* [PATCH V3 1/4] ARM: bcm2835: follow dt uart node-naming convention
[not found] ` <1453032932-2512-1-git-send-email-kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
@ 2016-01-17 12:15 ` kernel-TqfNSX0MhmxHKSADF0wUEw
[not found] ` <1453032932-2512-2-git-send-email-kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
2016-01-17 12:15 ` [PATCH V3 2/4] dt/bindings: serial: bcm2835: add binding documentation for bcm2835-aux-uart kernel-TqfNSX0MhmxHKSADF0wUEw
` (2 subsequent siblings)
3 siblings, 1 reply; 9+ messages in thread
From: kernel-TqfNSX0MhmxHKSADF0wUEw @ 2016-01-17 12:15 UTC (permalink / raw)
To: Rob Herring, Stephen Warren, Lee Jones, Eric Anholt, Russell King,
Greg Kroah-Hartman, devicetree-u79uwXL29TY76Z2rM5mHXA,
linux-rpi-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
linux-serial-u79uwXL29TY76Z2rM5mHXA
Cc: Martin Sperl
From: Martin Sperl <kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
This patch fixes the naming of the device tree node: uart@7e201000
to conform to the standard of: serial@7e201000
Signed-off-by: Martin Sperl <kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
---
arch/arm/boot/dts/bcm2835.dtsi | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/boot/dts/bcm2835.dtsi b/arch/arm/boot/dts/bcm2835.dtsi
index aef64de..b37a088 100644
--- a/arch/arm/boot/dts/bcm2835.dtsi
+++ b/arch/arm/boot/dts/bcm2835.dtsi
@@ -108,7 +108,7 @@
#interrupt-cells = <2>;
};
- uart0: uart@7e201000 {
+ uart0: serial@7e201000 {
compatible = "brcm,bcm2835-pl011", "arm,pl011", "arm,primecell";
reg = <0x7e201000 0x1000>;
interrupts = <2 25>;
--
1.7.10.4
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^ permalink raw reply related [flat|nested] 9+ messages in thread* [PATCH V3 2/4] dt/bindings: serial: bcm2835: add binding documentation for bcm2835-aux-uart
[not found] ` <1453032932-2512-1-git-send-email-kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
2016-01-17 12:15 ` [PATCH V3 1/4] ARM: bcm2835: follow dt uart node-naming convention kernel-TqfNSX0MhmxHKSADF0wUEw
@ 2016-01-17 12:15 ` kernel-TqfNSX0MhmxHKSADF0wUEw
[not found] ` <1453032932-2512-3-git-send-email-kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
2016-01-17 12:15 ` [PATCH V3 3/4] serial: bcm2835: add driver " kernel-TqfNSX0MhmxHKSADF0wUEw
2016-01-17 12:15 ` [PATCH V3 4/4] ARM: bcm2835: add bcm2835-aux-uart support to default DT kernel-TqfNSX0MhmxHKSADF0wUEw
3 siblings, 1 reply; 9+ messages in thread
From: kernel-TqfNSX0MhmxHKSADF0wUEw @ 2016-01-17 12:15 UTC (permalink / raw)
To: Rob Herring, Stephen Warren, Lee Jones, Eric Anholt, Russell King,
Greg Kroah-Hartman, devicetree-u79uwXL29TY76Z2rM5mHXA,
linux-rpi-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
linux-serial-u79uwXL29TY76Z2rM5mHXA
Cc: Martin Sperl
From: Martin Sperl <kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
Add binding documentation for the bcm2835-aux-uart driver.
Signed-off-by: Martin Sperl <kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
Changelog:
V2->V3: fixed naming convention for node
---
.../bindings/serial/brcm,bcm2835-aux-uart.txt | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
create mode 100644 Documentation/devicetree/bindings/serial/brcm,bcm2835-aux-uart.txt
diff --git a/Documentation/devicetree/bindings/serial/brcm,bcm2835-aux-uart.txt b/Documentation/devicetree/bindings/serial/brcm,bcm2835-aux-uart.txt
new file mode 100644
index 0000000..b5cc629
--- /dev/null
+++ b/Documentation/devicetree/bindings/serial/brcm,bcm2835-aux-uart.txt
@@ -0,0 +1,18 @@
+* BCM2835 AUXILIAR UART
+
+Required properties:
+
+- compatible: "brcm,bcm2835-aux-uart"
+- reg: The base address of the UART register bank.
