[PATCH v2 0/5] serial: Add Generic Serial Device Tree Bindings

[PATCH v2 0/5] serial: Add Generic Serial Device Tree Bindings

[Geert Uytterhoeven]

	Hi Greg, Jiri,

This patch series, against next-20160422, introduces Generic Serial
Device Tree Bindings, and converts drivers using vendor-specific DT
properties to the generic properies where appropriate.

The Generic Serial Device Tree Bindings document a set of generic
properties for describing UARTs in a device tree:
  1. The GPIO modem control properties are currently duplicated across
     hardware-specific binding documentation,
  2. The property for dedicated RTS/CTS hardware flow control lines is
     already supported by several drivers, albeit with a vendor-specific
     prefix, hence make it generic.
Whether these generic properties apply to a particular device still
depends on the DT bindings of the actual device.

The old (deprecated) vendor-specific properties are still supported by
the drivers for backwards compatibility.

Changes compared to v1:
  - Add Acked-by,
  - Drop out[12]-gpios from the bindings (a patch to drop it from the
    code has been submitted separately).

I will sent out patches to update the actual DTS files later, after this
series has been integrated into mainline.  DTS updates typically go
through a different path (e.g. arm-soc), and RTS/CTS support would be
broken if the DTSes would be updated before the drivers.

Thanks for applying!

Geert Uytterhoeven (5):
  doc: DT: Add Generic Serial Device Tree Bindings
  serial: imx: Use generic uart-has-rtscts DT property
  serial: mxs-auart: Use generic uart-has-rtscts DT property
  serial: sirf: Introduce helper variable struct device_node *np
  serial: sirf: Use generic uart-has-rtscts DT property

 .../devicetree/bindings/serial/fsl-imx-uart.txt    |  4 +-
 .../devicetree/bindings/serial/fsl-mxs-auart.txt   |  2 +-
 .../devicetree/bindings/serial/serial.txt          | 57 ++++++++++++++++++++++
 .../devicetree/bindings/serial/sirf-uart.txt       |  8 +--
 drivers/tty/serial/imx.c                           |  3 +-
 drivers/tty/serial/mxs-auart.c                     |  3 +-
 drivers/tty/serial/sirfsoc_uart.c                  | 39 ++++++++-------
 7 files changed, 87 insertions(+), 29 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/serial/serial.txt

-- 
1.9.1

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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[PATCH v2 1/5] doc: DT: Add Generic Serial Device Tree Bindings

[Geert Uytterhoeven]

Document a set of generic properties for describing UARTs in a
device tree:
  1. The GPIO modem control properties are currently duplicated across
     hardware-specific binding documentation,
  2. The property for dedicated RTS/CTS hardware flow control lines is
     already supported by several drivers, albeit with a vendor-specific
     prefix, hence make it generic.

Signed-off-by: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>
Acked-by: Rob Herring <rob-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
v2:
  - Add Acked-by,
  - Drop out[12]-gpios.
---
 .../devicetree/bindings/serial/serial.txt          | 57 ++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/serial/serial.txt

