Re: [PATCH] spi: efm32: Clean up non-DT paths

["Uwe Kleine-König" <u.kleine-koenig-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>]

Hello Axel,

On Tue, Mar 11, 2014 at 06:33:03PM +0800, Axel Lin wrote:
> 2014-03-11 17:09 GMT+08:00 Uwe Kleine-König <u.kleine-koenig@pengutronix.de>:
> > On Mon, Mar 10, 2014 at 08:01:45AM +0800, Axel Lin wrote:
> >> diff --git a/drivers/spi/spi-efm32.c b/drivers/spi/spi-efm32.c
> >> index f53bbea..26e0362 100644
> >> --- a/drivers/spi/spi-efm32.c
> >> +++ b/drivers/spi/spi-efm32.c
> >> @@ -318,9 +315,14 @@ static int efm32_spi_probe(struct platform_device *pdev)
> >>       int ret;
> >>       struct spi_master *master;
> >>       struct device_node *np = pdev->dev.of_node;
> >> -     unsigned int num_cs, i;
> >> +     int num_cs, i;
> >> +
> >> +     if (!np)
> >> +             return -EINVAL;
> >>
> >>       num_cs = of_gpio_named_count(np, "cs-gpios");
> >> +     if (num_cs < 0)
> >> +             return num_cs;
> > This wasn't checked before and doesn't fit into the "cleanup non-DT
> > paths"-category. Maybe note that in the commit log?
> Ok, will update commit log in v2.
> 
> > Also did you change the type of i on purpose?
> It's a "doesn't matter" case to me.
> If you really like to keep i as unsigned int, I can leave it as
> unsigned int in v2.
I'd always use an unsigned type for it, but I don't care much.
 
> >>       master = spi_alloc_master(&pdev->dev,
> >>                       sizeof(*ddata) + num_cs * sizeof(unsigned));
> >> @@ -412,23 +414,7 @@ static int efm32_spi_probe(struct platform_device *pdev)
> >>               goto err;
> >>       }
> >>
> >> -     ret = efm32_spi_probe_dt(pdev, master, ddata);
> >> -     if (ret > 0) {
> >> -             /* not created by device tree */
> >> -             const struct efm32_spi_pdata *pdata =
> >> -                     dev_get_platdata(&pdev->dev);
> >> -
> >> -             if (pdata)
> >> -                     ddata->pdata = *pdata;
> >> -             else
> >> -                     ddata->pdata.location =
> >> -                             efm32_spi_get_configured_location(ddata);
> >> -
> >> -             master->bus_num = pdev->id;
> >> -
> >> -     } else if (ret < 0) {
> >> -             goto err_disable_clk;
> >> -     }
> >> +     efm32_spi_probe_dt(pdev, master, ddata);
> > This must still be:
> efm32_spi_probe_dt() always return 0, why *must* check the return value here?
Then also change efm32_spi_probe_dt to return void, or now that platform
device support is gone, inline it into efm32_spi_probe.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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