On Tue, 2021-07-13 at 15:17 +0800, Chen-Yu Tsai wrote:

Hi,

On Sat, Jul 10, 2021 at 4:17 PM Zhiyong Tao [off-list ref] wrote:

quoted

This patch adds rsel define for mt8195.

Signed-off-by: Zhiyong Tao <redacted>
---
 include/dt-bindings/pinctrl/mt65xx.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/dt-bindings/pinctrl/mt65xx.h b/include/dt-bindings/pinctrl/mt65xx.h
index 7e16e58fe1f7..f5934abcd1bd 100644
--- a/include/dt-bindings/pinctrl/mt65xx.h
+++ b/include/dt-bindings/pinctrl/mt65xx.h

@@ -16,6 +16,15 @@
 #define MTK_PUPD_SET_R1R0_10 102
 #define MTK_PUPD_SET_R1R0_11 103

+#define MTK_PULL_SET_RSEL_000  200
+#define MTK_PULL_SET_RSEL_001  201
+#define MTK_PULL_SET_RSEL_010  202
+#define MTK_PULL_SET_RSEL_011  203
+#define MTK_PULL_SET_RSEL_100  204
+#define MTK_PULL_SET_RSEL_101  205
+#define MTK_PULL_SET_RSEL_110  206
+#define MTK_PULL_SET_RSEL_111  207
+

Instead of all the obscure macros and the new custom "rsel" property,
which BTW is not in the bindings, can't we just list the actual bias
resistance of each setting? We could also migrate away from R1R0.

==>Hi Chenyu,
The rsel actual bias resistance of each setting:

MTK_PULL_SET_RSEL_000:75K in PU, 75k in PD;
MTK_PULL_SET_RSEL_001:10k in PU, 5k in PD;
MTK_PULL_SET_RSEL_010:5k in PU, 75k in PD;
MTK_PULL_SET_RSEL_011:4k in PU, 5K in PD;
MTK_PULL_SET_RSEL_100:3k in PU, 75k in PD;
MTK_PULL_SET_RSEL_101:2k in PU, 5K in PD;
MTK_PULL_SET_RSEL_110:1.5k in PU, 75k in PD;
MTK_PULL_SET_RSEL_111:1k in PU, 5k in PD.

The rsel actual bias resistance is different between PU and PD.

Then we can specify the setting with the standard bias-pull-up/down
properties [1].

Also, please ask internally if Mediatek could relicense all the header
files that Mediatek has contributed under include/dt-bindings/pinctrl/ [2]
to GPL-2.0 and BSD dual license. These files are part of the DT bindings
and we really want them to be dual licensed as well, and not just the
YAML files.

==> We will confirm it internally and reply it later.

Thanks.

Regards
ChenYu


[1] https://elixir.bootlin.com/linux/latest/source/Documentation/devicetree/bindings/pinctrl/pincfg-node.yaml#L37
[2] Note that a few files were contributed by other people

quoted

 #define MTK_DRIVE_2mA  2
 #define MTK_DRIVE_4mA  4
 #define MTK_DRIVE_6mA  6
--
2.18.0
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