[PATCH 3/3] clk: samsung: Use cached clk_hws instead of __clk_lookup() calls

Sylwester Nawrocki
2020-08-26T17:16:23Z

For the CPU clock registration two parent clocks are required, these
are now being passed as struct clk_hw pointers, rather than by the
global scope names. That allows us to avoid __clk_lookup() calls
and simplifies a bit the CPU clock registration function.
While at it drop unneeded extern keyword in the function declaration.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
---
drivers/clk/samsung/clk-cpu.c | 37 +++++++++++++++---------------------
drivers/clk/samsung/clk-cpu.h | 6 +++---
drivers/clk/samsung/clk-exynos3250.c | 6 ++++--
drivers/clk/samsung/clk-exynos4.c | 7 +++++--
drivers/clk/samsung/clk-exynos5250.c | 4 +++-
drivers/clk/samsung/clk-exynos5420.c | 6 +++---
drivers/clk/samsung/clk-exynos5433.c | 10 ++++++++--
7 files changed, 41 insertions(+), 35 deletions(-)

diff --git a/drivers/clk/samsung/clk-cpu.c b/drivers/clk/samsung/clk-cpu.c
index efc4fa6..00ef4d1 100644
--- a/drivers/clk/samsung/clk-cpu.c
+++ b/drivers/clk/samsung/clk-cpu.c
@@ -401,26 +401,34 @@ static int exynos5433_cpuclk_notifier_cb(struct notifier_block *nb,

/* helper function to register a CPU clock */
int __init exynos_register_cpu_clock(struct samsung_clk_provider *ctx,
- unsigned int lookup_id, const char *name, const char *parent,
- const char *alt_parent, unsigned long offset,
- const struct exynos_cpuclk_cfg_data *cfg,
+ unsigned int lookup_id, const char *name,
+ const struct clk_hw *parent, const struct clk_hw *alt_parent,
+ unsigned long offset, const struct exynos_cpuclk_cfg_data *cfg,
unsigned long num_cfgs, unsigned long flags)
{
struct exynos_cpuclk *cpuclk;
struct clk_init_data init;
- struct clk *parent_clk;
+ const char *parent_name;
int ret = 0;

+ if (IS_ERR(parent) || IS_ERR(alt_parent)) {
+ pr_err("%s: invalid parent clock(s)\n", __func__);
+ return -EINVAL;
+ }
+
cpuclk = kzalloc(sizeof(*cpuclk), GFP_KERNEL);
if (!cpuclk)
return -ENOMEM;

+ parent_name = clk_hw_get_name(parent);
+
init.name = name;
init.flags = CLK_SET_RATE_PARENT;
- init.parent_names = &parent;
+ init.parent_names = &parent_name;
init.num_parents = 1;
init.ops = &exynos_cpuclk_clk_ops;

+ cpuclk->alt_parent = alt_parent;
cpuclk->hw.init = &init;
cpuclk->ctrl_base = ctx->reg_base + offset;
cpuclk->lock = &ctx->lock;
@@ -430,23 +438,8 @@ int __init exynos_register_cpu_clock(struct samsung_clk_provider *ctx,
else
cpuclk->clk_nb.notifier_call = exynos_cpuclk_notifier_cb;

- cpuclk->alt_parent = __clk_get_hw(__clk_lookup(alt_parent));
- if (!cpuclk->alt_parent) {
- pr_err("%s: could not lookup alternate parent %s\n",
- __func__, alt_parent);
- ret = -EINVAL;
- goto free_cpuclk;
- }
-
- parent_clk = __clk_lookup(parent);
- if (!parent_clk) {
- pr_err("%s: could not lookup parent clock %s\n",
- __func__, parent);
- ret = -EINVAL;
- goto free_cpuclk;
- }

- ret = clk_notifier_register(parent_clk, &cpuclk->clk_nb);
+ ret = clk_notifier_register(parent->clk, &cpuclk->clk_nb);
if (ret) {
pr_err("%s: failed to register clock notifier for %s\n",
__func__, name);
@@ -471,7 +464,7 @@ int __init exynos_register_cpu_clock(struct samsung_clk_provider *ctx,
free_cpuclk_data:
kfree(cpuclk->cfg);
unregister_clk_nb:
- clk_notifier_unregister(parent_clk, &cpuclk->clk_nb);
+ clk_notifier_unregister(parent->clk, &cpuclk->clk_nb);
free_cpuclk:
kfree(cpuclk);
return ret;
diff --git a/drivers/clk/samsung/clk-cpu.h b/drivers/clk/samsung/clk-cpu.h
index ad38cc2..af74686 100644
--- a/drivers/clk/samsung/clk-cpu.h
+++ b/drivers/clk/samsung/clk-cpu.h
@@ -46,7 +46,7 @@ struct exynos_cpuclk_cfg_data {
*/
struct exynos_cpuclk {
struct clk_hw hw;
- struct clk_hw *alt_parent;
+ const struct clk_hw *alt_parent;
void __iomem *ctrl_base;
spinlock_t *lock;
const struct exynos_cpuclk_cfg_data *cfg;
@@ -62,9 +62,9 @@ struct exynos_cpuclk {
#define CLK_CPU_HAS_E5433_REGS_LAYOUT (1 << 2)
};

