linux-kernel - Re: [PATCH V2 45/69] ST SPEAr: PCIE gadget suppport

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Date:	Thu, 21 Oct 2010 10:25:34 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Pratyush ANAND <pratyush.anand@...com>
Cc:	Viresh KUMAR <viresh.kumar@...com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"rtc-linux@...glegroups.com" <rtc-linux@...glegroups.com>,
	"a.zummo@...ertech.it" <a.zummo@...ertech.it>,
	"dbrownell@...rs.sourceforge.net" <dbrownell@...rs.sourceforge.net>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"dmitry.torokhov@...il.com" <dmitry.torokhov@...il.com>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Shiraz HASHIM <shiraz.hashim@...com>,
	Vipin KUMAR <vipin.kumar@...com>,
	Deepak SIKRI <deepak.sikri@...com>,
	Armando VISCONTI <armando.visconti@...com>,
	Vipul Kumar SAMAR <vipulkumar.samar@...com>,
	Rajeev KUMAR <rajeev-dlh.kumar@...com>,
	Bhupesh SHARMA <bhupesh.sharma@...com>
Subject: Re: [PATCH V2 45/69] ST SPEAr: PCIE gadget suppport

On Thu, 21 Oct 2010 22:18:28 +0800 Pratyush ANAND <pratyush.anand@...com> wrote:

> > > +static ssize_t pcie_gadget_show_help(struct device *dev,
> > > +           struct device_attribute *attr, char *buf)
> > > +{
> > > +   char text[] = "\t\tlink read->ltssm status\n \
> > > +           link write->arg1 = UP to enable ltsmm DOWN to disable\n \
> > > +           int_type read->type of supported interrupt\n \
> > > +           int_type write->arg1 = interrupt type to be configured and\n \
> > > +           can be INTA, MSI or NO_INT\n \
> > > +           (select MSI only when you have programmed no_of_msi)\n \
> > > +           no_of_msi read->zero if MSI is not enabled by host\n \
> > > +           and positive value is the number of MSI vector granted\n \
> > > +           no_of_msi write->arg1 = number of MSI vector needed\n \
> > > +           inta write->arg1 = 1 to assert INTA and 0 to de-assert\n \
> > > +           send_msi write->arg1 = MSI vector to be send\n \
> > > +           vendor_id read->programmed vendor id (hex)\n\
> > > +           vendor_id write->arg1 = vendor id(hex) to be programmed\n \
> > > +           device_id read->programmed device id(hex)\n \
> > > +           device_id write->arg1 = device id(hex) to be programmed\n \
> > > +           bar0_size read->size of bar0 in hex\n \
> > > +           bar0_size write->arg1= size of bar0 in hex\n \
> > > +           (default bar0 size is 1000 (hex) bytes)\n \
> > > +           bar0_address read->address of bar0 mapped area in hex\n \
> > > +           bar0_address write->arg1 = address of bar0 mapped area in
> > hex\n\
> > > +           (default mapping of bar0 is SYSRAM1(E0800000)\n \
> > > +           (always program bar size before bar address)\n \
> > > +           (kernel might modify bar size and address to align)\n \
> > > +           (read back bar size and address after writing to check)\n \
> > > +           bar0_rw_offset read->offset of bar0 for which bar0_data \n \
> > > +           will return value\n \
> > > +           bar0_rw_offset write->arg1 = offset of bar0 for which\n \
> > > +           bar0_data will write value\n \
> > > +           bar0_data read->data at bar0_rw_offset\n \
> > > +           bar0_data write->arg1 = data to be written at\n \
> > > +           bar0_rw_offset\n";
> > > +
> > > +   int size = (sizeof(text) < PAGE_SIZE) ? sizeof(text) : PAGE_SIZE;
> > > +
> > > +   return snprintf(buf, size, "%s", text);
> > > +}
> >
> > What the heck is this??
> >
> 
> This was just to provide help for different sysfs nodes. What could be the other
> Way to do it? Should it be better to remove help node from here provide all the help
> In a separate document?

Yes, documenting it externally would be more typical.

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