linux-kernel - Re: [PATCH v3 5/5] tty/serial: Add Spreadtrum sc9836-uart driver support

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Date:	Thu, 27 Nov 2014 13:57:57 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Lyra Zhang <zhang.lyra@...il.com>
Cc:	Murali Karicheri <m-karicheri2@...com>,
	Chunyan Zhang <chunyan.zhang@...eadtrum.com>,
	Grant Likely <grant.likely@...aro.org>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"jslaby@...e.cz" <jslaby@...e.cz>,
	Kumar Gala <galak@...eaurora.org>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Ramkumar Ramachandra <artagnon@...il.com>,
	"rrichter@...ium.com" <rrichter@...ium.com>,
	Will Deacon <will.deacon@....com>, gnomes@...rguk.ukuu.org.uk,
	Jonathan Corbet <corbet@....net>, jason@...edaemon.net,
	Mark Brown <broonie@...nel.org>,
	Heiko Stübner <heiko@...ech.de>,
	florian.vaussard@...l.ch, andrew@...n.ch,
	Hayato Suzuki <hytszk@...il.com>,
	Orson Zhai <orsonzhai@...il.com>,
	"geng.ren@...eadtrum.com" <geng.ren@...eadtrum.com>,
	"zhizhou.zhang" <zhizhou.zhang@...eadtrum.com>,
	lanqing.liu@...eadtrum.com,
	Wei Qiao (乔伟) <wei.qiao@...eadtrum.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"sprdlinux@...elists.org" <sprdlinux@...elists.org>,
	linux-doc@...r.kernel.org, linux-serial@...r.kernel.org,
	linux-api@...r.kernel.org
Subject: Re: [PATCH v3 5/5] tty/serial: Add Spreadtrum sc9836-uart driver support

On Thursday 27 November 2014 19:59:46 Lyra Zhang wrote:
> 2014-11-27 2:29 GMT+08:00 Murali Karicheri <m-karicheri2@...com>:
> > On 11/25/2014 07:16 AM, Chunyan Zhang wrote:
> >>
> >> Add a full sc9836-uart driver for SC9836 SoC which is based on the
> 
> >> +#include<linux/clk.h>
> >
> > How about sorting this includes? asm/irq.h go first followed linux/ in
> > alphabatical order?
> 
> >> +static irqreturn_t sprd_handle_irq(int irq, void *dev_id)
> >> +{
> >> +       struct uart_port *port = (struct uart_port *)dev_id;
> >> +       u32 ims;
> >> +
> >> +       ims = serial_in(port, SPRD_IMSR);
> >> +
> >> +       serial_out(port, SPRD_ICLR, ~0);
> >> +
> >> +       if (ims&  (SPRD_IMSR_RX_FIFO_FULL |
> >> +               SPRD_IMSR_BREAK_DETECT | SPRD_IMSR_TIMEOUT)) {
> >> +               sprd_rx(irq, port);
> >> +       }
> >> +       if (ims&  SPRD_IMSR_TX_FIFO_EMPTY)
> >> +               sprd_tx(irq, port);
> >> +
> >> +       return IRQ_HANDLED;
> >
> > You are always returning IRQ_HANDLED and this is registered as a SHARED irq.
> > Is there a chance this handler is called and the irq event doesn't
> > belong to this device?
> >
> > Murali
> 
> You are right, this is not a SHARED irq. I'll pass 0 for irqflags when
> called 'devm_request_irq' in the next version patch.

I think you could also add

	if (!ims)
		return IRQ_NONE;

which would make it work on shared interrupt lines.

	Arnd
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