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Commit 85c99690 authored by Alexander Shiyan's avatar Alexander Shiyan Committed by Greg Kroah-Hartman
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serial: sccnxp: Add DT support 



Add DT support to the SCCNCP serial driver.

Signed-off-by: default avatarAlexander Shiyan <shc_work@mail.ru>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ea4c39be

Documentation/devicetree/bindings/tty/serial/sccnxp-serial.txt

0 → 100644
+53 −0
Original line number Diff line number Diff line 
* NXP (Philips) SCC+++(SCN+++) serial driver



Required properties:

- compatible: Should be "nxp,<ictype>". The supported ICs include sc2681,

  sc2691, sc2692, sc2891, sc2892, sc28202, sc68681 and sc68692.

- reg: Address and length of the register set for the device.

- interrupts: Should contain the interrupt number. If omitted,

  polling mode will be used instead, so "poll-interval" property should

  be populated in this case.



Optional properties:

- clocks: Phandle to input clock. If omitted, default IC frequency will be

  used instead.

- poll-interval: Poll interval time in nanoseconds.

- vcc-supply: The regulator supplying the VCC to drive the chip.

- nxp,sccnxp-io-cfg: Array contains values for the emulated modem signals.

  The number of values depends on the UART-number in the selected chip.

  Each value should be composed according to the following rules:

  (LINE1 << SIGNAL1) | ... | (LINEX << SIGNALX), where:

   LINE - VALUE:

    OP0 - 1

    OP1 - 2

    OP2 - 3

    OP3 - 4

    OP4 - 5

    OP5 - 6

    OP6 - 7

    OP7 - 8

    IP0 - 9

    IP1 - 10

    IP2 - 11

    IP3 - 12

    IP4 - 13

    IP5 - 14

    IP6 - 15

   SIGNAL - VALUE:

    DTR - 0

    RTS - 4

    DSR - 8

    CTS - 12

    DCD - 16

    RNG - 20

    DIR - 24



Example (Dual UART with direction control on OP0 & OP1):

sc2892@10100000 {

	compatible = "nxp,sc2892";

	reg = <0x10100000 0x10>;

	poll-interval = <10000>;

	clocks = <&sc2892_clk>;

	vcc-supply = <&sc2892_reg>;

	nxp,sccnxp-io-cfg = <0x01000000 0x02000000>;

};

drivers/tty/serial/sccnxp.c

+37 −9
Original line number Diff line number Diff line
@@ -20,6 +20,8 @@ 
#include <linux/module.h>

#include <linux/device.h>

#include <linux/console.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/serial_core.h>

#include <linux/serial.h>

#include <linux/io.h>
@@ -853,10 +855,25 @@ static const struct platform_device_id sccnxp_id_table[] = { 
};

MODULE_DEVICE_TABLE(platform, sccnxp_id_table);



static const struct of_device_id sccnxp_dt_id_table[] = {

	{ .compatible = "nxp,sc2681",	.data = &sc2681, },

	{ .compatible = "nxp,sc2691",	.data = &sc2691, },

	{ .compatible = "nxp,sc2692",	.data = &sc2692, },

	{ .compatible = "nxp,sc2891",	.data = &sc2891, },

	{ .compatible = "nxp,sc2892",	.data = &sc2892, },

	{ .compatible = "nxp,sc28202",	.data = &sc28202, },

	{ .compatible = "nxp,sc68681",	.data = &sc68681, },

	{ .compatible = "nxp,sc68692",	.data = &sc68692, },

	{ }

};

MODULE_DEVICE_TABLE(of, sccnxp_dt_id_table);



static int sccnxp_probe(struct platform_device *pdev)

{

	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	struct sccnxp_pdata *pdata = dev_get_platdata(&pdev->dev);

	const struct of_device_id *of_id =

		of_match_device(sccnxp_dt_id_table, &pdev->dev);

	int i, ret, uartclk;

	struct sccnxp_port *s;

	void __iomem *membase;
@@ -875,8 +892,23 @@ static int sccnxp_probe(struct platform_device *pdev) 


	spin_lock_init(&s->lock);



	if (of_id) {

		s->chip = (struct sccnxp_chip *)of_id->data;



		of_property_read_u32(pdev->dev.of_node, "poll-interval",

				     &s->pdata.poll_time_us);

		of_property_read_u32(pdev->dev.of_node, "reg-shift",

				     &s->pdata.reg_shift);

		of_property_read_u32_array(pdev->dev.of_node,

					   "nxp,sccnxp-io-cfg",

					   s->pdata.mctrl_cfg, s->chip->nr);

	} else {

		s->chip = (struct sccnxp_chip *)pdev->id_entry->driver_data;



		if (pdata)

			memcpy(&s->pdata, pdata, sizeof(struct sccnxp_pdata));

	}



	s->regulator = devm_regulator_get(&pdev->dev, "vcc");

	if (!IS_ERR(s->regulator)) {

		ret = regulator_enable(s->regulator);
@@ -906,16 +938,11 @@ static int sccnxp_probe(struct platform_device *pdev) 
		goto err_out;

	}



	if (pdata)

		memcpy(&s->pdata, pdata, sizeof(struct sccnxp_pdata));



	if (s->pdata.poll_time_us) {

		dev_info(&pdev->dev, "Using poll mode, resolution %u usecs\n",

			 s->pdata.poll_time_us);

		s->poll = 1;

	}



	if (!s->poll) {

	} else {

		s->irq = platform_get_irq(pdev, 0);

		if (s->irq < 0) {

			dev_err(&pdev->dev, "Missing irq resource data\n");
@@ -1018,6 +1045,7 @@ static struct platform_driver sccnxp_uart_driver = { 
	.driver = {

		.name		= SCCNXP_NAME,

		.owner		= THIS_MODULE,

		.of_match_table	= sccnxp_dt_id_table,

	},

	.probe		= sccnxp_probe,

	.remove		= sccnxp_remove,

include/linux/platform_data/serial-sccnxp.h

+3 −3
Original line number Diff line number Diff line
@@ -78,11 +78,11 @@ 
/* SCCNXP platform data structure */

struct sccnxp_pdata {

	/* Shift for A0 line */

	const u8		reg_shift;

	u32	reg_shift;

	/* Modem control lines configuration */

	const u32		mctrl_cfg[SCCNXP_MAX_UARTS];

	u32	mctrl_cfg[SCCNXP_MAX_UARTS];

	/* Timer value for polling mode (usecs) */

	const unsigned int	poll_time_us;

	u32	poll_time_us;

};



#endif