linux-kernel - [PATCH 3/4] nvmem: mtk-efuse: support minimum one byte access stride and granularity

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Message-Id: <20211209174235.14049-4-srinivas.kandagatla@linaro.org>
Date:   Thu,  9 Dec 2021 17:42:34 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH 3/4] nvmem: mtk-efuse: support minimum one byte access stride and granularity

From: Chunfeng Yun <chunfeng.yun@...iatek.com>

In order to support nvmem bits property, should support minimum 1 byte
read stride and minimum 1 byte read granularity at the same time.

Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/nvmem/mtk-efuse.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/nvmem/mtk-efuse.c b/drivers/nvmem/mtk-efuse.c
index 6a537d959f14..e9a375dd84af 100644
--- a/drivers/nvmem/mtk-efuse.c
+++ b/drivers/nvmem/mtk-efuse.c
@@ -19,11 +19,12 @@ static int mtk_reg_read(void *context,
 			unsigned int reg, void *_val, size_t bytes)
 {
 	struct mtk_efuse_priv *priv = context;
-	u32 *val = _val;
-	int i = 0, words = bytes / 4;
+	void __iomem *addr = priv->base + reg;
+	u8 *val = _val;
+	int i;
 
-	while (words--)
-		*val++ = readl(priv->base + reg + (i++ * 4));
+	for (i = 0; i < bytes; i++, val++)
+		*val = readb(addr + i);
 
 	return 0;
 }
@@ -45,8 +46,8 @@ static int mtk_efuse_probe(struct platform_device *pdev)
 	if (IS_ERR(priv->base))
 		return PTR_ERR(priv->base);
 
-	econfig.stride = 4;
-	econfig.word_size = 4;
+	econfig.stride = 1;
+	econfig.word_size = 1;
 	econfig.reg_read = mtk_reg_read;
 	econfig.size = resource_size(res);
 	econfig.priv = priv;
-- 
2.21.0