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Commit 52bec4ed authored by Qipan Li's avatar Qipan Li Committed by Greg Kroah-Hartman
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serial: sirf: add a new uart type support 



in CSR A7DA SoC, uart6 located at BT module and it need multiple clock
sources, so for "sirf,marco-bt-uart" compatible uarts, drivers take 3
clock sources and enable them.

this patch also replaces clk_get by devm_clk_get function and fix DT
binding document in which we missed to fix when we added marco platform
in commit 909102db "serial: sirf: add support for Marco chip".

Signed-off-by: default avatarQipan Li <Qipan.Li@csr.com>
Signed-off-by: default avatarBarry Song <Baohua.Song@csr.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e620e548

Documentation/devicetree/bindings/serial/sirf-uart.txt

+15 −1
Original line number Diff line number Diff line 
* CSR SiRFprimaII/atlasVI Universal Synchronous Asynchronous Receiver/Transmitter *



Required properties:

- compatible : Should be "sirf,prima2-uart" or "sirf, prima2-usp-uart"

- compatible : Should be "sirf,prima2-uart", "sirf, prima2-usp-uart",

		"sirf,marco-uart" or "sirf,marco-bt-uart" which means

		uart located in BT module and used for BT.

- reg : Offset and length of the register set for the device

- interrupts : Should contain uart interrupt

- fifosize : Should define hardware rx/tx fifo size
@@ -31,3 +33,15 @@ usp@b0090000 { 
	rts-gpios = <&gpio 15 0>;

	cts-gpios = <&gpio 46 0>;

};



for uart use in BT module,

uart6: uart@11000000 {

	cell-index = <6>;

	compatible = "sirf,marco-bt-uart", "sirf,marco-uart";

	reg = <0x11000000 0x1000>;

	interrupts = <0 100 0>;

	clocks = <&clks 138>, <&clks 140>, <&clks 141>;

	clock-names = "uart", "general", "noc";

	fifosize = <128>;

	status = "disabled";

}

drivers/tty/serial/sirfsoc_uart.c

+27 −7
Original line number Diff line number Diff line
@@ -1032,10 +1032,19 @@ static void sirfsoc_uart_pm(struct uart_port *port, unsigned int state, 
			      unsigned int oldstate)

{

	struct sirfsoc_uart_port *sirfport = to_sirfport(port);

	if (!state)

	if (!state) {

		if (sirfport->is_bt_uart) {

			clk_prepare_enable(sirfport->clk_noc);

			clk_prepare_enable(sirfport->clk_general);

		}

		clk_prepare_enable(sirfport->clk);

	else

	} else {

		clk_disable_unprepare(sirfport->clk);

		if (sirfport->is_bt_uart) {

			clk_disable_unprepare(sirfport->clk_general);

			clk_disable_unprepare(sirfport->clk_noc);

		}

	}

}



static int sirfsoc_uart_startup(struct uart_port *port)
@@ -1378,12 +1387,26 @@ static int sirfsoc_uart_probe(struct platform_device *pdev) 
	}

	port->irq = res->start;



	sirfport->clk = clk_get(&pdev->dev, NULL);

	sirfport->clk = devm_clk_get(&pdev->dev, NULL);

	if (IS_ERR(sirfport->clk)) {

		ret = PTR_ERR(sirfport->clk);

		goto err;

	}

	port->uartclk = clk_get_rate(sirfport->clk);

	if (of_device_is_compatible(pdev->dev.of_node, "sirf,marco-bt-uart")) {

		sirfport->clk_general = devm_clk_get(&pdev->dev, "general");

		if (IS_ERR(sirfport->clk_general)) {

			ret = PTR_ERR(sirfport->clk_general);

			goto err;

		}

		sirfport->clk_noc = devm_clk_get(&pdev->dev, "noc");

		if (IS_ERR(sirfport->clk_noc)) {

			ret = PTR_ERR(sirfport->clk_noc);

			goto err;

		}

		sirfport->is_bt_uart = true;

	} else

		sirfport->is_bt_uart = false;



	port->ops = &sirfsoc_uart_ops;

	spin_lock_init(&port->lock);
@@ -1392,7 +1415,7 @@ static int sirfsoc_uart_probe(struct platform_device *pdev) 
	ret = uart_add_one_port(&sirfsoc_uart_drv, port);

	if (ret != 0) {

		dev_err(&pdev->dev, "Cannot add UART port(%d).\n", pdev->id);

		goto port_err;

		goto err;

	}



	sirfport->rx_dma_chan = dma_request_slave_channel(port->dev, "rx");
@@ -1421,8 +1444,6 @@ static int sirfsoc_uart_probe(struct platform_device *pdev) 
				sirfport->rx_dma_items[j].xmit.buf,

				sirfport->rx_dma_items[j].dma_addr);

	dma_release_channel(sirfport->rx_dma_chan);

port_err:

	clk_put(sirfport->clk);

err:

	return ret;

}
@@ -1431,7 +1452,6 @@ static int sirfsoc_uart_remove(struct platform_device *pdev) 
{

	struct sirfsoc_uart_port *sirfport = platform_get_drvdata(pdev);

	struct uart_port *port = &sirfport->port;

	clk_put(sirfport->clk);

	uart_remove_one_port(&sirfsoc_uart_drv, port);

	if (sirfport->rx_dma_chan) {

		int i;

drivers/tty/serial/sirfsoc_uart.h

+4 −0
Original line number Diff line number Diff line
@@ -417,6 +417,10 @@ struct sirfsoc_uart_port { 


	struct uart_port		port;

	struct clk			*clk;

	/* UART6 for BT usage in A7DA platform need multi-clock source */

	bool				is_bt_uart;

	struct clk			*clk_general;

	struct clk			*clk_noc;

	/* for SiRFmarco, there are SET/CLR for UART_INT_EN */

	bool				is_marco;

	struct sirfsoc_uart_register	*uart_reg;