-extern int __init exynos_register_cpu_clock(struct samsung_clk_provider *ctx,
+int __init exynos_register_cpu_clock(struct samsung_clk_provider *ctx,
unsigned int lookup_id, const char *name,
- const char *parent, const char *alt_parent,
+ const struct clk_hw *parent, const struct clk_hw *alt_parent,
unsigned long offset,
const struct exynos_cpuclk_cfg_data *cfg,
unsigned long num_cfgs, unsigned long flags);
diff --git a/drivers/clk/samsung/clk-exynos3250.c b/drivers/clk/samsung/clk-exynos3250.c
index 17897c7..17df7f9 100644
--- a/drivers/clk/samsung/clk-exynos3250.c
+++ b/drivers/clk/samsung/clk-exynos3250.c
@@ -808,14 +808,16 @@ static const struct exynos_cpuclk_cfg_data e3250_armclk_d[] __initconst = {
static void __init exynos3250_cmu_init(struct device_node *np)
{
struct samsung_clk_provider *ctx;
+ struct clk_hw **hws;

ctx = samsung_cmu_register_one(np, &cmu_info);
if (!ctx)
return;

+ hws = ctx->clk_data.hws;
exynos_register_cpu_clock(ctx, CLK_ARM_CLK, "armclk",
- mout_core_p[0], mout_core_p[1], 0x14200,
- e3250_armclk_d, ARRAY_SIZE(e3250_armclk_d),
+ hws[CLK_MOUT_APLL], hws[CLK_MOUT_MPLL_USER_C],
+ 0x14200, e3250_armclk_d, ARRAY_SIZE(e3250_armclk_d),
CLK_CPU_HAS_DIV1);

exynos3_core_down_clock(ctx->reg_base);
diff --git a/drivers/clk/samsung/clk-exynos4.c b/drivers/clk/samsung/clk-exynos4.c
index 51564fc..436fcd2 100644
--- a/drivers/clk/samsung/clk-exynos4.c
+++ b/drivers/clk/samsung/clk-exynos4.c
@@ -1233,6 +1233,8 @@ static void __init exynos4_clk_init(struct device_node *np,
enum exynos4_soc soc)
{
struct samsung_clk_provider *ctx;
+ struct clk_hw **hws;
+
exynos4_soc = soc;

reg_base = of_iomap(np, 0);
@@ -1240,6 +1242,7 @@ static void __init exynos4_clk_init(struct device_node *np,
panic("%s: failed to map registers\n", __func__);

ctx = samsung_clk_init(np, reg_base, CLK_NR_CLKS);
+ hws = ctx->clk_data.hws;

samsung_clk_of_register_fixed_ext(ctx, exynos4_fixed_rate_ext_clks,
ARRAY_SIZE(exynos4_fixed_rate_ext_clks),
@@ -1302,7 +1305,7 @@ static void __init exynos4_clk_init(struct device_node *np,
exynos4210_fixed_factor_clks,
ARRAY_SIZE(exynos4210_fixed_factor_clks));
exynos_register_cpu_clock(ctx, CLK_ARM_CLK, "armclk",
- mout_core_p4210[0], mout_core_p4210[1], 0x14200,
+ hws[CLK_MOUT_APLL], hws[CLK_SCLK_MPLL], 0x14200,
e4210_armclk_d, ARRAY_SIZE(e4210_armclk_d),
CLK_CPU_NEEDS_DEBUG_ALT_DIV | CLK_CPU_HAS_DIV1);
} else {
@@ -1317,7 +1320,7 @@ static void __init exynos4_clk_init(struct device_node *np,
ARRAY_SIZE(exynos4x12_fixed_factor_clks));

exynos_register_cpu_clock(ctx, CLK_ARM_CLK, "armclk",
- mout_core_p4x12[0], mout_core_p4x12[1], 0x14200,
+ hws[CLK_MOUT_APLL], hws[CLK_MOUT_MPLL_USER_C], 0x14200,
e4412_armclk_d, ARRAY_SIZE(e4412_armclk_d),
CLK_CPU_NEEDS_DEBUG_ALT_DIV | CLK_CPU_HAS_DIV1);
}
diff --git a/drivers/clk/samsung/clk-exynos5250.c b/drivers/clk/samsung/clk-exynos5250.c
index 7bcff76..06588fa 100644
--- a/drivers/clk/samsung/clk-exynos5250.c
+++ b/drivers/clk/samsung/clk-exynos5250.c
@@ -782,6 +782,7 @@ static void __init exynos5250_clk_init(struct device_node *np)
{
struct samsung_clk_provider *ctx;
unsigned int tmp;
+ struct clk_hw **hws;

if (np) {
reg_base = of_iomap(np, 0);
@@ -792,6 +793,7 @@ static void __init exynos5250_clk_init(struct device_node *np)
}

