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authorMaxime Ripard <maxime.ripard@free-electrons.com>2014-05-09 22:33:39 -0500
committerMaxime Ripard <maxime.ripard@free-electrons.com>2014-06-11 10:25:01 +0200
commit134a6690a3caf6d52d0bc1b643650c6051c791d2 (patch)
tree5c538a36fcad37b35db9e3c2b69f8ab61c1adc09 /drivers/clk/sunxi/clk-sunxi.c
parent59cb10e32a60533865e26dc9a8303306ba972a70 (diff)
clk: sunxi: Rework clock protection code
Since we start to have a lot of clocks to protect, some of them in a few SoCs only, it becomes difficult to handle the clock protection without having to add per machine exceptions. Add per-SoC data to tell which clock to leave enabled. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Acked-by: Mike Turquette <mturquette@linaro.org> Signed-off-by: Emilio López <emilio@elopez.com.ar>
Diffstat (limited to 'drivers/clk/sunxi/clk-sunxi.c')
-rw-r--r--drivers/clk/sunxi/clk-sunxi.c72
1 files changed, 44 insertions, 28 deletions
diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c
index 880095048d4d..4e8ff4565e59 100644
--- a/drivers/clk/sunxi/clk-sunxi.c
+++ b/drivers/clk/sunxi/clk-sunxi.c
@@ -1172,29 +1172,10 @@ static void __init of_sunxi_table_clock_setup(const struct of_device_id *clk_mat
}
}
-/**
- * System clock protection
- *
- * By enabling these critical clocks, we prevent their accidental gating
- * by the framework
- */
-static void __init sunxi_clock_protect(void)
+static void __init sunxi_init_clocks(const char *clocks[], int nclocks)
{
- struct clk *clk;
-
- /* memory bus clock - sun5i+ */
- clk = clk_get(NULL, "mbus");
- if (!IS_ERR(clk))
- clk_prepare_enable(clk);
-
- /* DDR clock - sun4i+ */
- clk = clk_get(NULL, "pll5_ddr");
- if (!IS_ERR(clk))
- clk_prepare_enable(clk);
-}
+ unsigned int i;
-static void __init sunxi_init_clocks(struct device_node *np)
-{
/* Register factor clocks */
of_sunxi_table_clock_setup(clk_factors_match, sunxi_factors_clk_setup);
@@ -1210,11 +1191,46 @@ static void __init sunxi_init_clocks(struct device_node *np)
/* Register gate clocks */
of_sunxi_table_clock_setup(clk_gates_match, sunxi_gates_clk_setup);
- /* Enable core system clocks */
- sunxi_clock_protect();
+ /* Protect the clocks that needs to stay on */
+ for (i = 0; i < nclocks; i++) {
+ struct clk *clk = clk_get(NULL, clocks[i]);
+
+ if (!IS_ERR(clk))
+ clk_prepare_enable(clk);
+ }
+}
+
+static const char *sun4i_a10_critical_clocks[] __initdata = {
+ "pll5_ddr",
+};
+
+static void __init sun4i_a10_init_clocks(struct device_node *node)
+{
+ sunxi_init_clocks(sun4i_a10_critical_clocks,
+ ARRAY_SIZE(sun4i_a10_critical_clocks));
+}
+CLK_OF_DECLARE(sun4i_a10_clk_init, "allwinner,sun4i-a10", sun4i_a10_init_clocks);
+
+static const char *sun5i_critical_clocks[] __initdata = {
+ "mbus",
+ "pll5_ddr",
+};
+
+static void __init sun5i_init_clocks(struct device_node *node)
+{
+ sunxi_init_clocks(sun5i_critical_clocks,
+ ARRAY_SIZE(sun5i_critical_clocks));
+}
+CLK_OF_DECLARE(sun5i_a10s_clk_init, "allwinner,sun5i-a10s", sun5i_init_clocks);
+CLK_OF_DECLARE(sun5i_a13_clk_init, "allwinner,sun5i-a13", sun5i_init_clocks);
+CLK_OF_DECLARE(sun7i_a20_clk_init, "allwinner,sun7i-a20", sun5i_init_clocks);
+
+static const char *sun6i_critical_clocks[] __initdata = {
+};
+
+static void __init sun6i_init_clocks(struct device_node *node)
+{
+ sunxi_init_clocks(sun6i_critical_clocks,
+ ARRAY_SIZE(sun6i_critical_clocks));
}
-CLK_OF_DECLARE(sun4i_a10_clk_init, "allwinner,sun4i-a10", sunxi_init_clocks);
-CLK_OF_DECLARE(sun5i_a10s_clk_init, "allwinner,sun5i-a10s", sunxi_init_clocks);
-CLK_OF_DECLARE(sun5i_a13_clk_init, "allwinner,sun5i-a13", sunxi_init_clocks);
-CLK_OF_DECLARE(sun6i_a31_clk_init, "allwinner,sun6i-a31", sunxi_init_clocks);
-CLK_OF_DECLARE(sun7i_a20_clk_init, "allwinner,sun7i-a20", sunxi_init_clocks);
+CLK_OF_DECLARE(sun6i_a31_clk_init, "allwinner,sun6i-a31", sun6i_init_clocks);