From: Shuosheng Huang <huangshuosheng@allwinnertech.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@allwinnertech.com>
[masterr3c0rd@epochal.quest: add A100 to opp_match_list]
Signed-off-by: Cody Eksal <masterr3c0rd@epochal.quest>
---
 drivers/cpufreq/sun50i-cpufreq-nvmem.c | 28 ++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

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