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From:   Artur Weber <aweber.kernel@gmail.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Cc:     Alim Akhtar <alim.akhtar@samsung.com>,
        Rob Herring <robh+dt@kernel.org>,
        Sylwester Nawrocki <s.nawrocki@samsung.com>,
        Tomasz Figa <tomasz.figa@gmail.com>,
        Chanwoo Choi <cw00.choi@samsung.com>,
        Michael Turquette <mturquette@baylibre.com>,
        Stephen Boyd <sboyd@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
        Olof Johansson <olof@lixom.net>, soc@kernel.org,
        Russell King <linux@armlinux.org.uk>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Kukjin Kim <kgene@kernel.org>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Vinod Koul <vkoul@kernel.org>,
        Kishon Vijay Abraham I <kishon@kernel.org>,
        linux-arm-kernel@lists.infradead.org,
        linux-samsung-soc@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org,
        linux-pm@vger.kernel.org, linux-media@vger.kernel.org,
        linux-phy@lists.infradead.org,
        ~postmarketos/upstreaming@lists.sr.ht,
        Artur Weber <aweber.kernel@gmail.com>
Subject: [PATCH v2 06/12] clk: samsung: Re-add support for Exynos4212 CPU clock
Date:   Sun, 16 Apr 2023 15:34:16 +0200
Message-Id: <20230416133422.1949-7-aweber.kernel@gmail.com>
In-Reply-To: <20230416133422.1949-1-aweber.kernel@gmail.com>
References: <20230416133422.1949-1-aweber.kernel@gmail.com>
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The platform was originally dropped in commit bca9085e0ae9 ("ARM:
dts: exynos: remove Exynos4212 support (dead code)"), as there were
no boards using it.

We will be adding a device that uses it, so add it back.

This is effectively a revert of commit c9194fb623b0 ("clk: samsung:
Remove support for obsolete Exynos4212 CPU clock"); the driver
has changed significantly since then, prompting this re-make.

Signed-off-by: Artur Weber <aweber.kernel@gmail.com>
---
 drivers/clk/samsung/clk-exynos4.c | 44 +++++++++++++++++++++++++++----
 1 file changed, 39 insertions(+), 5 deletions(-)

diff --git a/drivers/clk/samsung/clk-exynos4.c b/drivers/clk/samsung/clk-exynos4.c
index 22009cb53428..9655f46db95c 100644
--- a/drivers/clk/samsung/clk-exynos4.c
+++ b/drivers/clk/samsung/clk-exynos4.c
@@ -138,7 +138,8 @@
 /* the exynos4 soc type */
 enum exynos4_soc {
 	EXYNOS4210,
-	EXYNOS4X12,
+	EXYNOS4412,
+	EXYNOS4212,
 };
 
 /* list of PLLs to be registered */
@@ -1205,6 +1206,24 @@ static const struct exynos_cpuclk_cfg_data e4210_armclk_d[] __initconst = {
 	{  0 },
 };
 
+static const struct exynos_cpuclk_cfg_data e4212_armclk_d[] __initconst = {
+	{ 1500000, E4210_CPU_DIV0(2, 1, 6, 0, 7, 3), E4210_CPU_DIV1(2, 6), },
+	{ 1400000, E4210_CPU_DIV0(2, 1, 6, 0, 7, 3), E4210_CPU_DIV1(2, 6), },
+	{ 1300000, E4210_CPU_DIV0(2, 1, 5, 0, 7, 3), E4210_CPU_DIV1(2, 5), },
+	{ 1200000, E4210_CPU_DIV0(2, 1, 5, 0, 7, 3), E4210_CPU_DIV1(2, 5), },
+	{ 1100000, E4210_CPU_DIV0(2, 1, 4, 0, 6, 3), E4210_CPU_DIV1(2, 4), },
+	{ 1000000, E4210_CPU_DIV0(1, 1, 4, 0, 5, 2), E4210_CPU_DIV1(2, 4), },
+	{  900000, E4210_CPU_DIV0(1, 1, 3, 0, 5, 2), E4210_CPU_DIV1(2, 3), },
+	{  800000, E4210_CPU_DIV0(1, 1, 3, 0, 5, 2), E4210_CPU_DIV1(2, 3), },
+	{  700000, E4210_CPU_DIV0(1, 1, 3, 0, 4, 2), E4210_CPU_DIV1(2, 3), },
+	{  600000, E4210_CPU_DIV0(1, 1, 3, 0, 4, 2), E4210_CPU_DIV1(2, 3), },
+	{  500000, E4210_CPU_DIV0(1, 1, 3, 0, 4, 2), E4210_CPU_DIV1(2, 3), },
+	{  400000, E4210_CPU_DIV0(1, 1, 3, 0, 4, 2), E4210_CPU_DIV1(2, 3), },
+	{  300000, E4210_CPU_DIV0(1, 1, 2, 0, 4, 2), E4210_CPU_DIV1(2, 3), },
+	{  200000, E4210_CPU_DIV0(1, 1, 1, 0, 3, 1), E4210_CPU_DIV1(2, 3), },
+	{  0 },
+};
+
 #define E4412_CPU_DIV1(cores, hpm, copy)				\
 		(((cores) << 8) | ((hpm) << 4) | ((copy) << 0))
 
