On 11/10/2014 11:42 AM, Stephen Boyd wrote: > On 11/10/2014 10:54 AM, Kevin Hilman wrote: >> On Wed, Oct 22, 2014 at 5:33 PM, Stephen Boyd <sboyd@xxxxxxxxxxxxxx> wrote: >>> We rely on probe order of this driver to determine the line number for >>> the uart port. This makes it impossible to know the line number >>> when these devices are populated via DT. Use the DT alias >>> mechanism to assign the line based on the aliases node. >>> >>> Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx> >> FYI... this patch hit linux-next and caused multiple boot failures on >> qcom platforms[1] as of next-20141110. I'm assuming this is because >> the corresponding DTS changes have not hit linux-next yet. >> >> Kevin >> >> [1] http://status.armcloud.us/boot/?qcom > > Hmm the intention was to make it optional so that dts changes aren't > necessary unless you want deterministic numbering. I screwed that up > badly :/ Thanks for finding this. > > Greg, can you also apply this patch or squash it into the bad one? > > ----8<----- > > From: Stephen Boyd <sboyd@xxxxxxxxxxxxxx> > Subject: [PATCH] tty: serial: msm_serial: Don't required DT aliases > > If there isn't a DT alias then of_alias_get_id() will return > -ENODEV. This will cause the msm_serial driver to fail probe, > when we want to keep the previous behavior where we generated a > dynamic line number at probe time. Restore this behavior by > generating a dynamic id if the line number is still negative > after checking for an alias or (in the non-DT case) looking at the > .id field of the platform device. > > Reported-by: Kevin Hilman <khilman@xxxxxxxxxx> > Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx> > --- > drivers/tty/serial/msm_serial.c | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) > > diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c > index 09364dd8cf3a..d1bc6b6cbc70 100644 > --- a/drivers/tty/serial/msm_serial.c > +++ b/drivers/tty/serial/msm_serial.c > @@ -1046,14 +1046,14 @@ static int msm_serial_probe(struct platform_device *pdev) > const struct of_device_id *id; > int irq, line; > > - if (pdev->id == -1) > - pdev->id = atomic_inc_return(&msm_uart_next_id) - 1; > - > if (pdev->dev.of_node) > line = of_alias_get_id(pdev->dev.of_node, "serial"); > else > line = pdev->id; > > + if (line < 0) > + line = atomic_inc_return(&msm_uart_next_id) - 1; > + > if (unlikely(line < 0 || line >= UART_NR)) Then this original check for "line < 0" can also be removed. > return -ENXIO; > > -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
