diff options
author | Chen-Yu Tsai <wens@csie.org> | 2015-12-05 16:16:42 +0300 |
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committer | Maxime Ripard <maxime.ripard@free-electrons.com> | 2015-12-07 11:58:17 +0300 |
commit | 6d3a47c29186aa8d26ff05a6209c94291ace0696 (patch) | |
tree | 74c04bf95a70c2ea1c04aa55e1af2c1595500e02 /drivers/clk/sunxi/clk-simple-gates.c | |
parent | 77d16e2c66c86afc0130822b816ae26790a241fb (diff) | |
download | linux-6d3a47c29186aa8d26ff05a6209c94291ace0696.tar.xz |
clk: sunxi: Add DRAM gates support for sun4i-a10
The A10/A20 share the same set of DRAM clock gates, which controls
direct memory access for some peripherals.
On the A10, bit 15 controls the system's DRAM clock output (possibly
to the DRAM chips), which we need to keep on.
On the A20 this has been moved to the DRAM controller, becoming a no-op.
However it is still listed in the user manual, so add it anyway.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Diffstat (limited to 'drivers/clk/sunxi/clk-simple-gates.c')
-rw-r--r-- | drivers/clk/sunxi/clk-simple-gates.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/clk/sunxi/clk-simple-gates.c b/drivers/clk/sunxi/clk-simple-gates.c index c8acc0612c15..f4da52b5ca0e 100644 --- a/drivers/clk/sunxi/clk-simple-gates.c +++ b/drivers/clk/sunxi/clk-simple-gates.c @@ -160,3 +160,15 @@ CLK_OF_DECLARE(sun5i_a13_ahb, "allwinner,sun5i-a13-ahb-gates-clk", sun4i_a10_ahb_init); CLK_OF_DECLARE(sun7i_a20_ahb, "allwinner,sun7i-a20-ahb-gates-clk", sun4i_a10_ahb_init); + +static const int sun4i_a10_dram_critical_clocks[] __initconst = { + 15, /* dram_output */ +}; + +static void __init sun4i_a10_dram_init(struct device_node *node) +{ + sunxi_simple_gates_setup(node, sun4i_a10_dram_critical_clocks, + ARRAY_SIZE(sun4i_a10_dram_critical_clocks)); +} +CLK_OF_DECLARE(sun4i_a10_dram, "allwinner,sun4i-a10-dram-gates-clk", + sun4i_a10_dram_init); |