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serial/arc-uart: switch to devicetree based probing
* DT binding for arc-uart * With alll the bits in place we can now use DT probing. Note that there's a bit of kludge right now because earlyprintk portion of driver can't use the DT infrastrcuture to get resoures/plat_data. This requires some infrastructre changes to of_flat_ framework Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Grant Likely <grant.likely@secretlab.ca> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Alan Cox <alan@linux.intel.com> Cc: devicetree-discuss@lists.ozlabs.org Cc: Rob Herring <rob.herring@calxeda.com> Cc: Rob Landley <rob@landley.net> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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26
Documentation/devicetree/bindings/tty/serial/arc-uart.txt
Normal file
26
Documentation/devicetree/bindings/tty/serial/arc-uart.txt
Normal file
@ -0,0 +1,26 @@
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* Synopsys ARC UART : Non standard UART used in some of the ARC FPGA boards
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Required properties:
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- compatible : "snps,arc-uart"
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- reg : offset and length of the register set for the device.
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- interrupts : device interrupt
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- clock-frequency : the input clock frequency for the UART
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- baud : baud rate for UART
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e.g.
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arcuart0: serial@c0fc1000 {
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compatible = "snps,arc-uart";
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reg = <0xc0fc1000 0x100>;
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interrupts = <5>;
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clock-frequency = <80000000>;
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baud = <115200>;
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status = "okay";
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};
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Note: Each port should have an alias correctly numbered in "aliases" node.
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e.g.
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aliases {
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serial0 = &arcuart0;
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};
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@ -37,6 +37,8 @@
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#include <linux/tty_flip.h>
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#include <linux/serial_core.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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/*************************************
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* ARC UART Hardware Specs
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@ -537,8 +539,26 @@ arc_uart_init_one(struct platform_device *pdev, int dev_id)
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return -ENODEV;
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uart->is_emulated = !!plat_data[0]; /* workaround ISS bug */
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uart->port.uartclk = plat_data[1];
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uart->baud = plat_data[2];
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if (is_early_platform_device(pdev)) {
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uart->port.uartclk = plat_data[1];
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uart->baud = plat_data[2];
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} else {
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struct device_node *np = pdev->dev.of_node;
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u32 val;
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if (of_property_read_u32(np, "clock-frequency", &val)) {
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dev_err(&pdev->dev, "clock-frequency property NOTset\n");
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return -EINVAL;
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}
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uart->port.uartclk = val;
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if (of_property_read_u32(np, "baud", &val)) {
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dev_err(&pdev->dev, "baud property NOT set\n");
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return -EINVAL;
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}
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uart->baud = val;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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@ -673,8 +693,18 @@ static int __init arc_serial_probe_earlyprintk(struct platform_device *pdev)
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static int arc_serial_probe(struct platform_device *pdev)
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{
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int rc, dev_id;
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struct device_node *np = pdev->dev.of_node;
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/* no device tree device */
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if (!np)
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return -ENODEV;
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dev_id = of_alias_get_id(np, "serial");
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if (dev_id < 0) {
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dev_err(&pdev->dev, "failed to get alias id: %d\n", dev_id);
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return dev_id;
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}
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dev_id = pdev->id < 0 ? 0 : pdev->id;
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rc = arc_uart_init_one(pdev, dev_id);
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if (rc)
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return rc;
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@ -689,12 +719,19 @@ static int arc_serial_remove(struct platform_device *pdev)
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return 0;
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}
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static const struct of_device_id arc_uart_dt_ids[] = {
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{ .compatible = "snps,arc-uart" },
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{ /* Sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, arc_uart_dt_ids);
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static struct platform_driver arc_platform_driver = {
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.probe = arc_serial_probe,
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.remove = arc_serial_remove,
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.driver = {
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.name = DRIVER_NAME,
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.owner = THIS_MODULE,
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.of_match_table = arc_uart_dt_ids,
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},
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};
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