[PATCH v4 1/2] [RFT] clk: samsung: add support for CPU clocks

Will McVicker
2021-10-14T19:53:57Z

Adds 'struct samsung_cpu_clock' and corresponding CPU clock registration
function to the samsung common clk driver. This allows samsung clock
drivers to register their CPU clocks with the samsung_cmu_register_one()
API.

Currently the exynos5433 apollo and atlas clks have their own custom
init functions to handle registering their CPU clocks. With this patch
we can drop their custom CLK_OF_DECLARE functions and directly call
samsung_cmu_register_one().

Signed-off-by: Will McVicker <willmcvicker@google.com>
---
drivers/clk/samsung/clk-cpu.c | 18 ++++++++++++++++++
drivers/clk/samsung/clk.c | 2 ++
drivers/clk/samsung/clk.h | 26 ++++++++++++++++++++++++++
3 files changed, 46 insertions(+)

diff --git a/drivers/clk/samsung/clk-cpu.c b/drivers/clk/samsung/clk-cpu.c
index 00ef4d1b0888..7f20d9aedaa9 100644
--- a/drivers/clk/samsung/clk-cpu.c
+++ b/drivers/clk/samsung/clk-cpu.c
@@ -469,3 +469,21 @@ int __init exynos_register_cpu_clock(struct samsung_clk_provider *ctx,
kfree(cpuclk);
return ret;
}
+
+void __init samsung_clk_register_cpu(struct samsung_clk_provider *ctx,
+ const struct samsung_cpu_clock *list, unsigned int nr_clk)
+{
+ unsigned int idx;
+ unsigned int num_cfgs;
+ struct clk_hw **hws = ctx->clk_data.hws;
+
+ for (idx = 0; idx < nr_clk; idx++, list++) {
+ /* find count of configuration rates in cfg */
+ for (num_cfgs = 0; list->cfg[num_cfgs].prate != 0; )
+ num_cfgs++;
+
+ exynos_register_cpu_clock(ctx, list->id, list->name, hws[list->parent_id],
+ hws[list->alt_parent_id], list->offset, list->cfg, num_cfgs,
+ list->flags);
+ }
+}
diff --git a/drivers/clk/samsung/clk.c b/drivers/clk/samsung/clk.c
index 1949ae7851b2..336243c6f120 100644
--- a/drivers/clk/samsung/clk.c
+++ b/drivers/clk/samsung/clk.c
@@ -378,6 +378,8 @@ struct samsung_clk_provider * __init samsung_cmu_register_one(
samsung_clk_extended_sleep_init(reg_base,
cmu->clk_regs, cmu->nr_clk_regs,
cmu->suspend_regs, cmu->nr_suspend_regs);
+ if (cmu->cpu_clks)
+ samsung_clk_register_cpu(ctx, cmu->cpu_clks, cmu->nr_cpu_clks);

samsung_clk_of_add_provider(np, ctx);

diff --git a/drivers/clk/samsung/clk.h b/drivers/clk/samsung/clk.h
index c1e1a6b2f499..26499e97275b 100644
--- a/drivers/clk/samsung/clk.h
+++ b/drivers/clk/samsung/clk.h
@@ -271,6 +271,27 @@ struct samsung_pll_clock {
__PLL(_typ, _id, _name, _pname, CLK_GET_RATE_NOCACHE, _lock, \
_con, _rtable)

+struct samsung_cpu_clock {
+ unsigned int id;
+ const char *name;
+ unsigned int parent_id;
+ unsigned int alt_parent_id;
+ unsigned long flags;
+ int offset;
+ const struct exynos_cpuclk_cfg_data *cfg;
+};
+
+#define CPU_CLK(_id, _name, _pid, _apid, _flags, _offset, _cfg) \
+ { \
+ .id = _id, \
+ .name = _name, \
+ .parent_id = _pid, \
+ .alt_parent_id = _apid, \
+ .flags = _flags, \
+ .offset = _offset, \
+ .cfg = _cfg, \
+ }
+
struct samsung_clock_reg_cache {
struct list_head node;
void __iomem *reg_base;
@@ -301,6 +322,9 @@ struct samsung_cmu_info {
unsigned int nr_fixed_factor_clks;
/* total number of clocks with IDs assigned*/
unsigned int nr_clk_ids;
+ /* list of cpu clocks and respective count */
+ const struct samsung_cpu_clock *cpu_clks;
+ unsigned int nr_cpu_clks;

/* list and number of clocks registers */
const unsigned long *clk_regs;
@@ -350,6 +374,8 @@ extern void __init samsung_clk_register_gate(struct samsung_clk_provider *ctx,
extern void __init samsung_clk_register_pll(struct samsung_clk_provider *ctx,
const struct samsung_pll_clock *pll_list,
unsigned int nr_clk, void __iomem *base);
+extern void samsung_clk_register_cpu(struct samsung_clk_provider *ctx,
+ const struct samsung_cpu_clock *list, unsigned int nr_clk);

extern struct samsung_clk_provider __init *samsung_cmu_register_one(
struct device_node *,
--
2.33.0.1079.g6e70778dc9-goog