[PATCH v2 03/12] clk: samsung: add support for CPU clocks

From: Will McVicker <willmcvicker@google.com>
To: Russell King <linux@armlinux.org.uk>,
	Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Michael Turquette <mturquette@baylibre.com>,
	Stephen Boyd <sboyd@kernel.org>,
	Sylwester Nawrocki <s.nawrocki@samsung.com>,
	Tomasz Figa <tomasz.figa@gmail.com>,
	Chanwoo Choi <cw00.choi@samsung.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	Alessandro Zummo <a.zummo@towertech.it>,
	Alexandre Belloni <alexandre.belloni@bootlin.com>,
	John Stultz <john.stultz@linaro.org>,
	Thomas Gleixner <tglx@linutronix.de>
Cc: Lee Jones <lee.jones@linaro.org>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Saravana Kannan <saravanak@google.com>,
	Will McVicker <willmcvicker@google.com>,
	kernel-team@android.com, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org,
	linux-clk@vger.kernel.org, linux-gpio@vger.kernel.org,
	linux-rtc@vger.kernel.org
Subject: [PATCH v2 03/12] clk: samsung: add support for CPU clocks
Date: Tue, 28 Sep 2021 23:56:20 +0000	[thread overview]
Message-ID: <20210928235635.1348330-4-willmcvicker@google.com> (raw)
In-Reply-To: <20210928235635.1348330-1-willmcvicker@google.com>

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

Signed-off-by: Will McVicker <willmcvicker@google.com>
---
 drivers/clk/samsung/clk-cpu.c | 26 ++++++++++++++++++++++++++
 drivers/clk/samsung/clk.c     |  2 ++
 drivers/clk/samsung/clk.h     | 26 ++++++++++++++++++++++++++
 3 files changed, 54 insertions(+)

diff --git a/drivers/clk/samsung/clk-cpu.c b/drivers/clk/samsung/clk-cpu.c
index 00ef4d1b0888..b5017934fc41 100644
--- a/drivers/clk/samsung/clk-cpu.c
+++ b/drivers/clk/samsung/clk-cpu.c
@@ -469,3 +469,29 @@ int __init exynos_register_cpu_clock(struct samsung_clk_provider *ctx,
 	kfree(cpuclk);
 	return ret;
 }
+
+void 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 *parent_clk, *alt_parent_clk;
+	const struct clk_hw *parent_clk_hw = NULL;
+	const struct clk_hw *alt_parent_clk_hw = NULL;
+
+	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++;
+
+		parent_clk = __clk_lookup(list->parent_name);
+		if (parent_clk)
+			parent_clk_hw = __clk_get_hw(parent_clk);
+		alt_parent_clk = __clk_lookup(list->alt_parent_name);
+		if (alt_parent_clk)
+			alt_parent_clk_hw = __clk_get_hw(alt_parent_clk);
+
+		exynos_register_cpu_clock(ctx, list->id, list->name, parent_clk_hw,
+				alt_parent_clk_hw, 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..a52a38cc1740 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;
+	const char		*parent_name;
+	const char		*alt_parent_name;
+	unsigned long		flags;
+	int			offset;
+	const struct exynos_cpuclk_cfg_data *cfg;
+};
+
+#define CPU_CLK(_id, _name, _pname, _apname, _flags, _offset, _cfg) \
+	{							    \
+		.id		  = _id,			    \
+		.name		  = _name,			    \
+		.parent_name	  = _pname,			    \
+		.alt_parent_name  = _apname,			    \
+		.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 __init 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 *,
-- 
2.33.0.685.g46640cef36-goog

