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Message-Id: <20200419201716.679090-3-lkundrak@v3.sk>
Date: Sun, 19 Apr 2020 22:17:16 +0200
From: Lubomir Rintel <lkundrak@...sk>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Rob Herring <robh+dt@...nel.org>, linux-serial@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
Lubomir Rintel <lkundrak@...sk>
Subject: [PATCH v2 2/2] dt-bindings: serial: Convert 8250 to json-schema
Some fixes were done during the conversion:
Slightly better examples. The original example was for an OMAP serial
port, which is not even described by this binding, but by
omap_serial.txt instead.
Added compatible strings, that were used, byt not documented:
andestech,uart16550, cavium,octeon-3860-uart, fsl,16550-FIFO64,
nvidia,tegra186-uart, nvidia,tegra194-uart, nxp,lpc1850-uart,
opencores,uart16550-rtlsvn105, ralink,mt7620a-uart, ralink,rt3052-uart,
ralink,rt3883-uart and xlnx,xps-uart16550-2.00.b.
Removed "serial" compatible string. It's redundant with the node name
(which, in OFW, serves the same purpose as the compatible string).
Signed-off-by: Lubomir Rintel <lkundrak@...sk>
---
Changes since v1, addressing review from Rob Herring [1]:
- Utilize anyOf: instead of allOf: to express mutual exclusivity of
clock-frequency and clocks.
- Allow ns16550a where ns16550 is used but actually has a working FIFO;
add a comment about ns16550a being preferred
- resets: specify maxItems based on actual use, drop description
- current-speed: add type ref
- used-by-rtas: add type
- no-loopback-test: add type, fix a typo in description
- fifo-size: add type ref
- auto-flow-control: add type
- tx-threshold: add type ref
- {rts,cts,dtr,dsr,rng,dcd}-gpios: drop description, redundant to
serial.yaml
[1] https://lore.kernel.org/lkml/CAL_Jsq+GDnYviCdszhghhEVB55giPHk8N9w_KASPXG_=H+ZQig@mail.gmail.com/
.../devicetree/bindings/serial/8250.txt | 102 --------
.../devicetree/bindings/serial/8250.yaml | 223 ++++++++++++++++++
2 files changed, 223 insertions(+), 102 deletions(-)
delete mode 100644 Documentation/devicetree/bindings/serial/8250.txt
create mode 100644 Documentation/devicetree/bindings/serial/8250.yaml
diff --git a/Documentation/devicetree/bindings/serial/8250.txt b/Documentation/devicetree/bindings/serial/8250.txt
deleted file mode 100644
index a543702859e2f..0000000000000
--- a/Documentation/devicetree/bindings/serial/8250.txt
+++ /dev/null
@@ -1,102 +0,0 @@
-* UART (Universal Asynchronous Receiver/Transmitter)
-
-Required properties:
-- compatible : one of:
- - "ns8250"
- - "ns16450"
- - "ns16550a"
- - "ns16550"
- - "ns16750"
- - "ns16850"
- - For Tegra20, must contain "nvidia,tegra20-uart"
- - For other Tegra, must contain '"nvidia,<chip>-uart",
- "nvidia,tegra20-uart"' where <chip> is tegra30, tegra114, tegra124,
- tegra132, or tegra210.
- - "nxp,lpc3220-uart"
- - "ralink,rt2880-uart"
- - For MediaTek BTIF, must contain '"mediatek,<chip>-btif",
- "mediatek,mtk-btif"' where <chip> is mt7622, mt7623.
- - "altr,16550-FIFO32"
- - "altr,16550-FIFO64"
- - "altr,16550-FIFO128"
- - "fsl,16550-FIFO64"
- - "fsl,ns16550"
- - "intel,xscale-uart"
- - "ti,da830-uart"
- - "aspeed,ast2400-vuart"
- - "aspeed,ast2500-vuart"
- - "nuvoton,npcm750-uart"
- - "mrvl,mmp-uart"
- - "mrvl,pxa-uart"
- - "serial" if the port type is unknown.
-- reg : offset and length of the register set for the device.
-- interrupts : should contain uart interrupt.
-- clock-frequency : the input clock frequency for the UART
- or
- clocks phandle to refer to the clk used as per Documentation/devicetree
- /bindings/clock/clock-bindings.txt
-
-Optional properties:
-- current-speed : the current active speed of the UART.
-- reg-offset : offset to apply to the mapbase from the start of the registers.
-- reg-shift : quantity to shift the register offsets by.
-- reg-io-width : the size (in bytes) of the IO accesses that should be
- performed on the device. There are some systems that require 32-bit
- accesses to the UART (e.g. TI davinci).
-- used-by-rtas : set to indicate that the port is in use by the OpenFirmware
- RTAS and should not be registered.
