nvmem: meson-efuse: add write support

Add write support to the meson-gx efuse driver.
Beware, this efuse is one time programmable !

Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/nvmem/meson-efuse.c b/drivers/nvmem/meson-efuse.c
index 4623249dfd87947a63f8626a1c9a8177ab4ce63f..d769840d1e183a607e4e020660592c79512985dd 100644 (file)
--- a/drivers/nvmem/meson-efuse.c
+++ b/drivers/nvmem/meson-efuse.c
@@ -28,6 +28,13 @@ static int meson_efuse_read(void *context, unsigned int offset,
                                  bytes, 0, 0, 0);
 }
 
+static int meson_efuse_write(void *context, unsigned int offset,
+                            void *val, size_t bytes)
+{
+       return meson_sm_call_write((u8 *)val, bytes, SM_EFUSE_WRITE, offset,
+                                  bytes, 0, 0, 0);
+}
+
 static const struct of_device_id meson_efuse_match[] = {
        { .compatible = "amlogic,meson-gxbb-efuse", },
        { /* sentinel */ },
@@ -52,8 +59,8 @@ static int meson_efuse_probe(struct platform_device *pdev)
        econfig->name = dev_name(dev);
        econfig->stride = 1;
        econfig->word_size = 1;
-       econfig->read_only = true;
        econfig->reg_read = meson_efuse_read;
+       econfig->reg_write = meson_efuse_write;
        econfig->size = size;
 
        nvmem = devm_nvmem_register(&pdev->dev, econfig);