| Message ID | 20220728142824.3836-2-markuss.broks@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add generic framebuffer support to EFI earlycon driver | expand |
On Thu, Jul 28, 2022 at 05:28:18PM +0300, Markuss Broks wrote: > Pass a pointer to device-tree node in case the driver probed from > OF. This makes early console drivers able to fetch options from > device-tree node properties. > > Signed-off-by: Markuss Broks <markuss.broks@gmail.com> > --- > drivers/tty/serial/earlycon.c | 3 +++ > include/linux/serial_core.h | 1 + > 2 files changed, 4 insertions(+) > > diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c > index 57c70851f22a0e78805f34d1a7700708104b6f6a..14e8a7fe54486a1c377a6659c37a73858de5bf0b 100644 > --- a/drivers/tty/serial/earlycon.c > +++ b/drivers/tty/serial/earlycon.c > @@ -304,6 +304,9 @@ int __init of_setup_earlycon(const struct earlycon_id *match, > strlcpy(early_console_dev.options, options, > sizeof(early_console_dev.options)); > } > + > + early_console_dev.node = node; > + > earlycon_init(&early_console_dev, match->name); > err = match->setup(&early_console_dev, options); > earlycon_print_info(&early_console_dev); > diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h > index cbd5070bc87f42aa450c4ca7af8a9b59fbe88574..3295721f33e482124fae8370b5889d5d6c012303 100644 > --- a/include/linux/serial_core.h > +++ b/include/linux/serial_core.h > @@ -349,6 +349,7 @@ struct earlycon_device { > struct uart_port port; > char options[16]; /* e.g., 115200n8 */ > unsigned int baud; > + unsigned long node; That should not be an unsigned long, but rather an 'int'. Something got messed up, of_setup_earlycon() should be changed to reflect this before propagating the error to other places in the kernel. And it's not really a "node" but an "offset", right? thanks, greg k-h
On Thu, Jul 28, 2022 at 4:41 PM Greg Kroah-Hartman <gregkh@linuxfoundation.org> wrote: > On Thu, Jul 28, 2022 at 05:28:18PM +0300, Markuss Broks wrote: > > Pass a pointer to device-tree node in case the driver probed from > > OF. This makes early console drivers able to fetch options from > > device-tree node properties. ... > > + unsigned long node; > > That should not be an unsigned long, but rather an 'int'. Something got > messed up, of_setup_earlycon() should be changed to reflect this before > propagating the error to other places in the kernel. It's a pointer, but what puzzles me, why it can't be declared as a such: struct device_node *node; ? > And it's not really a "node" but an "offset", right? Seems no.
On Thu, Jul 28, 2022 at 11:04:24PM +0200, Andy Shevchenko wrote: > On Thu, Jul 28, 2022 at 4:41 PM Greg Kroah-Hartman > <gregkh@linuxfoundation.org> wrote: > > On Thu, Jul 28, 2022 at 05:28:18PM +0300, Markuss Broks wrote: > > > Pass a pointer to device-tree node in case the driver probed from > > > OF. This makes early console drivers able to fetch options from > > > device-tree node properties. > > ... > > > > + unsigned long node; > > > > That should not be an unsigned long, but rather an 'int'. Something got > > messed up, of_setup_earlycon() should be changed to reflect this before > > propagating the error to other places in the kernel. > > It's a pointer, but what puzzles me, why it can't be declared as a such: > > struct device_node *node; > > ? It should not be a pointer, trace things backwards, it comes from a call to of_setup_earlycon() from early_init_dt_scan_chosen_stdout() which has offset declared as an int, and then does: if (of_setup_earlycon(match, offset, options) == 0) So why would it be a node? > > And it's not really a "node" but an "offset", right? > > Seems no. Really? What am I missing here? confused, greg k-h
On Fri, Jul 29, 2022 at 9:57 AM Greg Kroah-Hartman <gregkh@linuxfoundation.org> wrote: > On Thu, Jul 28, 2022 at 11:04:24PM +0200, Andy Shevchenko wrote: > > On Thu, Jul 28, 2022 at 4:41 PM Greg Kroah-Hartman > > <gregkh@linuxfoundation.org> wrote: > > > On Thu, Jul 28, 2022 at 05:28:18PM +0300, Markuss Broks wrote: ... > > > > + unsigned long node; > > > > > > That should not be an unsigned long, but rather an 'int'. Something got > > > messed up, of_setup_earlycon() should be changed to reflect this before > > > propagating the error to other places in the kernel. > > > > It's a pointer, but what puzzles me, why it can't be declared as a such: > > > > struct device_node *node; > > > > ? > > It should not be a pointer, trace things backwards, it comes from a call > to of_setup_earlycon() from early_init_dt_scan_chosen_stdout() which has > offset declared as an int, and then does: > if (of_setup_earlycon(match, offset, options) == 0) > > So why would it be a node? This is a very good question. > > > And it's not really a "node" but an "offset", right? > > > > Seems no. > > Really? What am I missing here? It's me who is missing something here, thanks for your elaboration! After it it becomes clear that your first question should be addressed.
diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c index 57c70851f22a0e78805f34d1a7700708104b6f6a..14e8a7fe54486a1c377a6659c37a73858de5bf0b 100644 --- a/drivers/tty/serial/earlycon.c +++ b/drivers/tty/serial/earlycon.c @@ -304,6 +304,9 @@ int __init of_setup_earlycon(const struct earlycon_id *match, strlcpy(early_console_dev.options, options, sizeof(early_console_dev.options)); } + + early_console_dev.node = node; + earlycon_init(&early_console_dev, match->name); err = match->setup(&early_console_dev, options); earlycon_print_info(&early_console_dev); diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index cbd5070bc87f42aa450c4ca7af8a9b59fbe88574..3295721f33e482124fae8370b5889d5d6c012303 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -349,6 +349,7 @@ struct earlycon_device { struct uart_port port; char options[16]; /* e.g., 115200n8 */ unsigned int baud; + unsigned long node; }; struct earlycon_id {
Pass a pointer to device-tree node in case the driver probed from OF. This makes early console drivers able to fetch options from device-tree node properties. Signed-off-by: Markuss Broks <markuss.broks@gmail.com> --- drivers/tty/serial/earlycon.c | 3 +++ include/linux/serial_core.h | 1 + 2 files changed, 4 insertions(+)