diff --git a/Documentation/devicetree/bindings/serial/serial.txt b/Documentation/devicetree/bindings/serial/serial.txt
new file mode 100644
index 0000000000000000..fd970f76a7b8ef0c
--- /dev/null
+++ b/Documentation/devicetree/bindings/serial/serial.txt
@@ -0,0 +1,57 @@
+Generic Serial DT Bindings
+
+This document lists a set of generic properties for describing UARTs in a
+device tree.  Whether these properties apply to a particular device depends on
+the DT bindings for the actual device.
+
+Optional properties:
+  - cts-gpios: Must contain a GPIO specifier, referring to the GPIO pin to be
+    used as the UART's CTS line.
+  - dcd-gpios: Must contain a GPIO specifier, referring to the GPIO pin to be
+    used as the UART's DCD line.
+  - dsr-gpios: Must contain a GPIO specifier, referring to the GPIO pin to be
+    used as the UART's DSR line.
+  - dtr-gpios: Must contain a GPIO specifier, referring to the GPIO pin to be
+    used as the UART's DTR line.
+  - rng-gpios: Must contain a GPIO specifier, referring to the GPIO pin to be
+    used as the UART's RNG line.
+  - rts-gpios: Must contain a GPIO specifier, referring to the GPIO pin to be
+    used as the UART's RTS line.
+
+  - uart-has-rtscts: The presence of this property indicates that the
+    UART has dedicated lines for RTS/CTS hardware flow control, and that
+    they are available for use (wired and enabled by pinmux configuration).
+    This depends on both the UART hardware and the board wiring.
+    Note that this property is mutually-exclusive with "cts-gpios" and
+    "rts-gpios" above.
+
+
+Examples:
+
+	uart1: serial@48022000 {
+		compatible = "ti,am3352-uart", "ti,omap3-uart";
+		ti,hwmods = "uart2";
+		clock-frequency = <48000000>;
+		reg = <0x48022000 0x2000>;
+		interrupts = <73>;
+		dmas = <&edma 28 0>, <&edma 29 0>;
+		dma-names = "tx", "rx";
+		dtr-gpios = <&gpio2 22 GPIO_ACTIVE_LOW>;
+		dsr-gpios = <&gpio2 23 GPIO_ACTIVE_LOW>;
+		dcd-gpios = <&gpio2 24 GPIO_ACTIVE_LOW>;
+		rng-gpios = <&gpio2 25 GPIO_ACTIVE_LOW>;
+		cts-gpios = <&gpio0 12 GPIO_ACTIVE_LOW>;
+		rts-gpios = <&gpio0 13 GPIO_ACTIVE_LOW>;
+		status = "okay";
+	};
+
+	scifa4: serial@e6c80000 {
+		compatible = "renesas,scifa-sh73a0", "renesas,scifa";
+		reg = <0xe6c80000 0x100>;
+		interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&mstp2_clks SH73A0_CLK_SCIFA4>;
+		clock-names = "fck";
+		power-domains = <&pd_a3sp>;
+		uart-has-rtscts;
+		status = "okay";
+	};
-- 
1.9.1

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Re: [PATCH v2 1/5] doc: DT: Add Generic Serial Device Tree Bindings

[Arnd Bergmann]

On Friday 22 April 2016 17:22:20 Geert Uytterhoeven wrote:
> Document a set of generic properties for describing UARTs in a
> device tree:
>   1. The GPIO modem control properties are currently duplicated across
>      hardware-specific binding documentation,
>   2. The property for dedicated RTS/CTS hardware flow control lines is
>      already supported by several drivers, albeit with a vendor-specific
>      prefix, hence make it generic.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>
> Acked-by: Rob Herring <rob-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> 

Acked-by: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
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[PATCH v2 2/5] serial: imx: Use generic uart-has-rtscts DT property

[Geert Uytterhoeven]

Convert the Freescale IMX UART driver from using the vendor-specific
"fsl,uart-has-rtscts" to the generic "uart-has-rtscts" DT property, as
documented by the Generic Serial DT Bindings.

The old vendor-specific property is still recognized by the driver for
backwards compatibility, but deprecated.

Signed-off-by: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>
---
v2:
  - No changes.

 Documentation/devicetree/bindings/serial/fsl-imx-uart.txt | 4 ++--
 drivers/tty/serial/imx.c                                  | 3 ++-
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/serial/fsl-imx-uart.txt b/Documentation/devicetree/bindings/serial/fsl-imx-uart.txt
index ed94c217c98d18a6..1e82802d8e322db5 100644
--- a/Documentation/devicetree/bindings/serial/fsl-imx-uart.txt
+++ b/Documentation/devicetree/bindings/serial/fsl-imx-uart.txt
@@ -6,7 +6,7 @@ Required properties:
 - interrupts : Should contain uart interrupt
 
 Optional properties:
-- fsl,uart-has-rtscts : Indicate the uart has rts and cts
+- uart-has-rtscts : Indicate the uart has rts and cts
 - fsl,irda-mode : Indicate the uart supports irda mode
 - fsl,dte-mode : Indicate the uart works in DTE mode. The uart works
                   in DCE mode by default.
@@ -24,6 +24,6 @@ uart1: serial@73fbc000 {
 	compatible = "fsl,imx51-uart", "fsl,imx21-uart";
 	reg = <0x73fbc000 0x4000>;
 	interrupts = <31>;
-	fsl,uart-has-rtscts;
+	uart-has-rtscts;
 	fsl,dte-mode;
 };
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 231e7d5caf6c1845..9fc09d3de1e2428b 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1927,7 +1927,8 @@ static int serial_imx_probe_dt(struct imx_port *sport,
 	}
 	sport->port.line = ret;
 
