If an earlycon (stdout-path) node is being used, check for "big-endian" or "native-endian" properties and pass the appropriate iotype to the driver. Note that LE sets UPIO_MEM (8-bit) but BE sets UPIO_MEM32BE (32-bit). The big-endian property only really makes sense in the context of 32-bit registers, since 8-bit accesses never require data swapping. At some point, the of_earlycon code may want to pass in the reg-io-width, reg-offset, and reg-shift parameters too. Signed-off-by: Kevin Cernekee <cernekee@xxxxxxxxx> --- drivers/of/fdt.c | 7 ++++++- drivers/tty/serial/earlycon.c | 4 ++-- include/linux/serial_core.h | 2 +- 3 files changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index 658656f..9d21472 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -794,6 +794,8 @@ int __init early_init_dt_scan_chosen_serial(void) while (match->compatible[0]) { unsigned long addr; + unsigned char iotype = UPIO_MEM; + if (fdt_node_check_compatible(fdt, offset, match->compatible)) { match++; continue; @@ -803,7 +805,10 @@ int __init early_init_dt_scan_chosen_serial(void) if (!addr) return -ENXIO; - of_setup_earlycon(addr, match->data); + if (of_fdt_is_big_endian(fdt, offset)) + iotype = UPIO_MEM32BE; + + of_setup_earlycon(addr, iotype, match->data); return 0; } return -ENODEV; diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c index a514ee6..548f7d7 100644 --- a/drivers/tty/serial/earlycon.c +++ b/drivers/tty/serial/earlycon.c @@ -148,13 +148,13 @@ int __init setup_earlycon(char *buf, const char *match, return 0; } -int __init of_setup_earlycon(unsigned long addr, +int __init of_setup_earlycon(unsigned long addr, unsigned char iotype, int (*setup)(struct earlycon_device *, const char *)) { int err; struct uart_port *port = &early_console_dev.port; - port->iotype = UPIO_MEM; + port->iotype = iotype; port->mapbase = addr; port->uartclk = BASE_BAUD * 16; port->membase = earlycon_map(addr, SZ_4K); diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index d2d5bf6..0d60c64 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -310,7 +310,7 @@ struct earlycon_device { int setup_earlycon(char *buf, const char *match, int (*setup)(struct earlycon_device *, const char *)); -extern int of_setup_earlycon(unsigned long addr, +extern int of_setup_earlycon(unsigned long addr, unsigned char iotype, int (*setup)(struct earlycon_device *, const char *)); #define EARLYCON_DECLARE(name, func) \ -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html