Re: [PATCH] Input: imx6ul_tsc - generalize the averaging property

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On 13/12/2016 21:54, Rob Herring wrote:

On Sun, Dec 11, 2016 at 1:06 AM, Guy Shapiro <guy.shapiro@xxxxxxxxxxxxx> wrote:
Make the avarage-samples property a general touchscreen property
rather than imx6ul device specific.

Signed-off-by: Guy Shapiro <guy.shapiro@xxxxxxxxxxxxx>
---
  .../bindings/input/touchscreen/imx6ul_tsc.txt      | 11 ++----
  .../bindings/input/touchscreen/touchscreen.txt     |  3 ++
  drivers/input/touchscreen/imx6ul_tsc.c             | 46 ++++++++++++++++------
  3 files changed, 41 insertions(+), 19 deletions(-)
[...]

+       switch (average_samples) {
+       case 1:
+               tsc->average_enable = false;
+               tsc->average_select = 0; /* value unused; initialize anyway */
+               break;
+       case 4:
+               tsc->average_enable = true;
+               tsc->average_select = 0;
+               break;
+       case 8:
+               tsc->average_enable = true;
+               tsc->average_select = 1;
+               break;
+       case 16:
+               tsc->average_enable = true;
+               tsc->average_select = 2;
+               break;
+       case 32:
+               tsc->average_enable = true;
+               tsc->average_select = 3;
+               break;
This could be more efficiently written as

tsc->average_select = log2(average_samples) - 2;

Then enable if >=0.

Using '1' to indicate no averaging is more consistent then using '0'.
I think it is better to validate the values rather then round them.

What do you think about:
+       switch (average_samples) {
+       case 1:
+               tsc->average_enable = false;
+ tsc->average_select = 0; /* value unused; initialize anyway */
+               break;
+       case 4:
+       case 8:
+       case 16:
+       case 32:
+               tsc->average_enable = true;
+               tsc->average_select = ilog2(average_samples) - 2;
+               break;
+       default:
+               dev_err(&pdev->dev,
+ "touchscreen-average-samples (%u) must be 1, 4, 8, 16 or 32\n",
+                       average_samples);

Guy.
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