misc: Update read() and write() methods to return bytes xfered
At present these functions return 0 on success. For some devices we want
to know how many bytes were transferred. It seems useful to adjust the API
to be more like the POSIX read() and write() functions.
Update these two methods, a test and all users.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/drivers/clk/clk_vexpress_osc.c b/drivers/clk/clk_vexpress_osc.c
index 7fef4b2..c692a6d 100644
--- a/drivers/clk/clk_vexpress_osc.c
+++ b/drivers/clk/clk_vexpress_osc.c
@@ -29,7 +29,7 @@
data = CLK_FUNCTION | priv->osc;
err = misc_read(vexpress_cfg, 0, &data, sizeof(data));
- if (err)
+ if (err < 0)
return err;
return data;
@@ -53,7 +53,7 @@
buffer[0] = CLK_FUNCTION | priv->osc;
buffer[1] = rate;
err = misc_write(vexpress_cfg, 0, buffer, 2 * sizeof(u32));
- if (err)
+ if (err < 0)
return err;
return rate;