ctx = samsung_clk_init(np, reg_base, CLK_NR_CLKS);
+ hws = ctx->clk_data.hws;

samsung_clk_of_register_fixed_ext(ctx, exynos5250_fixed_rate_ext_clks,
ARRAY_SIZE(exynos5250_fixed_rate_ext_clks),
@@ -821,7 +823,7 @@ static void __init exynos5250_clk_init(struct device_node *np)
samsung_clk_register_gate(ctx, exynos5250_gate_clks,
ARRAY_SIZE(exynos5250_gate_clks));
exynos_register_cpu_clock(ctx, CLK_ARM_CLK, "armclk",
- mout_cpu_p[0], mout_cpu_p[1], 0x200,
+ hws[CLK_MOUT_APLL], hws[CLK_MOUT_MPLL], 0x200,
exynos5250_armclk_d, ARRAY_SIZE(exynos5250_armclk_d),
CLK_CPU_HAS_DIV1);

diff --git a/drivers/clk/samsung/clk-exynos5420.c b/drivers/clk/samsung/clk-exynos5420.c
index d07cee2..ba4e0a4 100644
--- a/drivers/clk/samsung/clk-exynos5420.c
+++ b/drivers/clk/samsung/clk-exynos5420.c
@@ -1625,15 +1625,15 @@ static void __init exynos5x_clk_init(struct device_node *np,

if (soc == EXYNOS5420) {
exynos_register_cpu_clock(ctx, CLK_ARM_CLK, "armclk",
- mout_cpu_p[0], mout_cpu_p[1], 0x200,
+ hws[CLK_MOUT_APLL], hws[CLK_MOUT_MSPLL_CPU], 0x200,
exynos5420_eglclk_d, ARRAY_SIZE(exynos5420_eglclk_d), 0);
} else {
exynos_register_cpu_clock(ctx, CLK_ARM_CLK, "armclk",
- mout_cpu_p[0], mout_cpu_p[1], 0x200,
+ hws[CLK_MOUT_APLL], hws[CLK_MOUT_MSPLL_CPU], 0x200,
exynos5800_eglclk_d, ARRAY_SIZE(exynos5800_eglclk_d), 0);
}
exynos_register_cpu_clock(ctx, CLK_KFC_CLK, "kfcclk",
- mout_kfc_p[0], mout_kfc_p[1], 0x28200,
+ hws[CLK_MOUT_KPLL], hws[CLK_MOUT_MSPLL_KFC], 0x28200,
exynos5420_kfcclk_d, ARRAY_SIZE(exynos5420_kfcclk_d), 0);

samsung_clk_extended_sleep_init(reg_base,
diff --git a/drivers/clk/samsung/clk-exynos5433.c b/drivers/clk/samsung/clk-exynos5433.c
index 6f29ecd..f203074 100644
--- a/drivers/clk/samsung/clk-exynos5433.c
+++ b/drivers/clk/samsung/clk-exynos5433.c
@@ -3679,6 +3679,7 @@ static void __init exynos5433_cmu_apollo_init(struct device_node *np)
{
void __iomem *reg_base;
struct samsung_clk_provider *ctx;
+ struct clk_hw **hws;

reg_base = of_iomap(np, 0);
if (!reg_base) {
@@ -3701,8 +3702,10 @@ static void __init exynos5433_cmu_apollo_init(struct device_node *np)
samsung_clk_register_gate(ctx, apollo_gate_clks,
ARRAY_SIZE(apollo_gate_clks));

+ hws = ctx->clk_data.hws;
+
exynos_register_cpu_clock(ctx, CLK_SCLK_APOLLO, "apolloclk",
- mout_apollo_p[0], mout_apollo_p[1], 0x200,
+ hws[CLK_MOUT_APOLLO_PLL], hws[CLK_MOUT_BUS_PLL_APOLLO_USER], 0x200,
exynos5433_apolloclk_d, ARRAY_SIZE(exynos5433_apolloclk_d),
CLK_CPU_HAS_E5433_REGS_LAYOUT);

@@ -3933,6 +3936,7 @@ static void __init exynos5433_cmu_atlas_init(struct device_node *np)
{
void __iomem *reg_base;
struct samsung_clk_provider *ctx;
+ struct clk_hw **hws;

reg_base = of_iomap(np, 0);
if (!reg_base) {
@@ -3955,8 +3959,10 @@ static void __init exynos5433_cmu_atlas_init(struct device_node *np)
samsung_clk_register_gate(ctx, atlas_gate_clks,
ARRAY_SIZE(atlas_gate_clks));

+ hws = ctx->clk_data.hws;
+
exynos_register_cpu_clock(ctx, CLK_SCLK_ATLAS, "atlasclk",
- mout_atlas_p[0], mout_atlas_p[1], 0x200,
+ hws[CLK_MOUT_ATLAS_PLL], hws[CLK_MOUT_BUS_PLL_ATLAS_USER], 0x200,
exynos5433_atlasclk_d, ARRAY_SIZE(exynos5433_atlasclk_d),
CLK_CPU_HAS_E5433_REGS_LAYOUT);

--
2.7.4