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clk: uniphier: add CPU-gear change (cpufreq) support

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Core support code for CPU frequency changes, which will be used by
the generic cpufreq driver.

The register view is different from the generic clk-mux; it has
a separate status register, and an update bit to load the register
setting.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Masahiro Yamada
2016-12-07 10:32:32 +09:00
committed by Stephen Boyd
parent e3f4358e23
commit d08f1f0d59
4 changed files with 136 additions and 2 deletions
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17
drivers/clk/uniphier/clk-uniphier.h
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@@ -20,15 +20,24 @@ struct clk_hw;
struct device;
struct regmap;
#define UNIPHIER_CLK_MUX_MAX_PARENTS 8
#define UNIPHIER_CLK_CPUGEAR_MAX_PARENTS 16
#define UNIPHIER_CLK_MUX_MAX_PARENTS 8
enum uniphier_clk_type {
UNIPHIER_CLK_TYPE_CPUGEAR,
UNIPHIER_CLK_TYPE_FIXED_FACTOR,
UNIPHIER_CLK_TYPE_FIXED_RATE,
UNIPHIER_CLK_TYPE_GATE,
UNIPHIER_CLK_TYPE_MUX,
};
struct uniphier_clk_cpugear_data {
const char *parent_names[UNIPHIER_CLK_CPUGEAR_MAX_PARENTS];
unsigned int num_parents;
unsigned int regbase;
unsigned int mask;
};
struct uniphier_clk_fixed_factor_data {
const char *parent_name;
unsigned int mult;
@@ -58,6 +67,7 @@ struct uniphier_clk_data {
enum uniphier_clk_type type;
int idx;
union {
struct uniphier_clk_cpugear_data cpugear;
struct uniphier_clk_fixed_factor_data factor;
struct uniphier_clk_fixed_rate_data rate;
struct uniphier_clk_gate_data gate;
@@ -90,7 +100,10 @@ struct uniphier_clk_data {
}, \
}
struct clk_hw *uniphier_clk_register_cpugear(struct device *dev,
struct regmap *regmap,
const char *name,
const struct uniphier_clk_cpugear_data *data);
struct clk_hw *uniphier_clk_register_fixed_factor(struct device *dev,
const char *name,
const struct uniphier_clk_fixed_factor_data *data);