@@ -1233,6 +1252,11 @@ static const struct samsung_cpu_clock exynos4210_cpu_clks[] __initconst = {
 			CLK_CPU_NEEDS_DEBUG_ALT_DIV | CLK_CPU_HAS_DIV1, 0x14200, e4210_armclk_d),
 };
 
+static const struct samsung_cpu_clock exynos4212_cpu_clks[] __initconst = {
+	CPU_CLK(CLK_ARM_CLK, "armclk", CLK_MOUT_APLL, CLK_MOUT_MPLL_USER_C,
+			CLK_CPU_NEEDS_DEBUG_ALT_DIV | CLK_CPU_HAS_DIV1, 0x14200, e4212_armclk_d),
+};
+
 static const struct samsung_cpu_clock exynos4412_cpu_clks[] __initconst = {
 	CPU_CLK(CLK_ARM_CLK, "armclk", CLK_MOUT_APLL, CLK_MOUT_MPLL_USER_C,
 			CLK_CPU_NEEDS_DEBUG_ALT_DIV | CLK_CPU_HAS_DIV1, 0x14200, e4412_armclk_d),
@@ -1326,11 +1350,15 @@ static void __init exynos4_clk_init(struct device_node *np,
 		samsung_clk_register_fixed_factor(ctx,
 			exynos4x12_fixed_factor_clks,
 			ARRAY_SIZE(exynos4x12_fixed_factor_clks));
-		samsung_clk_register_cpu(ctx, exynos4412_cpu_clks,
-				ARRAY_SIZE(exynos4412_cpu_clks));
+		if (soc == EXYNOS4412)
+			samsung_clk_register_cpu(ctx, exynos4412_cpu_clks,
+					ARRAY_SIZE(exynos4412_cpu_clks));
+		else
+			samsung_clk_register_cpu(ctx, exynos4212_cpu_clks,
+					ARRAY_SIZE(exynos4212_cpu_clks));
 	}
 
-	if (soc == EXYNOS4X12)
+	if (soc == EXYNOS4412 || soc == EXYNOS4212)
 		exynos4x12_core_down_clock();
 
 	samsung_clk_extended_sleep_init(reg_base,
@@ -1363,8 +1391,14 @@ static void __init exynos4210_clk_init(struct device_node *np)
 }
 CLK_OF_DECLARE(exynos4210_clk, "samsung,exynos4210-clock", exynos4210_clk_init);
 
+static void __init exynos4212_clk_init(struct device_node *np)
+{
+	exynos4_clk_init(np, EXYNOS4212);
+}
+CLK_OF_DECLARE(exynos4212_clk, "samsung,exynos4212-clock", exynos4212_clk_init);
+
 static void __init exynos4412_clk_init(struct device_node *np)
 {
-	exynos4_clk_init(np, EXYNOS4X12);
+	exynos4_clk_init(np, EXYNOS4412);
 }
 CLK_OF_DECLARE(exynos4412_clk, "samsung,exynos4412-clock", exynos4412_clk_init);
-- 
2.40.0