41d9830cd0
This adds initial and compulsory device tree support to the Gemini ARMv4 platform. We are selecting a bunch of "absolute minimals" for getting a working system up with just device tree: - We select USE_OF for natural reasons or nothing works. - We select CLKSRC_OF and GEMINI_TIMER so we get timekeeping from the clocksource. - We select GPIO_GEMINI because these are used as irqchips, and for a generic driver it is not reasonable for those to have to select every possible irqchip in the world to work, the platform should simply provide the available irqchips. - We select a UART that can be exprected to work with SERIAL_OF_PLATFORM which is the name for an 8250 OF-probed serial port. - We select the syscon-based reset controller: it's not fun when "reboot" doesn't work because of Kconfig, so we just select POWER_RESET and POWER_RESET_SYSCON. - We perhaps a bit controversiallt select ARM_APPENDED_DTB, because this platform is using the ancient RedBoot, and can *NOT* be expected to upgrade its bootloaders. Appended device tree is simply how these devices have to work with device tree. Cc: Janos Laube <janos.dev@gmail.com> Cc: Paulius Zaleckas <paulius.zaleckas@gmail.com> Cc: Hans Ulli Kroll <ulli.kroll@googlemail.com> Cc: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
39 lines
791 B
C
39 lines
791 B
C
/*
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* Gemini Device Tree boot support
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/map.h>
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#ifdef CONFIG_DEBUG_GEMINI
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/* This is needed for LL-debug/earlyprintk/debug-macro.S */
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static struct map_desc gemini_io_desc[] __initdata = {
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{
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.virtual = CONFIG_DEBUG_UART_VIRT,
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.pfn = __phys_to_pfn(CONFIG_DEBUG_UART_PHYS),
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.length = SZ_4K,
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.type = MT_DEVICE,
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},
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};
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static void __init gemini_map_io(void)
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{
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iotable_init(gemini_io_desc, ARRAY_SIZE(gemini_io_desc));
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}
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#else
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#define gemini_map_io NULL
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#endif
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static const char *gemini_board_compat[] = {
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"cortina,gemini",
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NULL,
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};
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DT_MACHINE_START(GEMINI_DT, "Gemini (Device Tree)")
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.map_io = gemini_map_io,
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.dt_compat = gemini_board_compat,
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MACHINE_END
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