clk: samsung: add support for CPU clocks

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>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20211014195347.3635601-2-willmcvicker@google.comSigned-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>

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);
+	}
+}

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);
 

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 *,