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clk: arm: sunxi: Add a new clock driver for sunxi SOCs

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This commit implements the base CPU clocks for sunxi devices. It has
been tested using a slightly modified cpufreq driver from the
linux-sunxi 3.0 tree.

Additionally, document the new bindings introduced by this patch.

Idling:
    / # cat /sys/kernel/debug/clk/clk_summary
       clock                        enable_cnt  prepare_cnt  rate
    ---------------------------------------------------------------------
     osc32k                         0           0            32768
     osc24M_fixed                   0           0            24000000
        osc24M                      0           0            24000000
           apb1_mux                 0           0            24000000
              apb1                  0           0            24000000
           pll1                     0           0            60000000
              cpu                   0           0            60000000
                 axi                0           0            60000000
                    ahb             0           0            60000000
                       apb0         0           0            30000000
     dummy                          0           0            0

After "yes >/dev/null &":
    / # cat /sys/kernel/debug/clk/clk_summary
       clock                        enable_cnt  prepare_cnt  rate
    ---------------------------------------------------------------------
     osc32k                         0           0            32768
     osc24M_fixed                   0           0            24000000
        osc24M                      0           0            24000000
           apb1_mux                 0           0            24000000
              apb1                  0           0            24000000
           pll1                     0           0            1008000000
              cpu                   0           0            1008000000
                 axi                0           0            336000000
                    ahb             0           0            168000000
                       apb0         0           0            84000000
     dummy                          0           0            0

Signed-off-by: Emilio López <emilio@elopez.com.ar>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
This commit is contained in:
Emilio López
2013-02-25 11:44:26 -03:00
committed by Mike Turquette
parent b548916851
commit e874a66977
8 changed files with 643 additions and 2 deletions
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4
drivers/clocksource/sunxi_timer.c
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@@ -23,7 +23,7 @@
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/sunxi_timer.h>
#include <linux/clk-provider.h>
#include <linux/clk/sunxi.h>
#define TIMER_CTL_REG 0x00
#define TIMER_CTL_ENABLE (1 << 0)
@@ -123,7 +123,7 @@ void __init sunxi_timer_init(void)
if (irq <= 0)
panic("Can't parse IRQ");
of_clk_init(NULL);
sunxi_init_clocks();
clk = of_clk_get(node, 0);
if (IS_ERR(clk))