nvmem: mtk-efuse: support minimum one byte access stride and granularity

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@mediatek.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20211209174235.14049-4-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/nvmem/mtk-efuse.c b/drivers/nvmem/mtk-efuse.c
index 6a537d9..e9a375d 100644 (file)
--- 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;