linux-kernel - RE: [PATCH v9 1/1] PRUSS UIO driver support

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Date:	Fri, 4 Mar 2011 08:55:27 +0530
From:	"TK, Pratheesh Gangadhar" <pratheesh@...com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hjk@...sjkoch.de" <hjk@...sjkoch.de>,
	"gregkh@...e.de" <gregkh@...e.de>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"sshtylyov@...sta.com" <sshtylyov@...sta.com>,
	"Chatterjee, Amit" <amit.chatterjee@...com>,
	"davinci-linux-open-source@...ux.davincidsp.com" 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH v9 1/1] PRUSS UIO driver support

Hi,
> -----Original Message-----
> From: Arnd Bergmann [mailto:arnd@...db.de]
> Sent: Thursday, March 03, 2011 11:46 PM
> On Thursday 03 March 2011 19:07:57 Pratheesh Gangadhar wrote:
> > +struct uio_pruss_dev {
> > +       struct uio_info *info;
> > +       struct clk *pruss_clk;
> > +       dma_addr_t sram_paddr;
> > +       dma_addr_t ddr_paddr;
> > +       void __iomem *prussio_vaddr;
> > +       void *sram_vaddr;
> > +       void *ddr_vaddr;
> > +       unsigned int hostirq_start;
> > +       unsigned int pintc_base;
> > +};
> > +
> > +struct pruss_priv {
> > +       struct uio_pruss_dev *pupdev;
> > +};
> 
> I cannot see the point of struct pruss_priv, I think it would be better to
> just merge the two data structures into one. Everything else looks
> good to me now.

pruss_priv is needed to get access to uio_pruss_dev from uio_info *info in
UIO interrupt handler (pruss_handler) and shall be per interrupt entry.

+static irqreturn_t pruss_handler(int irq, struct uio_info *info) {
+	struct pruss_priv *priv = info->priv;
+	struct uio_pruss_dev *gdev = priv->pupdev;

Note that info is a pointer to array supporting 8 interrupts. This allows to
redirect to driver structure via info->priv quickly.

Thanks,
Pratheesh   
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