+- interrupts: A single interrupt specifier.
+- clocks: Clock driving the hardware; used to figure out the baud rate
+ divisor.
+
+Example:
+
+ uart1: serial@7e215040 {
+ compatible = "brcm,bcm2835-aux-uart";
+ reg = <0x7e215040 0x40>;
+ interrupts = <1 29>;
+ clocks = <&aux BCM2835_AUX_CLOCK_UART>;
+ };
--
1.7.10.4
--
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^ permalink raw reply related [flat|nested] 9+ messages in thread* [PATCH V3 3/4] serial: bcm2835: add driver for bcm2835-aux-uart
[not found] ` <1453032932-2512-1-git-send-email-kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
2016-01-17 12:15 ` [PATCH V3 1/4] ARM: bcm2835: follow dt uart node-naming convention kernel-TqfNSX0MhmxHKSADF0wUEw
2016-01-17 12:15 ` [PATCH V3 2/4] dt/bindings: serial: bcm2835: add binding documentation for bcm2835-aux-uart kernel-TqfNSX0MhmxHKSADF0wUEw
@ 2016-01-17 12:15 ` kernel-TqfNSX0MhmxHKSADF0wUEw
[not found] ` <1453032932-2512-4-git-send-email-kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
2016-01-17 12:15 ` [PATCH V3 4/4] ARM: bcm2835: add bcm2835-aux-uart support to default DT kernel-TqfNSX0MhmxHKSADF0wUEw
3 siblings, 1 reply; 9+ messages in thread
From: kernel-TqfNSX0MhmxHKSADF0wUEw @ 2016-01-17 12:15 UTC (permalink / raw)
To: Rob Herring, Stephen Warren, Lee Jones, Eric Anholt, Russell King,
Greg Kroah-Hartman, devicetree-u79uwXL29TY76Z2rM5mHXA,
linux-rpi-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
linux-serial-u79uwXL29TY76Z2rM5mHXA
Cc: Martin Sperl
From: Martin Sperl <kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
The bcm2835 SOC contains an auxiliary uart, which is very close
to the ns16550 with some differences.
The big difference is that the uart HW is not using an internal divider
of 16 but 8, which results in an effictive baud-rate being twice
the requested baud-rate.
This driver handles this device correctly and handles the difference in
the HW divider by scaling up the clock by a factor of 2.
The approach to write a separate (wrapper) driver instead of using a
multiplying clock and "ns16550" as compatibility in the device-tree
has been recommended by Stephen Warren.
Signed-off-by: Martin Sperl <kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
Changelog:
V1->V2: made an explicit bcm2835-aux-uart driver
not conrolling the settings via DT only
V2->V3: added comments on UART capabilities
applied recommendations by Stefan Wahren
keep registered line-id in bcm2835aux_data
---
drivers/tty/serial/8250/8250_bcm2835aux.c | 146 +++++++++++++++++++++++++++++
drivers/tty/serial/8250/Kconfig | 24 +++++
drivers/tty/serial/8250/Makefile | 1 +
3 files changed, 171 insertions(+)
create mode 100644 drivers/tty/serial/8250/8250_bcm2835aux.c
diff --git a/drivers/tty/serial/8250/8250_bcm2835aux.c b/drivers/tty/serial/8250/8250_bcm2835aux.c
new file mode 100644
index 0000000..ecf89f1
--- /dev/null
+++ b/drivers/tty/serial/8250/8250_bcm2835aux.c
@@ -0,0 +1,146 @@
+/*
+ * Serial port driver for BCM2835AUX UART
+ *
+ * Copyright (C) 2016 Martin Sperl <kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
+ *
+ * Based on 8250_lpc18xx.c:
+ * Copyright (C) 2015 Joachim Eastwood <manabian-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+
+#include "8250.h"
+
+struct bcm2835aux_data {
+ struct uart_8250_port uart;
