On Tue, Feb 18, 2014 at 10:20:54AM -0600, Felipe Balbi wrote:
> On Fri, Jan 17, 2014 at 10:22:35AM +0100, Markus Pargmann wrote:
> > debugfs files to show the contents of important dsps registers.
> >
> > Signed-off-by: Markus Pargmann <m...@pengutronix.de>
> > ---
> > drivers/usb/musb/musb_dsps.c | 54
> > ++++++++++++++++++++++++++++++++++++++++++++
> > 1 file changed, 54 insertions(+)
> >
> > diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c
> > index 593d3c9..d0a97d6 100644
> > --- a/drivers/usb/musb/musb_dsps.c
> > +++ b/drivers/usb/musb/musb_dsps.c
> > @@ -46,6 +46,8 @@
> > #include <linux/of_irq.h>
> > #include <linux/usb/of.h>
> >
> > +#include <linux/debugfs.h>
> > +
> > #include "musb_core.h"
> >
> > static const struct of_device_id musb_dsps_of_match[];
> > @@ -137,6 +139,26 @@ struct dsps_glue {
> > unsigned long last_timer; /* last timer data for each instance */
> >
> > struct dsps_context context;
> > + struct debugfs_regset32 regset;
> > + struct dentry *dbgfs_root;
> > +};
> > +
> > +static const struct debugfs_reg32 dsps_musb_regs[] = {
> > + { "revision", 0x00 },
> > + { "control", 0x14 },
> > + { "status", 0x18 },
> > + { "eoi", 0x24 },
> > + { "intr0_stat", 0x30 },
> > + { "intr1_stat", 0x34 },
> > + { "intr0_set", 0x38 },
> > + { "intr1_set", 0x3c },
> > + { "txmode", 0x70 },
> > + { "rxmode", 0x74 },
> > + { "autoreq", 0xd0 },
> > + { "srpfixtime", 0xd4 },
> > + { "tdown", 0xd8 },
> > + { "phy_utmi", 0xe0 },
> > + { "mode", 0xe8 },
> > };
> >
> > static void dsps_musb_try_idle(struct musb *musb, unsigned long timeout)
> > @@ -369,6 +391,30 @@ out:
> > return ret;
> > }
> >
> > +static int dsps_musb_dbg_init(struct musb *musb, struct dsps_glue *glue)
> > +{
> > + struct dentry *root;
> > + struct dentry *file;
> > + char buf[128];
> > +
> > + sprintf(buf, "%s.dsps", dev_name(musb->controller));
> > + root = debugfs_create_dir(buf, NULL);
> > + if (!root)
>
> wrong, you should be using IS_ERR()
!root is fine, IS_ERR() will fail if CONFIG_DEBUGFS is not enabled.
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