linux-kernel - [PATCH v2 12/13] cpufreq: sun50i: add a100 cpufreq support

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Message-ID: <20241031070232.1793078-13-masterr3c0rd@epochal.quest>
Date: Thu, 31 Oct 2024 04:02:25 -0300
From: Cody Eksal <masterr3c0rd@...chal.quest>
To: "Rafael J. Wysocki" <rafael@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Yangtao Li <tiny.windzz@...il.com>,
	Chen-Yu Tsai <wens@...e.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>
Cc: Conor Dooley <conor+dt@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Maxime Ripard <mripard@...nel.org>,
	Michael Turquette <mturquette@...libre.com>,
	Nishanth Menon <nm@...com>,
	Rob Herring <robh@...nel.org>,
	Stephen Boyd <sboyd@...nel.org>,
	Vinod Koul <vkoul@...nel.org>,
	Viresh Kumar <vireshk@...nel.org>,
	Parthiban <parthiban@...umiz.com>,
	Andre Przywara <andre.przywara@....com>,
	Cody Eksal <masterr3c0rd@...chal.quest>,
	linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-sunxi@...ts.linux.dev
Subject: [PATCH v2 12/13] cpufreq: sun50i: add a100 cpufreq support

From: Shuosheng Huang <huangshuosheng@...winnertech.com>

Let's add cpufreq nvmem based for allwinner a100 soc. It's similar to h6,
let us use efuse_xlate to extract the differentiated part.

Signed-off-by: Shuosheng Huang <huangshuosheng@...winnertech.com>
[masterr3c0rd@...chal.quest: add A100 to opp_match_list]
Signed-off-by: Cody Eksal <masterr3c0rd@...chal.quest>
---
Changes in V2:
 - Add the A100 to the cpufreq-dt-platdev blacklist.

 drivers/cpufreq/cpufreq-dt-platdev.c   |  1 +
 drivers/cpufreq/sun50i-cpufreq-nvmem.c | 28 ++++++++++++++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/drivers/cpufreq/cpufreq-dt-platdev.c b/drivers/cpufreq/cpufreq-dt-platdev.c
index 18942bfe9c95..2a3e8bd317c9 100644
--- a/drivers/cpufreq/cpufreq-dt-platdev.c
+++ b/drivers/cpufreq/cpufreq-dt-platdev.c
@@ -103,6 +103,7 @@ static const struct of_device_id allowlist[] __initconst = {
  * platforms using "operating-points-v2" property.
  */
 static const struct of_device_id blocklist[] __initconst = {
+	{ .compatible = "allwinner,sun50i-a100" },
 	{ .compatible = "allwinner,sun50i-h6", },
 	{ .compatible = "allwinner,sun50i-h616", },
 	{ .compatible = "allwinner,sun50i-h618", },
diff --git a/drivers/cpufreq/sun50i-cpufreq-nvmem.c b/drivers/cpufreq/sun50i-cpufreq-nvmem.c
index 293921acec93..3a29c026d364 100644
--- a/drivers/cpufreq/sun50i-cpufreq-nvmem.c
+++ b/drivers/cpufreq/sun50i-cpufreq-nvmem.c
@@ -22,6 +22,9 @@
 #define NVMEM_MASK	0x7
 #define NVMEM_SHIFT	5
 
+#define SUN50I_A100_NVMEM_MASK	0xf
+#define SUN50I_A100_NVMEM_SHIFT	12
+
 static struct platform_device *cpufreq_dt_pdev, *sun50i_cpufreq_pdev;
 
 struct sunxi_cpufreq_data {
@@ -45,6 +48,23 @@ static u32 sun50i_h6_efuse_xlate(u32 speedbin)
 		return 0;
 }
 
+static u32 sun50i_a100_efuse_xlate(u32 speedbin)
+{
+	u32 efuse_value;
+
+	efuse_value = (speedbin >> SUN50I_A100_NVMEM_SHIFT) &
+		      SUN50I_A100_NVMEM_MASK;
+
+	switch (efuse_value) {
+	case 0b100:
+		return 2;
+	case 0b010:
+		return 1;
+	default:
+		return 0;
+	}
+}
+
 static int get_soc_id_revision(void)
 {
 #ifdef CONFIG_HAVE_ARM_SMCCC_DISCOVERY
@@ -108,6 +128,10 @@ static struct sunxi_cpufreq_data sun50i_h6_cpufreq_data = {
 	.efuse_xlate = sun50i_h6_efuse_xlate,
 };
 
+static struct sunxi_cpufreq_data sun50i_a100_cpufreq_data = {
+	.efuse_xlate = sun50i_a100_efuse_xlate,
+};
+
 static struct sunxi_cpufreq_data sun50i_h616_cpufreq_data = {
 	.efuse_xlate = sun50i_h616_efuse_xlate,
 };
@@ -116,6 +140,9 @@ static const struct of_device_id cpu_opp_match_list[] = {
 	{ .compatible = "allwinner,sun50i-h6-operating-points",
 	  .data = &sun50i_h6_cpufreq_data,
 	},
+	{ .compatible = "allwinner,sun50i-a100-operating-points",
+	  .data = &sun50i_a100_cpufreq_data,
+	},
 	{ .compatible = "allwinner,sun50i-h616-operating-points",
 	  .data = &sun50i_h616_cpufreq_data,
 	},
@@ -291,6 +318,7 @@ static struct platform_driver sun50i_cpufreq_driver = {
 
 static const struct of_device_id sun50i_cpufreq_match_list[] = {
 	{ .compatible = "allwinner,sun50i-h6" },
+	{ .compatible = "allwinner,sun50i-a100" },
 	{ .compatible = "allwinner,sun50i-h616" },
 	{ .compatible = "allwinner,sun50i-h618" },
 	{ .compatible = "allwinner,sun50i-h700" },
-- 
2.47.0