On Wed, Mar 4, 2015 at 11:24 AM, Peter Hurley <peter@xxxxxxxxxxxxxxxxxx> wrote:
> Read the optional "reg-offset", "reg-shift" and "reg-io-width" properties
> and initialize the respective struct uart_port field if found.
>
> NB: These bindings are common to several drivers and the values merely
> indicate the default value; the registering earlycon setup() method can
> simply override the values if required.
>
> Signed-off-by: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
Acked-by: Rob Herring <robh@xxxxxxxxxx>
> ---
> drivers/of/fdt.c | 2 +-
> drivers/tty/serial/earlycon.c | 27 +++++++++++++++++++++++++++
> include/linux/serial_core.h | 1 +
> 3 files changed, 29 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> index bdb74a8..a732890 100644
> --- a/drivers/of/fdt.c
> +++ b/drivers/of/fdt.c
> @@ -802,7 +802,7 @@ int __init early_init_dt_scan_chosen_serial(void)
> if (!addr)
> return -ENXIO;
>
> - of_setup_earlycon(addr, match, options);
> + of_setup_earlycon(addr, match, offset, options);
> return 0;
> }
> return -ENODEV;
> diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
> index 436ac88..019010f 100644
> --- a/drivers/tty/serial/earlycon.c
> +++ b/drivers/tty/serial/earlycon.c
> @@ -21,6 +21,10 @@
> #include <linux/sizes.h>
> #include <linux/mod_devicetable.h>
>
> +#ifdef CONFIG_OF_EARLY_FLATTREE
> +#include <linux/of_fdt.h>
> +#endif
> +
> #ifdef CONFIG_FIX_EARLYCON_MEM
> #include <asm/fixmap.h>
> #endif
> @@ -219,17 +223,40 @@ early_param("earlycon", param_setup_earlycon);
>
> int __init of_setup_earlycon(unsigned long addr,
> const struct of_device_id *match,
> + unsigned long node,
> const char *options)
> {
> int err;
> struct uart_port *port = &early_console_dev.port;
> int (*setup)(struct earlycon_device *, const char *) = match->data;
> + const __be32 *val;
>
> port->iotype = UPIO_MEM;
> port->mapbase = addr;
> port->uartclk = BASE_BAUD * 16;
> port->membase = earlycon_map(addr, SZ_4K);
>
> + val = of_get_flat_dt_prop(node, "reg-offset", NULL);
> + if (val)
> + port->mapbase += be32_to_cpu(*val);
> + val = of_get_flat_dt_prop(node, "reg-shift", NULL);
> + if (val)
> + port->regshift = be32_to_cpu(*val);
> + val = of_get_flat_dt_prop(node, "reg-io-width", NULL);
> + if (val) {
> + switch (be32_to_cpu(*val)) {
> + case 1:
> + port->iotype = UPIO_MEM;
> + break;
> + case 4:
> + port->iotype = UPIO_MEM32;
> + break;
> + default:
> + pr_warn("[%s] unsupported reg-io-width\n", match->name);
> + return -EINVAL;
> + }
> + }
> +
> if (options) {
> strlcpy(early_console_dev.options, options,
> sizeof(early_console_dev.options));
> diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
> index ebbcd43..c8e4e8f 100644
> --- a/include/linux/serial_core.h
> +++ b/include/linux/serial_core.h
> @@ -347,6 +347,7 @@ struct earlycon_id {
> extern int setup_earlycon(char *buf);
> extern int of_setup_earlycon(unsigned long addr,
> const struct of_device_id *match,
> + unsigned long node,
> const char *options);
>
> #define EARLYCON_DECLARE(_name, func) \
> --
> 2.3.1
>
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