+ struct clk *clk;
+ int line;
+};
+
+static int bcm2835aux_serial_probe(struct platform_device *pdev)
+{
+ struct bcm2835aux_data *data;
+ struct resource *res;
+ int ret;
+
+ /* allocate the custom structure */
+ data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ /* initialize data */
+ spin_lock_init(&data->uart.port.lock);
+ data->uart.capabilities = UART_CAP_FIFO;
+ data->uart.port.dev = &pdev->dev;
+ data->uart.port.regshift = 2;
+ data->uart.port.type = PORT_16550;
+ data->uart.port.iotype = UPIO_MEM;
+ data->uart.port.fifosize = 8;
+ data->uart.port.flags = UPF_SHARE_IRQ |
+ UPF_FIXED_PORT |
+ UPF_FIXED_TYPE |
+ UPF_SKIP_TEST;
+
+ /* get the clock - this also enables the HW */
+ data->clk = devm_clk_get(&pdev->dev, NULL);
+ ret = PTR_ERR_OR_ZERO(data->clk);
+ if (ret) {
+ dev_err(&pdev->dev, "could not get clk: %d\n", ret);
+ return ret;
+ }
+
+ /* get the interrupt */
+ data->uart.port.irq = platform_get_irq(pdev, 0);
+ if (data->uart.port.irq < 0) {
+ dev_err(&pdev->dev, "irq not found - %i",
+ data->uart.port.irq);
+ return data->uart.port.irq;
+ }
+
+ /* map the main registers */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "memory resource not found");
+ return -EINVAL;
+ }
+ data->uart.port.membase = devm_ioremap_resource(&pdev->dev, res);
+ ret = PTR_ERR_OR_ZERO(data->uart.port.membase);
+ if (ret)
+ return ret;
+
+ /* Check for a fixed line number */
+ ret = of_alias_get_id(pdev->dev.of_node, "serial");
+ if (ret >= 0)
+ data->uart.port.line = ret;
+
+ /* enable the clock as a last step */
+ ret = clk_prepare_enable(data->clk);
+ if (ret) {
+ dev_err(&pdev->dev, "unable to enable uart clock - %d\n",
+ ret);
+ return ret;
+ }
+
+ /* the HW-clock divider for bcm2835aux is 8,
+ * but 8250 expects a divider of 16,
+ * so we have to multiply the actual clock by 2
+ * to get identical baudrates.
+ */
+ data->uart.port.uartclk = clk_get_rate(data->clk) * 2;
+
+ /* register the port */
+ ret = serial8250_register_8250_port(&data->uart);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "unable to register 8250 port - %d\n",
+ ret);
+ goto dis_clk;
+ }
+ data->line = ret;
+
+ platform_set_drvdata(pdev, data);
+
+ return 0;
+
+dis_clk:
+ clk_disable_unprepare(data->clk);
+ return ret;
+}
+
+static int bcm2835aux_serial_remove(struct platform_device *pdev)
+{
+ struct bcm2835aux_data *data = platform_get_drvdata(pdev);
+
+ serial8250_unregister_port(data->uart.port.line);
+ clk_disable_unprepare(data->clk);
+
+ return 0;
+}
+
+static const struct of_device_id bcm2835aux_serial_match[] = {
+ { .compatible = "brcm,bcm2835-aux-uart" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, bcm2835aux_serial_match);
+
+static struct platform_driver bcm2835aux_serial_driver = {
+ .driver = {
+ .name = "bcm2835-aux-uart",
+ .of_match_table = bcm2835aux_serial_match,
+ },
+ .probe = bcm2835aux_serial_probe,
+ .remove = bcm2835aux_serial_remove,
+};
+module_platform_driver(bcm2835aux_serial_driver);
+
+MODULE_DESCRIPTION("BCM2835 auxiliar UART driver");
+MODULE_AUTHOR("Martin Sperl <kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index 6412f14..b0a9b57 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -272,6 +272,30 @@ config SERIAL_8250_ACORN
system, say Y to this option. The driver can handle 1, 2, or 3 port
cards. If unsure, say N.
