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Message-Id: <20240716103025.1198495-2-claudiu.beznea.uj@bp.renesas.com>
Date: Tue, 16 Jul 2024 13:30:15 +0300
From: Claudiu <claudiu.beznea@...on.dev>
To: lee@...nel.org,
robh@...nel.org,
krzk+dt@...nel.org,
conor+dt@...nel.org,
alexandre.belloni@...tlin.com,
geert+renesas@...der.be,
magnus.damm@...il.com,
mturquette@...libre.com,
sboyd@...nel.org,
p.zabel@...gutronix.de
Cc: devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-rtc@...r.kernel.org,
linux-renesas-soc@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-clk@...r.kernel.org,
claudiu.beznea@...on.dev,
Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: [PATCH v2 01/11] dt-bindings: mfd: renesas,r9a08g045-vbattb: Document VBATTB
From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
The VBATTB IP of the Renesas RZ/G3S SoC controls the clock for RTC,
the tamper detector and a small general usage memory of 128B. Add
documentation for it.
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
---
Changes in v2:
- changed file name and compatible
- updated title, description sections
- added clock controller part documentation and drop dedicated file
for it included in v1
- used items to describe interrupts, interrupt-names, clocks, clock-names,
resets
- dropped node labels and status
- updated clock-names for clock controller to cope with the new
logic on detecting the necessity to setup bypass
.../mfd/renesas,r9a08g045-vbattb.yaml | 136 ++++++++++++++++++
1 file changed, 136 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mfd/renesas,r9a08g045-vbattb.yaml
diff --git a/Documentation/devicetree/bindings/mfd/renesas,r9a08g045-vbattb.yaml b/Documentation/devicetree/bindings/mfd/renesas,r9a08g045-vbattb.yaml
new file mode 100644
index 000000000000..30e4da65e2f6
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/renesas,r9a08g045-vbattb.yaml
@@ -0,0 +1,136 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/renesas,r9a08g045-vbattb.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas Battery Backup Function (VBATTB)
+
+description:
+ Renesas VBATTB is an always on powered module (backed by battery) which
+ controls the RTC clock (VBATTCLK), tamper detection logic and a small
+ general usage memory (128B).
+
+maintainers:
+ - Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
+
+properties:
+ compatible:
+ const: renesas,r9a08g045-vbattb
+
+ reg:
+ maxItems: 1
+
+ ranges: true
+
+ interrupts:
+ items:
+ - description: tamper detector interrupt
+
+ interrupt-names:
+ items:
+ - const: tampdi
+
+ clocks:
+ items:
+ - description: VBATTB module clock
+
+ clock-names:
+ items:
+ - const: bclk
+
+ power-domains:
+ maxItems: 1
+
+ resets:
+ items:
+ - description: VBATTB module reset
+
+ '#address-cells':
+ const: 2
+
+ '#size-cells':
+ const: 2
+
+patternProperties:
+ "^clock-controller@...$":
+ type: object
+ description: VBATTCLK clock
+
+ properties:
+ compatible:
+ const: renesas,r9a08g045-vbattb-clk
+
+ reg:
+ maxItems: 1
+
+ clocks:
+ items:
+ - description: input clock for VBATTCLK
+
+ clock-names:
+ description: |
+ Use xin if connected to an external crystal oscillator.
+ Use clkin if connected to an external hardware device generating the
+ clock.
+ enum:
+ - xin
+ - clkin
+
+ '#clock-cells':
+ const: 0
+
+ renesas,vbattb-load-nanofarads:
+ description: load capacitance of the on board xtal
+ $ref: /schemas/types.yaml#/definitions/uint32
+ enum: [ 4000, 7000, 9000, 12500 ]
+
+ required:
+ - compatible
+ - reg
+ - clocks
+ - clock-names
+ - '#clock-cells'
+ - renesas,vbattb-load-nanofarads
+
+ additionalProperties: false
+
+required:
+ - compatible
+ - reg
+ - interrupts
+ - interrupt-names
+ - clocks
+ - clock-names
+ - power-domains
+ - resets
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/clock/r9a08g045-cpg.h>
+ #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+ vbattb@...5c000 {
+ compatible = "renesas,r9a08g045-vbattb";
+ reg = <0x1005c000 0x1000>;
+ ranges = <0 0 0x1005c000 0 0x1000>;
+ interrupts = <GIC_SPI 43 IRQ_TYPE_LEVEL_HIGH>;
+ interrupt-names = "tampdi";
+ clocks = <&cpg CPG_MOD R9A08G045_VBAT_BCLK>;
+ clock-names = "bclk";
+ power-domains = <&cpg>;
+ resets = <&cpg R9A08G045_VBAT_BRESETN>;
+ #address-cells = <2>;
+ #size-cells = <2>;
+
+ clock-controller@1c {
+ compatible = "renesas,r9a08g045-vbattb-clk";
+ reg = <0 0x1c 0 0x10>;
+ clocks = <&vbattb_xtal>;
+ clock-names = "xin";
+ #clock-cells = <0>;
+ renesas,vbattb-load-nanofarads = <12500>;
+ };
+ };
--
2.39.2
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