Hi,
On Mon, Jul 9, 2018 at 4:43 AM, Amit Kucheria <amit.kuche...@linaro.org> wrote:
> There are two banks of registers for v2 TSENS IPs: SROT and TM. On older
> SoCs these were contiguous, leading to DTs mapping them as one register
> address space of size 0x2000. In newer SoCs, these two banks are not
> contiguous anymore.
>
> Fixing old DTs to split the address space into allows us to have cleaner
> common code e.g. get_temp() that is shared across new and old platforms.
This makes it sound like old DTs won't be supported anymore. ...but
the code says otherwise. I'd just remove the above paragraph.
> @@ -126,11 +127,21 @@ static const struct regmap_config tsens_config = {
> int __init init_common(struct tsens_device *tmdev)
> {
> void __iomem *base;
> + struct platform_device *op =
> of_find_device_by_node(tmdev->dev->of_node);
>
> + if (!op)
> + return -EINVAL;
> base = of_iomap(tmdev->dev->of_node, 0);
> if (!base)
> return -EINVAL;
>
> + if (op->num_resources > 1) {
Maybe add a comment here that says that we don't actually map the SROT
yet because you don't read anything from there? I kept getting
confused about how this patch could possibly work with no code to map
SROT...
> + tmdev->tm_offset = 0;
> + } else {
> + /* old DTs where SROT and TM were in a contiguous 2K block */
> + tmdev->tm_offset = 0x1000;
This patch without patch #4 will break compatibility. You should
squash part of patch #4 into this one, specifically:
-#define STATUS_OFFSET 0x10a0
-#define LAST_TEMP_MASK 0xfff
+#define STATUS_OFFSET 0xa0
+#define LAST_TEMP_MASK 0xfff
Without that you break bisect-ability and also confuse anyone trying
to look at this patch.
-Doug