-	if (of_get_property(np, "fsl,uart-has-rtscts", NULL))
+	if (of_get_property(np, "uart-has-rtscts", NULL) ||
+	    of_get_property(np, "fsl,uart-has-rtscts", NULL) /* deprecated */)
 		sport->have_rtscts = 1;
 
 	if (of_get_property(np, "fsl,dte-mode", NULL))
-- 
1.9.1

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Re: [PATCH v2 2/5] serial: imx: Use generic uart-has-rtscts DT property

[Rob Herring]

On Fri, Apr 22, 2016 at 05:22:21PM +0200, Geert Uytterhoeven wrote:
> Convert the Freescale IMX UART driver from using the vendor-specific
> "fsl,uart-has-rtscts" to the generic "uart-has-rtscts" DT property, as
> documented by the Generic Serial DT Bindings.
> 
> The old vendor-specific property is still recognized by the driver for
> backwards compatibility, but deprecated.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>
> ---
> v2:
>   - No changes.
> 
>  Documentation/devicetree/bindings/serial/fsl-imx-uart.txt | 4 ++--
>  drivers/tty/serial/imx.c                                  | 3 ++-
>  2 files changed, 4 insertions(+), 3 deletions(-)

Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
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[PATCH v2 3/5] serial: mxs-auart: Use generic uart-has-rtscts DT property

[Geert Uytterhoeven]

Convert the Freescale MXS AUART driver from using the vendor-specific
"fsl,uart-has-rtscts" to the generic "uart-has-rtscts" DT property, as
documented by the Generic Serial DT Bindings.

The old vendor-specific property is still recognized by the driver for
backwards compatibility, but it is deprecated.

Signed-off-by: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>
---
v2:
  - No changes.

 Documentation/devicetree/bindings/serial/fsl-mxs-auart.txt | 2 +-
 drivers/tty/serial/mxs-auart.c                             | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/serial/fsl-mxs-auart.txt b/Documentation/devicetree/bindings/serial/fsl-mxs-auart.txt
index 7c408c87e6138979..9ba60c14047a0be8 100644
--- a/Documentation/devicetree/bindings/serial/fsl-mxs-auart.txt
+++ b/Documentation/devicetree/bindings/serial/fsl-mxs-auart.txt
@@ -11,7 +11,7 @@ Required properties:
 - dma-names: "rx" for RX channel, "tx" for TX channel.
 
 Optional properties:
-- fsl,uart-has-rtscts : Indicate the UART has RTS and CTS lines
+- uart-has-rtscts : Indicate the UART has RTS and CTS lines
   for hardware flow control,
 	it also means you enable the DMA support for this UART.
 - {rts,cts,dtr,dsr,rng,dcd}-gpios: specify a GPIO for RTS/CTS/DTR/DSR/RI/DCD
diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index cd0414bbe094898e..c988544f38bbb885 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -1185,7 +1185,8 @@ static int serial_mxs_probe_dt(struct mxs_auart_port *s,
 	}
 	s->port.line = ret;
 
-	if (of_get_property(np, "fsl,uart-has-rtscts", NULL))
+	if (of_get_property(np, "uart-has-rtscts", NULL) ||
+	    of_get_property(np, "fsl,uart-has-rtscts", NULL) /* deprecated */)
 		set_bit(MXS_AUART_RTSCTS, &s->flags);
 
 	return 0;
-- 
1.9.1

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Re: [PATCH v2 3/5] serial: mxs-auart: Use generic uart-has-rtscts DT property

[Rob Herring]

On Fri, Apr 22, 2016 at 05:22:22PM +0200, Geert Uytterhoeven wrote:
> Convert the Freescale MXS AUART driver from using the vendor-specific
> "fsl,uart-has-rtscts" to the generic "uart-has-rtscts" DT property, as
> documented by the Generic Serial DT Bindings.
> 
> The old vendor-specific property is still recognized by the driver for
> backwards compatibility, but it is deprecated.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>
> ---
> v2:
>   - No changes.
> 
>  Documentation/devicetree/bindings/serial/fsl-mxs-auart.txt | 2 +-
>  drivers/tty/serial/mxs-auart.c                             | 3 ++-
>  2 files changed, 3 insertions(+), 2 deletions(-)

Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
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[PATCH v2 4/5] serial: sirf: Introduce helper variable struct device_node *np

[Geert Uytterhoeven]

Signed-off-by: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>
---
v2:
  - No changes.

