linux-kernel - Re: [PATCH 01/10] serial: mvebu-uart: initial support for Armada-3700 serial port

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Date:	Wed, 03 Feb 2016 17:43:59 +0100
From:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
To:	Marcin Wojtas <mw@...ihalf.com>
Cc:	Jason Cooper <jason@...edaemon.net>, Andrew Lunn <andrew@...n.ch>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	arm@...nel.org, Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Jonathan Corbet <corbet@....net>,
	Mark Rutland <mark.rutland@....com>,
	"devicetree\@vger.kernel.org" <devicetree@...r.kernel.org>,
	linux-ide@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, Nadav Haklai <nadavh@...vell.com>,
	Hans de Goede <hdegoede@...hat.com>,
	linux-serial@...r.kernel.org, Jiri Slaby <jslaby@...e.com>,
	Tejun Heo <tj@...nel.org>, Wilson Ding <dingwei@...vell.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	"linux-arm-kernel\@lists.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 01/10] serial: mvebu-uart: initial support for Armada-3700 serial port

Hi Marcin,
 
 On mer., févr. 03 2016, Marcin Wojtas <mw@...ihalf.com> wrote:

> Hi Gregory
>
>> +
>> +static int mvebu_uart_startup(struct uart_port *port)
>> +{
>> +       int ret;
>> +
>> +       writel(CTRL_TXFIFO_RST | CTRL_RXFIFO_RST,
>> +              port->membase + UART_CTRL);
>> +       udelay(1);
>> +       writel(CTRL_RX_INT, port->membase + UART_CTRL);
>> +
>> +       ret = request_irq(port->irq, mvebu_uart_isr, port->irqflags, "serial",
>> +                         port);
>> +       if (ret) {
>> +               dev_err(port->dev, "failed to request irq\n");
>> +               return ret;
>> +       }
>> +
>> +       return 0;
>> +}
>> +
>
>> +static int mvebu_uart_probe(struct platform_device *pdev)
>> +{
>> +       struct resource *reg = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +       struct resource *irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
>> +       struct uart_port *port;
>> +       struct mvebu_uart_data *data;
>> +       int ret;
>> +
>> +       if (!reg || !irq) {
>> +               dev_err(&pdev->dev, "no registers/irq defined\n");
>> +               return -EINVAL;
>> +       }
>> +
>> +       port = &mvebu_uart_ports[0];
>> +
>> +       spin_lock_init(&port->lock);
>> +
>> +       port->dev        = &pdev->dev;
>> +       port->type       = PORT_MVEBU;
>> +       port->ops        = &mvebu_uart_ops;
>> +       port->regshift   = 0;
>> +
>> +       port->fifosize   = 32;
>> +       port->iotype     = UPIO_MEM32;
>> +       port->flags      = UPF_FIXED_PORT;
>> +       port->line       = 0; /* single port: force line number to  0 */
>> +
>> +       port->irq        = irq->start;
>> +       port->irqflags   = 0;
>
> Please use port->irqflags = IRQF_SHARED;
> As ubuntu opens multiple consoles A3700 can't boot to it (only to
> buildroot with single console).

But this irq is not shared, this looks like a hack hidding the real
issue.

Gregory

>
> Best regards,
> Marcin

-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com