > +Optional properties: > +- wakeup-source: Flag to indicate whether this device can wake up the system > +- interrupts: Wakeup interrupt used to wake up the system. > +- interrupt-names: "wakeup" for the wakeup interrupt. Make these required. "wakeup-source" alone determines if you use it. > + > + > + > +Example: > + ipcc: mailbox@4c001000 { > + compatible = "st,stm32-ipcc"; > + #mbox-cells = <1>; > + reg = <0x4c001000 0x400>; > + st,proc_id = <0>; > + interrupts-extended = <&intc GIC_SPI 100 IRQ_TYPE_NONE>, > + <&intc GIC_SPI 101 IRQ_TYPE_NONE>, > + <&aiec 62 1>; > + interrupt-names = "rx", "tx", "wakeup"; > + clocks = <&rcc_clk IPCC>; > + wakeup-source; > + } > + > +Client: > + mbox_test { > + ... > + mboxes = <&ipcc 0>, <&ipcc 1>; > + }; > -- > 2.7.4 >
2018-03-06 1:57 GMT+01:00 Rob Herring <robh@kernel.org>: > On Wed, Feb 28, 2018 at 02:24:29PM +0100, Fabien Dessenne wrote: >> Add a binding for the STMicroelectronics STM32 IPCC block exposing a >> mailbox mechanism between two processors. >> >> Signed-off-by: Fabien Dessenne <fabien.dessenne@st.com> >> Signed-off-by: Ludovic Barre <ludovic.barre@st.com> >> --- >> .../devicetree/bindings/mailbox/stm32-ipcc.txt | 48 ++++++++++++++++++++++ >> 1 file changed, 48 insertions(+) >> create mode 100644 Documentation/devicetree/bindings/mailbox/stm32-ipcc.txt >> >> diff --git a/Documentation/devicetree/bindings/mailbox/stm32-ipcc.txt b/Documentation/devicetree/bindings/mailbox/stm32-ipcc.txt >> new file mode 100644 >> index 0000000..2321689 >> --- /dev/null >> +++ b/Documentation/devicetree/bindings/mailbox/stm32-ipcc.txt >> @@ -0,0 +1,48 @@ >> +* STMicroelectronics STM32 IPCC (Inter-Processor Communication Controller) >> + >> +The IPCC block provides a non blocking signaling mechanism to post and >> +retrieve messages in an atomic way between two processors. >> +It provides the signaling for N bidirectionnal channels. The number of channels >> +(N) can be read from a dedicated register. >> + >> +Required properties: >> +- compatible: Must be "st,stm32-ipcc" > > Kind of generic. There's only 1 version of h/w across all stm32 parts? > We can check the version in one of the hardware block register. I guess in this case we can have this kind of generic compatible, right ? Benjamin >> +- reg: Register address range (base address and length) >> +- st,proc_id: Processor id using the mailbox (0 or 1) > > s/_/-/ > > >> +- clocks: Input clock >> +- interrupt-names: List of names for the interrupts described by the interrupt >> + property. Must contain the following entries: >> + - "rx" >> + - "tx" >> +- interrupts: Interrupt specifiers for "rx channel occupied" and "tx channel >> + free" >> +- #mbox-cells: Number of cells required for the mailbox specifier. Must be 1. >> + The data contained in the mbox specifier of the "mboxes" >> + property in the client node is the mailbox channel index. >> + >> +Optional properties: >> +- wakeup-source: Flag to indicate whether this device can wake up the system > >> +- interrupts: Wakeup interrupt used to wake up the system. >> +- interrupt-names: "wakeup" for the wakeup interrupt. > > Make these required. "wakeup-source" alone determines if you use it. > >> + >> + >> + >> +Example: >> + ipcc: mailbox@4c001000 { >> + compatible = "st,stm32-ipcc"; >> + #mbox-cells = <1>; >> + reg = <0x4c001000 0x400>; >> + st,proc_id = <0>; >> + interrupts-extended = <&intc GIC_SPI 100 IRQ_TYPE_NONE>, >> + <&intc GIC_SPI 101 IRQ_TYPE_NONE>, >> + <&aiec 62 1>; >> + interrupt-names = "rx", "tx", "wakeup"; >> + clocks = <&rcc_clk IPCC>; >> + wakeup-source; >> + } >> + >> +Client: >> + mbox_test { >> + ... >> + mboxes = <&ipcc 0>, <&ipcc 1>; >> + }; >> -- >> 2.7.4 >>
diff --git a/Documentation/devicetree/bindings/mailbox/stm32-ipcc.txt b/Documentation/devicetree/bindings/mailbox/stm32-ipcc.txt new file mode 100644 index 0000000..2321689 --- /dev/null +++ b/Documentation/devicetree/bindings/mailbox/stm32-ipcc.txt @@ -0,0 +1,48 @@ +* STMicroelectronics STM32 IPCC (Inter-Processor Communication Controller) + +The IPCC block provides a non blocking signaling mechanism to post and +retrieve messages in an atomic way between two processors. +It provides the signaling for N bidirectionnal channels. The number of channels +(N) can be read from a dedicated register. + +Required properties: +- compatible: Must be "st,stm32-ipcc" +- reg: Register address range (base address and length) +- st,proc_id: Processor id using the mailbox (0 or 1) +- clocks: Input clock +- interrupt-names: List of names for the interrupts described by the interrupt + property. Must contain the following entries: + - "rx" + - "tx" +- interrupts: Interrupt specifiers for "rx channel occupied" and "tx channel + free" +- #mbox-cells: Number of cells required for the mailbox specifier. Must be 1. + The data contained in the mbox specifier of the "mboxes" + property in the client node is the mailbox channel index. + +Optional properties: +- wakeup-source: Flag to indicate whether this device can wake up the system +- interrupts: Wakeup interrupt used to wake up the system. +- interrupt-names: "wakeup" for the wakeup interrupt. + + + +Example: + ipcc: mailbox@4c001000 { + compatible = "st,stm32-ipcc"; + #mbox-cells = <1>; + reg = <0x4c001000 0x400>; + st,proc_id = <0>; + interrupts-extended = <&intc GIC_SPI 100 IRQ_TYPE_NONE>, + <&intc GIC_SPI 101 IRQ_TYPE_NONE>, + <&aiec 62 1>; + interrupt-names = "rx", "tx", "wakeup"; + clocks = <&rcc_clk IPCC>; + wakeup-source; + } + +Client: + mbox_test { + ... + mboxes = <&ipcc 0>, <&ipcc 1>; + };