 drivers/tty/serial/sirfsoc_uart.c | 38 ++++++++++++++++++--------------------
 1 file changed, 18 insertions(+), 20 deletions(-)

diff --git a/drivers/tty/serial/sirfsoc_uart.c b/drivers/tty/serial/sirfsoc_uart.c
index c6657de789977c90..1d1c0b9857ff6900 100644
--- a/drivers/tty/serial/sirfsoc_uart.c
+++ b/drivers/tty/serial/sirfsoc_uart.c
@@ -1264,6 +1264,7 @@ MODULE_DEVICE_TABLE(of, sirfsoc_uart_ids);
 
 static int sirfsoc_uart_probe(struct platform_device *pdev)
 {
+	struct device_node *np = pdev->dev.of_node;
 	struct sirfsoc_uart_port *sirfport;
 	struct uart_port *port;
 	struct resource *res;
@@ -1276,13 +1277,13 @@ static int sirfsoc_uart_probe(struct platform_device *pdev)
 	};
 	const struct of_device_id *match;
 
-	match = of_match_node(sirfsoc_uart_ids, pdev->dev.of_node);
+	match = of_match_node(sirfsoc_uart_ids, np);
 	sirfport = devm_kzalloc(&pdev->dev, sizeof(*sirfport), GFP_KERNEL);
 	if (!sirfport) {
 		ret = -ENOMEM;
 		goto err;
 	}
-	sirfport->port.line = of_alias_get_id(pdev->dev.of_node, "serial");
+	sirfport->port.line = of_alias_get_id(np, "serial");
 	sirf_ports[sirfport->port.line] = sirfport;
 	sirfport->port.iotype = UPIO_MEM;
 	sirfport->port.flags = UPF_BOOT_AUTOCONF;
@@ -1291,25 +1292,24 @@ static int sirfsoc_uart_probe(struct platform_device *pdev)
 	port->private_data = sirfport;
 	sirfport->uart_reg = (struct sirfsoc_uart_register *)match->data;
 
-	sirfport->hw_flow_ctrl = of_property_read_bool(pdev->dev.of_node,
-		"sirf,uart-has-rtscts");
-	if (of_device_is_compatible(pdev->dev.of_node, "sirf,prima2-uart") ||
-		of_device_is_compatible(pdev->dev.of_node, "sirf,atlas7-uart"))
+	sirfport->hw_flow_ctrl =
+		of_property_read_bool(np, "sirf,uart-has-rtscts");
+	if (of_device_is_compatible(np, "sirf,prima2-uart") ||
+		of_device_is_compatible(np, "sirf,atlas7-uart"))
 		sirfport->uart_reg->uart_type = SIRF_REAL_UART;
-	if (of_device_is_compatible(pdev->dev.of_node,
-		"sirf,prima2-usp-uart") || of_device_is_compatible(
-		pdev->dev.of_node, "sirf,atlas7-usp-uart")) {
+	if (of_device_is_compatible(np, "sirf,prima2-usp-uart") ||
+	    of_device_is_compatible(np, "sirf,atlas7-usp-uart")) {
 		sirfport->uart_reg->uart_type =	SIRF_USP_UART;
 		if (!sirfport->hw_flow_ctrl)
 			goto usp_no_flow_control;
-		if (of_find_property(pdev->dev.of_node, "cts-gpios", NULL))
-			sirfport->cts_gpio = of_get_named_gpio(
-					pdev->dev.of_node, "cts-gpios", 0);
+		if (of_find_property(np, "cts-gpios", NULL))
+			sirfport->cts_gpio =
+				of_get_named_gpio(np, "cts-gpios", 0);
 		else
 			sirfport->cts_gpio = -1;
-		if (of_find_property(pdev->dev.of_node, "rts-gpios", NULL))
-			sirfport->rts_gpio = of_get_named_gpio(
-					pdev->dev.of_node, "rts-gpios", 0);
+		if (of_find_property(np, "rts-gpios", NULL))
+			sirfport->rts_gpio =
+				of_get_named_gpio(np, "rts-gpios", 0);
 		else
 			sirfport->rts_gpio = -1;
 
@@ -1336,13 +1336,11 @@ static int sirfsoc_uart_probe(struct platform_device *pdev)
 		gpio_direction_output(sirfport->rts_gpio, 1);
 	}
 usp_no_flow_control:
-	if (of_device_is_compatible(pdev->dev.of_node, "sirf,atlas7-uart") ||
-	    of_device_is_compatible(pdev->dev.of_node, "sirf,atlas7-usp-uart"))
+	if (of_device_is_compatible(np, "sirf,atlas7-uart") ||
+	    of_device_is_compatible(np, "sirf,atlas7-usp-uart"))
 		sirfport->is_atlas7 = true;
 