+config SERIAL_8250_BCM2835AUX
+ tristate "BCM2835 auxiliar mini UART support"
+ depends on ARCH_BCM2835 || COMPILE_TEST
+ depends on SERIAL_8250 && SERIAL_8250_SHARE_IRQ
+ help
+ Support for the BCM2835 auxiliar mini UART.
+
+ Features and limitations of the UART are
+ Registers are similar to 16650 registers,
+ set bits in the control registers that are unsupported
+ are ignored and read back as 0
+ 7/8 bit operation with 1 start and 1 stop bit
+ 8 symbols deep fifo for rx and tx
+ SW controlled RTS and SW readable CTS
+ Clock rate derived from system clock
+ Uses 8 times oversampling (compared to 16 times for 16650)
+ Missing break detection (but break generation)
+ Missing framing error detection
+ Missing parity bit
+ Missing receive time-out interrupt
+ Missing DCD, DSR, DTR and RI signals
+
+ If unsure, say N.
+
config SERIAL_8250_FSL
bool
depends on SERIAL_8250_CONSOLE
diff --git a/drivers/tty/serial/8250/Makefile b/drivers/tty/serial/8250/Makefile
index e177f86..6327d0a 100644
--- a/drivers/tty/serial/8250/Makefile
+++ b/drivers/tty/serial/8250/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_SERIAL_8250_PCI) += 8250_pci.o
obj-$(CONFIG_SERIAL_8250_HP300) += 8250_hp300.o
obj-$(CONFIG_SERIAL_8250_CS) += serial_cs.o
obj-$(CONFIG_SERIAL_8250_ACORN) += 8250_acorn.o
+obj-$(CONFIG_SERIAL_8250_BCM2835AUX) += 8250_bcm2835aux.o
obj-$(CONFIG_SERIAL_8250_CONSOLE) += 8250_early.o
obj-$(CONFIG_SERIAL_8250_FOURPORT) += 8250_fourport.o
obj-$(CONFIG_SERIAL_8250_ACCENT) += 8250_accent.o
--
1.7.10.4
--
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^ permalink raw reply related [flat|nested] 9+ messages in thread* [PATCH V3 4/4] ARM: bcm2835: add bcm2835-aux-uart support to default DT
[not found] ` <1453032932-2512-1-git-send-email-kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
` (2 preceding siblings ...)
2016-01-17 12:15 ` [PATCH V3 3/4] serial: bcm2835: add driver " kernel-TqfNSX0MhmxHKSADF0wUEw
@ 2016-01-17 12:15 ` kernel-TqfNSX0MhmxHKSADF0wUEw
3 siblings, 0 replies; 9+ messages in thread
From: kernel-TqfNSX0MhmxHKSADF0wUEw @ 2016-01-17 12:15 UTC (permalink / raw)
To: Rob Herring, Stephen Warren, Lee Jones, Eric Anholt, Russell King,
Greg Kroah-Hartman, devicetree-u79uwXL29TY76Z2rM5mHXA,
linux-rpi-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
linux-serial-u79uwXL29TY76Z2rM5mHXA
Cc: Martin Sperl
From: Martin Sperl <kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
Add bcm2835-aux-uart support to the default device tree.
Signed-off-by: Martin Sperl <kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
Note that this requires the aux-clock patches to be applied first
and it may also conflict with the still pending merge of the
rename of bcm2835.dtsi.
---
arch/arm/boot/dts/bcm2835.dtsi | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/arch/arm/boot/dts/bcm2835.dtsi b/arch/arm/boot/dts/bcm2835.dtsi
index b37a088..bfd42ae 100644
--- a/arch/arm/boot/dts/bcm2835.dtsi
+++ b/arch/arm/boot/dts/bcm2835.dtsi
@@ -149,6 +149,13 @@
status = "disabled";
};
+ uart1: serial@7e215040 {
+ compatible = "brcm,bcm2835-aux-uart";
+ reg = <0x7e215040 0x40>;
+ interrupts = <1 29>;
+ clocks = <&aux BCM2835_AUX_CLOCK_UART>;
+ };
+
sdhci: sdhci@7e300000 {
compatible = "brcm,bcm2835-sdhci";
reg = <0x7e300000 0x100>;
--
1.7.10.4
--
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^ permalink raw reply related [flat|nested] 9+ messages in thread