Re: [PATCH v11 10/10] tty: serial: Add Nuvoton ma35d1 serial driver support

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On 16. 05. 23, 9:52, Jacky Huang wrote:
+static void ma35d1serial_config_port(struct uart_port *port, int flags)
+{
+	/*
+	 * Driver core for serial ports forces a non-zero value for port type.
+	 * Write an arbitrary value here to accommodate the serial core driver,
+	 * as ID part of UAPI is redundant.
+	 */
+	port->type = 1;

So this 1 translates to PORT_8250. Why not to use it directly? Or something more saner like PORT_16550A?

+}
+
+static int ma35d1serial_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+	if (port->type != PORT_UNKNOWN && ser->type != 1)
+		return -EINVAL;
+
+	return 0;
+}
...
+static int __init ma35d1serial_console_setup(struct console *co, char *options)
+{
+	struct device_node *np = ma35d1serial_uart_nodes[co->index];
+	struct uart_ma35d1_port *p = &ma35d1serial_ports[co->index];
+	u32 val32[4];
+	struct uart_port *port;
+	int baud = 115200;
+	int bits = 8;
+	int parity = 'n';
+	int flow = 'n';
+
+	/*
+	 * Check whether an invalid uart number has been specified, and

You dereferenced ma35d1serial_uart_nodes already. Doesn't console=ttyNVT1000 (or something like that) crash the system?

+	 * if so, search for the first available port that does have
+	 * console support.

The code below doesn't match this comment.

+	 */
+	if ((co->index < 0) || (co->index >= MA35_UART_NR)) {
+		pr_debug("Console Port%x out of range\n", co->index);
+		return -EINVAL;
+	}
+
+	if (of_property_read_u32_array(np, "reg", val32, 4) != 0)

Shouldn't that 4 be ARRAY_SIZE(val32) instead?

+		return -EINVAL;

One \n here please.

+	p->port.iobase = val32[1];
+	p->port.membase = ioremap(p->port.iobase, MA35_UART_REG_SIZE);

What if this fails?

+	p->port.ops = &ma35d1serial_ops;
+	p->port.line = 0;
+	p->port.uartclk = MA35_UART_CONSOLE_CLK;
+
+	port = &ma35d1serial_ports[co->index].port;

Isn't this:
  port = &p->port;
?

Either use port on all above lines or drop the "port" variable completely and use "p->port" below instead.

+
+	if (options)
+		uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+	return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+static struct console ma35d1serial_console = {
+	.name    = "ttyNVT",
+	.write   = ma35d1serial_console_write,
+	.device  = uart_console_device,
+	.setup   = ma35d1serial_console_setup,
+	.flags   = CON_PRINTBUFFER | CON_ENABLED,
+	.index   = -1,
+	.data    = &ma35d1serial_reg,

I don't see console->data used anywhere in the driver?

+};
...
+static int ma35d1serial_probe(struct platform_device *pdev)
+{
+	struct resource *res_mem;
+	struct uart_ma35d1_port *up;
+	int ret = 0;
+
+	if (pdev->dev.of_node) {
+		ret = of_alias_get_id(pdev->dev.of_node, "serial");
+		if (ret < 0) {
+			dev_err(&pdev->dev, "failed to get alias/pdev id, errno %d\n", ret);
+			return ret;
+		}
+	}
+	up = &ma35d1serial_ports[ret];
+	up->port.line = ret;
+	res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res_mem)
+		return -ENODEV;
+
+	up->port.iobase = res_mem->start;
+	up->port.membase = ioremap(up->port.iobase, MA35_UART_REG_SIZE);

Check this too.

+	up->port.ops = &ma35d1serial_ops;
+
+	spin_lock_init(&up->port.lock);
+
+	up->clk = of_clk_get(pdev->dev.of_node, 0);
+	if (IS_ERR(up->clk)) {
+		ret = PTR_ERR(up->clk);
+		dev_err(&pdev->dev, "failed to get core clk: %d\n", ret);
+		goto err_iounmap;
+	}
+
+	ret = clk_prepare_enable(up->clk);
+	if (ret)
+		goto err_iounmap;
+
+	if (up->port.line != 0)
+		up->port.uartclk = clk_get_rate(up->clk);
+
+	ret = platform_get_irq(pdev, 0);
+	if (ret < 0)
+		goto err_clk_disable;
+
+	up->port.irq = ret;
+	up->port.dev = &pdev->dev;
+	up->port.flags = UPF_BOOT_AUTOCONF;
+
+	platform_set_drvdata(pdev, up);
+
+	ret = uart_add_one_port(&ma35d1serial_reg, &up->port);
+	if (ret < 0)
+		goto err_free_irq;
+
+	return 0;
+
+err_free_irq:
+	free_irq(up->port.irq, &up->port);
+
+err_clk_disable:
+	clk_disable_unprepare(up->clk);
+
+err_iounmap:
+	iounmap(up->port.membase);
+	return ret;
+}

thanks,
--
js
suse labs




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