linux-kernel - [PATCH] nvmem: sc27xx: add sc2730 efuse support

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Message-Id: <20200615032347.10586-1-zhang.lyra@gmail.com>
Date:   Mon, 15 Jun 2020 11:23:47 +0800
From:   Chunyan Zhang <zhang.lyra@...il.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     linux-kernel@...r.kernel.org, Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang7@...il.com>,
        Chunyan Zhang <chunyan.zhang@...soc.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Freeman Liu <freeman.liu@...soc.com>
Subject: [PATCH] nvmem: sc27xx: add sc2730 efuse support

From: Freeman Liu <freeman.liu@...soc.com>

Add support to the new efuse IP which is integrated in the SC2730
which includes multiple blocks in a single chip.

Signed-off-by: Freeman Liu <freeman.liu@...soc.com>
Signed-off-by: Chunyan Zhang <chunyan.zhang@...soc.com>
---
 drivers/nvmem/sc27xx-efuse.c | 34 +++++++++++++++++++++++++++++++---
 1 file changed, 31 insertions(+), 3 deletions(-)

diff --git a/drivers/nvmem/sc27xx-efuse.c b/drivers/nvmem/sc27xx-efuse.c
index ab5e7e0bc3d8..7d453c9d80da 100644
--- a/drivers/nvmem/sc27xx-efuse.c
+++ b/drivers/nvmem/sc27xx-efuse.c
@@ -4,12 +4,14 @@
 #include <linux/hwspinlock.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/nvmem-provider.h>
 
 /* PMIC global registers definition */
 #define SC27XX_MODULE_EN		0xc08
+#define SC2730_MODULE_EN		0x1808
 #define SC27XX_EFUSE_EN			BIT(6)
 
 /* Efuse controller registers definition */
@@ -49,12 +51,29 @@
 #define SC27XX_EFUSE_POLL_TIMEOUT	3000000
 #define SC27XX_EFUSE_POLL_DELAY_US	10000
 
+/*
+ * Since different PMICs of SC27xx series can have different
+ * address , we should save address in the device data structure.
+ */
+struct sc27xx_efuse_variant_data {
+	u32 module_en;
+};
+
 struct sc27xx_efuse {
 	struct device *dev;
 	struct regmap *regmap;
 	struct hwspinlock *hwlock;
 	struct mutex mutex;
 	u32 base;
+	const struct sc27xx_efuse_variant_data *var_data;
+};
+
+static const struct sc27xx_efuse_variant_data sc2731_edata = {
+	.module_en = SC27XX_MODULE_EN,
+};
+
+static const struct sc27xx_efuse_variant_data sc2730_edata = {
+	.module_en = SC2730_MODULE_EN,
 };
 
 /*
@@ -119,7 +138,7 @@ static int sc27xx_efuse_read(void *context, u32 offset, void *val, size_t bytes)
 		return ret;
 
 	/* Enable the efuse controller. */
-	ret = regmap_update_bits(efuse->regmap, SC27XX_MODULE_EN,
+	ret = regmap_update_bits(efuse->regmap, efuse->var_data->module_en,
 				 SC27XX_EFUSE_EN, SC27XX_EFUSE_EN);
 	if (ret)
 		goto unlock_efuse;
@@ -169,7 +188,7 @@ static int sc27xx_efuse_read(void *context, u32 offset, void *val, size_t bytes)
 
 disable_efuse:
 	/* Disable the efuse controller after reading. */
-	regmap_update_bits(efuse->regmap, SC27XX_MODULE_EN, SC27XX_EFUSE_EN, 0);
+	regmap_update_bits(efuse->regmap, efuse->var_data->module_en, SC27XX_EFUSE_EN, 0);
 unlock_efuse:
 	sc27xx_efuse_unlock(efuse);
 
@@ -187,8 +206,15 @@ static int sc27xx_efuse_probe(struct platform_device *pdev)
 	struct nvmem_config econfig = { };
 	struct nvmem_device *nvmem;
 	struct sc27xx_efuse *efuse;
+	const struct sc27xx_efuse_variant_data *pdata;
 	int ret;
 
+	pdata = of_device_get_match_data(&pdev->dev);
+	if (!pdata) {
+		dev_err(&pdev->dev, "No matching driver data found\n");
+		return -EINVAL;
+	}
+
 	efuse = devm_kzalloc(&pdev->dev, sizeof(*efuse), GFP_KERNEL);
 	if (!efuse)
 		return -ENOMEM;
@@ -219,6 +245,7 @@ static int sc27xx_efuse_probe(struct platform_device *pdev)
 
 	mutex_init(&efuse->mutex);
 	efuse->dev = &pdev->dev;
+	efuse->var_data = pdata;
 
 	econfig.stride = 1;
 	econfig.word_size = 1;
@@ -238,7 +265,8 @@ static int sc27xx_efuse_probe(struct platform_device *pdev)
 }
 
 static const struct of_device_id sc27xx_efuse_of_match[] = {
-	{ .compatible = "sprd,sc2731-efuse" },
+	{ .compatible = "sprd,sc2731-efuse", .data = &sc2731_edata},
+	{ .compatible = "sprd,sc2730-efuse", .data = &sc2730_edata},
 	{ }
 };
 
-- 
2.20.1