From: Chia-Wei Wang <chiawei_wang@aspeedtech.com>
To: <joel@jms.id.au>, <andrew@aj.id.au>, <robh+dt@kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-aspeed@lists.ozlabs.org>, <linux-kernel@vger.kernel.org>,
<devicetree@vger.kernel.org>, <openbmc@lists.ozlabs.org>
Cc: yulei.sh@bytedance.com, osk@google.com
Subject: [PATCH v4 2/4] dt-bindings: aspeed: Add UART routing controller
Date: Mon, 13 Sep 2021 14:02:29 +0800 [thread overview]
Message-ID: <20210913060231.15619-3-chiawei_wang@aspeedtech.com> (raw)
In-Reply-To: <20210913060231.15619-1-chiawei_wang@aspeedtech.com>
Add dt-bindings for Aspeed UART routing controller.
Signed-off-by: Oskar Senft <osk@google.com>
Signed-off-by: Chia-Wei Wang <chiawei_wang@aspeedtech.com>
---
.../devicetree/bindings/mfd/aspeed-lpc.yaml | 4 ++
.../bindings/soc/aspeed/uart-routing.yaml | 70 +++++++++++++++++++
2 files changed, 74 insertions(+)
create mode 100644 Documentation/devicetree/bindings/soc/aspeed/uart-routing.yaml
diff --git a/Documentation/devicetree/bindings/mfd/aspeed-lpc.yaml b/Documentation/devicetree/bindings/mfd/aspeed-lpc.yaml
index 4e3862cf2a4b..f9aa431127ee 100644
--- a/Documentation/devicetree/bindings/mfd/aspeed-lpc.yaml
+++ b/Documentation/devicetree/bindings/mfd/aspeed-lpc.yaml
@@ -142,6 +142,10 @@ patternProperties:
- interrupts
- snoop-ports
+ "^uart-routing@[0-9a-f]+$":
+ $ref: /schemas/soc/aspeed/uart-routing.yaml#
+ description: The UART routing control under LPC register space
+
required:
- compatible
- reg
diff --git a/Documentation/devicetree/bindings/soc/aspeed/uart-routing.yaml b/Documentation/devicetree/bindings/soc/aspeed/uart-routing.yaml
new file mode 100644
index 000000000000..534b2a9340ce
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/aspeed/uart-routing.yaml
@@ -0,0 +1,70 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# # Copyright (c) 2018 Google LLC
+# # Copyright (c) 2021 Aspeed Technology Inc.
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/soc/aspeed/uart-routing.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Aspeed UART Routing Controller
+
+maintainers:
+ - Oskar Senft <osk@google.com>
+ - Chia-Wei Wang <chiawei_wang@aspeedtech.com>
+
+description:
+ The Aspeed UART routing control allow to dynamically route the inputs for
+ the built-in UARTS and physical serial I/O ports.
+
+ This allows, for example, to connect the output of UART to another UART.
+ This can be used to enable Host <-> BMC communication via UARTs, e.g. to
+ allow access to the Host's serial console.
+
+ This driver is for the BMC side. The sysfs files allow the BMC userspace
+ which owns the system configuration policy, to configure how UARTs and
+ physical serial I/O ports are routed.
+
+ Two types of files, uart* and io*, are presented in sysfs. The uart*
+ configures the input signal of a UART controller whereas io* configures
+ that of a physical serial port.
+
+ When read, each file shows the list of available options with currently
+ selected option marked by brackets "[]". The list of available options
+ depends on the selected file.
+
+ e.g.
+ cat /sys/bus/platform/drivers/aspeed-uart-routing/*.uart_routing/uart1
+ [io1] io2 io3 io4 uart2 uart3 uart4 io6
+
+ In this case, UART1 gets its input from IO1 (physical serial port 1).
+
+properties:
+ compatible:
+ items:
+ - enum:
+ - aspeed,ast2400-uart-routing
+ - aspeed,ast2500-uart-routing
+ - aspeed,ast2600-uart-routing
+ reg:
+ maxItems: 1
+
+required:
+ - compatible
+
+additionalProperties: false
+
+examples:
+ - |
+ lpc: lpc@1e789000 {
+ compatible = "aspeed,ast2600-lpc-v2", "simple-mfd", "syscon";
+ reg = <0x1e789000 0x1000>;
+
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges = <0x0 0x1e789000 0x1000>;
+
+ uart_routing: uart-routing@98 {
+ compatible = "aspeed,ast2600-uart-routing";
+ reg = <0x98 0x8>;
+ };
+ };
--
2.17.1
next prev parent reply other threads:[~2021-09-13 6:03 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-13 6:02 [PATCH v4 0/4] arm: aspeed: Add UART routing support Chia-Wei Wang
2021-09-13 6:02 ` [PATCH v4 1/4] dt-bindings: mfd: aspeed-lpc: Convert to YAML schema Chia-Wei Wang
2021-09-13 12:18 ` Rob Herring
2021-09-14 1:33 ` ChiaWei Wang
2021-09-14 12:28 ` Rob Herring
2021-09-15 2:21 ` ChiaWei Wang
2021-09-13 6:02 ` Chia-Wei Wang [this message]
2021-09-13 6:02 ` [PATCH v4 3/4] soc: aspeed: Add UART routing support Chia-Wei Wang
2021-09-13 6:02 ` [PATCH v4 4/4] ARM: dts: aspeed: Add uart routing to device tree Chia-Wei Wang
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