-- no-loopback-test: set to indicate that the port does not implements loopback
- test mode
-- fifo-size: the fifo size of the UART.
-- auto-flow-control: one way to enable automatic flow control support. The
- driver is allowed to detect support for the capability even without this
- property.
-- tx-threshold: Specify the TX FIFO low water indication for parts with
- programmable TX FIFO thresholds.
-- resets : phandle + reset specifier pairs
-- overrun-throttle-ms : how long to pause uart rx when input overrun is encountered.
-- {rts,cts,dtr,dsr,rng,dcd}-gpios: specify a GPIO for RTS/CTS/DTR/DSR/RI/DCD
- line respectively. It will use specified GPIO instead of the peripheral
- function pin for the UART feature. If unsure, don't specify this property.
-- aspeed,sirq-polarity-sense: Only applicable to aspeed,ast2500-vuart.
- phandle to aspeed,ast2500-scu compatible syscon alongside register offset
- and bit number to identify how the SIRQ polarity should be configured.
- One possible data source is the LPC/eSPI mode bit.
- Example: aspeed,sirq-polarity-sense = <&syscon 0x70 25>
-
-Note:
-* fsl,ns16550:
- ------------
- Freescale DUART is very similar to the PC16552D (and to a
- pair of NS16550A), albeit with some nonstandard behavior such as
- erratum A-004737 (relating to incorrect BRK handling).
-
- Represents a single port that is compatible with the DUART found
- on many Freescale chips (examples include mpc8349, mpc8548,
- mpc8641d, p4080 and ls2085a).
-
-Example:
-
- uart@...30000 {
- compatible = "ns8250";
- reg = <0x80230000 0x100>;
- clock-frequency = <3686400>;
- interrupts = <10>;
- reg-shift = <2>;
- };
-
-Example for OMAP UART using GPIO-based modem control signals:
-
- uart4: serial@...42000 {
- compatible = "ti,omap3-uart";
- reg = <0x49042000 0x400>;
- interrupts = <80>;
- ti,hwmods = "uart4";
- clock-frequency = <48000000>;
- cts-gpios = <&gpio3 5 GPIO_ACTIVE_LOW>;
- rts-gpios = <&gpio3 6 GPIO_ACTIVE_LOW>;
- dtr-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>;
- dsr-gpios = <&gpio1 13 GPIO_ACTIVE_LOW>;
- dcd-gpios = <&gpio1 14 GPIO_ACTIVE_LOW>;
- rng-gpios = <&gpio1 15 GPIO_ACTIVE_LOW>;
- };
diff --git a/Documentation/devicetree/bindings/serial/8250.yaml b/Documentation/devicetree/bindings/serial/8250.yaml
new file mode 100644
index 0000000000000..56a465d7e1199
--- /dev/null
+++ b/Documentation/devicetree/bindings/serial/8250.yaml
@@ -0,0 +1,223 @@
+# Copyright 2020 Lubomir Rintel <lkundrak@...sk>
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/serial/8250.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: UART (Universal Asynchronous Receiver/Transmitter) bindings
+
+maintainers:
+ - devicetree@...r.kernel.org
+
+allOf:
+ - $ref: /schemas/serial.yaml#
+ - if:
+ required:
+ - aspeed,sirq-polarity-sense
+ then:
+ properties:
+ compatible:
+ const: aspeed,ast2500-vuart
+ - if:
+ properties:
+ compatible:
+ const: mrvl,mmp-uart
+ then:
+ properties:
+ reg-shift:
+ const: 2
+ required:
+ - reg-shift
+
+anyOf:
+ - required: [ clock-frequency ]
+ - required: [ clocks ]
+
+properties:
+ compatible:
+ oneOf:
+ - const: ns8250
+ - const: ns16450
+ - const: ns16550
+ - const: ns16550a
+ - const: ns16850
+ - const: aspeed,ast2400-vuart
+ - const: aspeed,ast2500-vuart
+ - const: intel,xscale-uart
+ - const: mrvl,pxa-uart
+ - const: nuvoton,npcm750-uart
+ - const: nvidia,tegra20-uart
+ - const: nxp,lpc3220-uart
+ - items:
+ - enum:
+ - altr,16550-FIFO32
+ - altr,16550-FIFO64
+ - altr,16550-FIFO128
+ - fsl,16550-FIFO64
+ - fsl,ns16550
+ - andestech,uart16550
+ - nxp,lpc1850-uart
+ - opencores,uart16550-rtlsvn105
+ - ti,da830-uart
+ - const: ns16550a
+ - items:
+ - enum:
+ - ns16750
+ - cavium,octeon-3860-uart
+ - xlnx,xps-uart16550-2.00.b
+ - ralink,rt2880-uart
+ - enum:
+ - ns16550 # Deprecated, unless the FIFO really is broken
+ - ns16550a
+ - items:
+ - enum:
+ - ralink,mt7620a-uart
+ - ralink,rt3052-uart
+ - ralink,rt3883-uart
+ - const: ralink,rt2880-uart
+ - enum:
+ - ns16550 # Deprecated, unless the FIFO really is broken
+ - ns16550a
+ - items:
+ - enum:
+ - mediatek,mt7622-btif
+ - mediatek,mt7623-btif
+ - const: mediatek,mtk-btif
+ - items:
+ - enum:
+ - mediatek,mt7622-btif
+ - mediatek,mt7623-btif
+ - const: mediatek,mtk-btif
+ - items:
+ - const: mrvl,mmp-uart
+ - const: intel,xscale-uart
+ - items:
+ - enum:
+ - nvidia,tegra30-uart
+ - nvidia,tegra114-uart
+ - nvidia,tegra124-uart
+ - nvidia,tegra186-uart
+ - nvidia,tegra194-uart
+ - nvidia,tegra210-uart
+ - const: nvidia,tegra20-uart
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ maxItems: 1
+
+ clock-frequency: true
+
+ clocks:
+ maxItems: 1
+
+ resets:
+ maxItems: 1
+
+ current-speed:
+ $ref: /schemas/types.yaml#definitions/uint32
+ description: The current active speed of the UART.
