From: Serge Semin <Sergey.Semin@xxxxxxxxxxxxxxxxxxxx> This is a specific block embedded into the Baikal-T1 SoC, which is dedicated to detect APB-bus protocol errors and tune the peripheral access timeout. So the dts bindings implies that corresponding dts node would be equipped with "be,bt1-apb-ehb" compatible string, MMIO region of registers space and of space with no device mapped, interrupts property and with an APB-reference clock handler. Signed-off-by: Serge Semin <Sergey.Semin@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Alexey Malahov <Alexey.Malahov@xxxxxxxxxxxxxxxxxxxx> Cc: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx> Cc: Paul Burton <paulburton@xxxxxxxxxx> Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx> Cc: Arnd Bergmann <arnd@xxxxxxxx> Cc: Olof Johansson <olof@xxxxxxxxx> Cc: soc@xxxxxxxxxx --- .../soc/baikal-t1/be,bt1-apb-ehb.yaml | 66 +++++++++++++++++++ 1 file changed, 66 insertions(+) create mode 100644 Documentation/devicetree/bindings/soc/baikal-t1/be,bt1-apb-ehb.yaml diff --git a/Documentation/devicetree/bindings/soc/baikal-t1/be,bt1-apb-ehb.yaml b/Documentation/devicetree/bindings/soc/baikal-t1/be,bt1-apb-ehb.yaml new file mode 100644 index 000000000000..e262aead2fb5 --- /dev/null +++ b/Documentation/devicetree/bindings/soc/baikal-t1/be,bt1-apb-ehb.yaml @@ -0,0 +1,66 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Copyright (C) 2019 - 2020 BAIKAL ELECTRONICS, JSC +# +# Baikal-T1 APB-bus Errors Handler Block Device Tree Bindings. +# +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/soc/baikal-t1/be,bt1-apb-ehb.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Baikal-T1 APB-bus Errors Handler Block + +maintainers: + - Serge Semin <fancer.lancer@xxxxxxxxx> + +description: | + Configuration registers of Baikal-T1 SoC peripheral interfaces are accessed + by means of the APB-bus. In case of any APB protocol collisions, slave device + not responding on timeout an IRQ is raised with an erroneous address reported + to the APB terminator (EHB) sub-block described by this bindings file. + +properties: + compatible: + const: be,bt1-apb-ehb + + reg: + items: + - description: APB EHB MMIO registers. + - description: APB MMIO region with no any device mapped. + + interrupts: + maxItems: 1 + + clocks: + description: APB reference clock. + maxItems: 1 + + clock-names: + const: ref + +additionalProperties: false + +required: + - compatible + - reg + - interrupts + - clocks + - clock-names + +examples: + - | + #include <dt-bindings/interrupt-controller/mips-gic.h> + #include <dt-bindings/clock/bt1-ccu.h> + + apb_ehb: ehb@1F059000 { + compatible = "be,bt1-apb-ehb"; + reg = <0x1F059000 0x1000>, + <0x1D000000 0x2040000>; + + interrupts = <GIC_SHARED 16 IRQ_TYPE_LEVEL_HIGH>; + + clocks = <&ccu_sys CCU_SYS_APB_CLK>; + clock-names = "ref"; + }; +... -- 2.25.1