-	if (of_property_read_u32(pdev->dev.of_node,
-			"fifosize",
-			&port->fifosize)) {
+	if (of_property_read_u32(np, "fifosize", &port->fifosize)) {
 		dev_err(&pdev->dev,
 			"Unable to find fifosize in uart node.\n");
 		ret = -EFAULT;
-- 
1.9.1

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[PATCH v2 5/5] serial: sirf: Use generic uart-has-rtscts DT property

[Geert Uytterhoeven]

Convert the SiRF UART driver from using the vendor-specific
"sirf,uart-has-rtscts" to the generic "uart-has-rtscts" DT property, as
documented by the Generic Serial DT Bindings.

The old vendor-specific property is still recognized by the driver for
backwards compatibility, but deprecated.

Signed-off-by: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>
---
v2:
  - No changes.

 Documentation/devicetree/bindings/serial/sirf-uart.txt | 8 ++++----
 drivers/tty/serial/sirfsoc_uart.c                      | 3 ++-
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/serial/sirf-uart.txt b/Documentation/devicetree/bindings/serial/sirf-uart.txt
index 67e2a0aeb0429572..1e48bbbeecc6dd27 100644
--- a/Documentation/devicetree/bindings/serial/sirf-uart.txt
+++ b/Documentation/devicetree/bindings/serial/sirf-uart.txt
@@ -9,9 +9,9 @@ Required properties:
 - clocks : Should contain uart clock number
 
 Optional properties:
-- sirf,uart-has-rtscts: we have hardware flow controller pins in hardware
-- rts-gpios: RTS pin for USP-based UART if sirf,uart-has-rtscts is true
-- cts-gpios: CTS pin for USP-based UART if sirf,uart-has-rtscts is true
+- uart-has-rtscts: we have hardware flow controller pins in hardware
+- rts-gpios: RTS pin for USP-based UART if uart-has-rtscts is true
+- cts-gpios: CTS pin for USP-based UART if uart-has-rtscts is true
 
 Example:
 
@@ -28,7 +28,7 @@ On the board-specific dts, we can put rts-gpios and cts-gpios like
 
 usp@b0090000 {
 	compatible = "sirf,prima2-usp-uart";
-	sirf,uart-has-rtscts;
+	uart-has-rtscts;
 	rts-gpios = <&gpio 15 0>;
 	cts-gpios = <&gpio 46 0>;
 };
diff --git a/drivers/tty/serial/sirfsoc_uart.c b/drivers/tty/serial/sirfsoc_uart.c
index 1d1c0b9857ff6900..b186c9c4f850cc16 100644
--- a/drivers/tty/serial/sirfsoc_uart.c
+++ b/drivers/tty/serial/sirfsoc_uart.c
@@ -1293,7 +1293,8 @@ static int sirfsoc_uart_probe(struct platform_device *pdev)
 	sirfport->uart_reg = (struct sirfsoc_uart_register *)match->data;
 
 	sirfport->hw_flow_ctrl =
-		of_property_read_bool(np, "sirf,uart-has-rtscts");
+		of_property_read_bool(np, "uart-has-rtscts") ||
+		of_property_read_bool(np, "sirf,uart-has-rtscts") /* deprecated */;
 	if (of_device_is_compatible(np, "sirf,prima2-uart") ||
 		of_device_is_compatible(np, "sirf,atlas7-uart"))
 		sirfport->uart_reg->uart_type = SIRF_REAL_UART;
-- 
1.9.1

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Re: [PATCH v2 5/5] serial: sirf: Use generic uart-has-rtscts DT property

[Rob Herring]

On Fri, Apr 22, 2016 at 05:22:24PM +0200, Geert Uytterhoeven wrote:
> Convert the SiRF UART driver from using the vendor-specific
> "sirf,uart-has-rtscts" to the generic "uart-has-rtscts" DT property, as
> documented by the Generic Serial DT Bindings.
> 
> The old vendor-specific property is still recognized by the driver for
> backwards compatibility, but deprecated.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>
> ---
> v2:
>   - No changes.
> 
>  Documentation/devicetree/bindings/serial/sirf-uart.txt | 8 ++++----
>  drivers/tty/serial/sirfsoc_uart.c                      | 3 ++-
>  2 files changed, 6 insertions(+), 5 deletions(-)

Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
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