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Date: Mon, 5 Jan 2015 17:00:36 +0530 From: Vineet Gupta <Vineet.Gupta1@...opsys.com> To: <gregkh@...uxfoundation.org> CC: <linux-serial@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <robh@...nel.org>, <jslaby@...e.cz>, Vineet Gupta <Vineet.Gupta1@...opsys.com>, Arnd Bergmann <arnd@...db.de> Subject: [PATCH v2 2/3] serial: 8250_early: prepare for dynamic BASE_BAUD BASE_BAUD is pain in neck for multi-platform support as it hard codes at build time the clk value for early uart. Mitigate this by allowing arches/platforms to provide their own version which can do dynamic setup based on DT values etc (see next patch for usage) This was needed for ARC SDP platforms based on 2 different FPGA flows, each with a different UART clk value. Signed-off-by: Vineet Gupta <vgupta@...opsys.com> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Cc: Jiri Slaby <jslaby@...e.cz> Cc: linux-serial@...r.kernel.org Cc: linux-kernel@...r.kernel.org Cc: Rob Herring <robh@...nel.org> Cc: Arnd Bergmann <arnd@...db.de> --- drivers/tty/serial/earlycon.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c index 64fe25a4285c..bfd3537739e0 100644 --- a/drivers/tty/serial/earlycon.c +++ b/drivers/tty/serial/earlycon.c @@ -54,6 +54,15 @@ static void __iomem * __init earlycon_map(unsigned long paddr, size_t size) return base; } +unsigned int __weak __init earlycon_base_baud(char *options) +{ +#ifdef BASE_BAUD + return BASE_BAUD; +#else + return 1843200/16; /* x86 early console */ +#endif +} + static int __init parse_options(struct earlycon_device *device, char *options) { @@ -87,7 +96,7 @@ static int __init parse_options(struct earlycon_device *device, return -EINVAL; } - port->uartclk = BASE_BAUD * 16; + port->uartclk = earlycon_base_baud(options) * 16; options = strchr(options, ','); if (options) { @@ -156,7 +165,7 @@ int __init of_setup_earlycon(unsigned long addr, port->iotype = UPIO_MEM; port->mapbase = addr; - port->uartclk = BASE_BAUD * 16; + port->uartclk = earlycon_base_baud(NULL) * 16; port->membase = earlycon_map(addr, SZ_4K); early_console_dev.con->data = &early_console_dev; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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