+
+ reg-offset:
+ description: |
+ Offset to apply to the mapbase from the start of the registers.
+
+ reg-shift:
+ description: Quantity to shift the register offsets by.
+
+ reg-io-width:
+ description: |
+ The size (in bytes) of the IO accesses that should be performed on the
+ device. There are some systems that require 32-bit accesses to the
+ UART (e.g. TI davinci).
+
+ used-by-rtas:
+ type: boolean
+ description: |
+ Set to indicate that the port is in use by the OpenFirmware RTAS and
+ should not be registered.
+
+ no-loopback-test:
+ type: boolean
+ description: |
+ Set to indicate that the port does not implement loopback test mode.
+
+ fifo-size:
+ $ref: /schemas/types.yaml#definitions/uint32
+ description: The fifo size of the UART.
+
+ auto-flow-control:
+ type: boolean
+ description: |
+ One way to enable automatic flow control support. The driver is
+ allowed to detect support for the capability even without this
+ property.
+
+ tx-threshold:
+ $ref: /schemas/types.yaml#definitions/uint32
+ description: |
+ Specify the TX FIFO low water indication for parts with programmable
+ TX FIFO thresholds.
+
+ overrun-throttle-ms:
+ description: |
+ How long to pause uart rx when input overrun is encountered.
+
+ rts-gpios: true
+ cts-gpios: true
+ dtr-gpios: true
+ dsr-gpios: true
+ rng-gpios: true
+ dcd-gpios: true
+
+ aspeed,sirq-polarity-sense:
+ $ref: /schemas/types.yaml#/definitions/phandle-array
+ description: |
+ Phandle to aspeed,ast2500-scu compatible syscon alongside register
+ offset and bit number to identify how the SIRQ polarity should be
+ configured. One possible data source is the LPC/eSPI mode bit. Only
+ applicable to aspeed,ast2500-vuart.
+
+required:
+ - reg
+ - interrupts
+
+additionalProperties: false
+
+examples:
+ - |
+ serial@...30000 {
+ compatible = "ns8250";
+ reg = <0x80230000 0x100>;
+ interrupts = <10>;
+ reg-shift = <2>;
+ clock-frequency = <48000000>;
+ };
+ - |
+ #include <dt-bindings/gpio/gpio.h>
+ serial@...42000 {
+ compatible = "andestech,uart16550", "ns16550a";
+ reg = <0x49042000 0x400>;
+ interrupts = <80>;
+ clock-frequency = <48000000>;
+ cts-gpios = <&gpio3 5 GPIO_ACTIVE_LOW>;
+ rts-gpios = <&gpio3 6 GPIO_ACTIVE_LOW>;
+ dtr-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>;
+ dsr-gpios = <&gpio1 13 GPIO_ACTIVE_LOW>;
+ dcd-gpios = <&gpio1 14 GPIO_ACTIVE_LOW>;
+ rng-gpios = <&gpio1 15 GPIO_ACTIVE_LOW>;
+ };
+ - |
+ #include <dt-bindings/clock/aspeed-clock.h>
+ serial@...87000 {
+ compatible = "aspeed,ast2500-vuart";
+ reg = <0x1e787000 0x40>;
+ reg-shift = <2>;
+ interrupts = <8>;
+ clocks = <&syscon ASPEED_CLK_APB>;
+ no-loopback-test;
+ aspeed,sirq-polarity-sense = <&syscon 0x70 25>;
+ };
+
+...
--
2.26.0
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