Re: [PATCH v4 2/4] pinctrl: Add pinctrl binding for Broadcom Capri SoCs

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On 14-01-07 09:15 AM, Linus Walleij wrote:
On Sat, Dec 21, 2013 at 3:13 AM, Sherman Yin <syin@xxxxxxxxxxxx> wrote:
+Optional Properties (for standard pins):
+
+- function:                    String. Specifies the pin mux selection. Values
+                               must be one of: "alt1", "alt2", "alt3", "alt4"
+- input-schmitt-enable:                No arguments. Enable schmitt-trigger mode.
+- input-schmitt-disable:       No arguments. Disable schmitt-trigger mode.
+- bias-pull-up:                        No arguments. Pull up on pin.
+- bias-pull-down:              No arguments. Pull down on pin.
+- bias-disable:                        No arguments. Disable pin bias.
+- slew-rate:                   Integer. Meaning depends on configured pin mux:
+                               *_SCL or *_SDA:
+                                       0: Standard(100kbps)& Fast(400kbps) mode
+                                       1: Highspeed (3.4Mbps) mode
+                               IC_DM or IC_DP:
+                                       0: normal slew rate
+                                       1: fast slew rate
+                               Otherwise:
+                                       0: fast slew rate
+                                       1: normal slew rate
+- input-enable:                        No arguements. Enable input (does not affect
+                               output.)
+- input-disable:               No arguements. Disable input (does not affect
+                               output.)
+- drive-strength:              Integer. Drive strength in mA.  Valid values are
+                               2, 4, 6, 8, 10, 12, 14, 16 mA.

Also patch
Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
Since you're adding generic properties.

Please note that I removed from this patchset the patch that you've merged to your for-next branch already:

https://git.kernel.org/cgit/linux/kernel/git/linusw/linux-pinctrl.git/commit/?h=for-next&id=8ba3f4d00078e7a49c60c0bd6298f29402c3a0a0

Is that what you wanted to see in pinctrl-bindings.txt, or is there something else you want to see added to that txt file? I didn't want to add the description of slew-rate arguments there because this is capri-specific. I'm not quite sure what else to add.


+Optional Properties (for I2C pins):
+
+- function:                    String. Specifies the pin mux selection. Values
+                               must be one of: "alt1", "alt2", "alt3", "alt4"
+- bias-pull-up:                        Integer. Pull up strength in Ohm. There are 3
+                               pull-up resisitors (1.2k, 1.8k, 2.7k) available
+                               in parallel for I2C pins, so the valid values
+                               are: 568, 720, 831, 1080, 1200, 1800, 2700 Ohm.

Also patch
Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt

That doc already says bias-pull-up is specified in Ohm, and the specific values are chip-specific, so I don't think they should be mentioned there.

+- bias-disable:                        No arguments. Disable pin bias.
+- slew-rate:                   Integer. Meaning depends on configured pin mux:
+                               *_SCL or *_SDA:
+                                       0: Standard(100kbps)& Fast(400kbps) mode
+                                       1: Highspeed (3.4Mbps) mode
+                               IC_DM or IC_DP:
+                                       0: normal slew rate
+                                       1: fast slew rate
+                               Otherwise:
+                                       0: fast slew rate
+                                       1: normal slew rate

Hm that does not seem generic though, so let's not add this to the
generic bindings.

+- input-enable:                        No arguements. Enable input (does not affect
+                               output.)
+- input-disable:               No arguements. Disable input (does not affect
+                               output.)
+
+Optional Properties (for HDMI pins):
+
+- function:                    String. Specifies the pin mux selection. Values
+                               must be one of: "alt1", "alt2", "alt3", "alt4"
+- slew-rate:                   Integer. Controls slew rate.
+                                       0: Standard(100kbps)& Fast(400kbps) mode
+                                       1: Highspeed (3.4Mbps) mode

Hmmmm slew rate is not specifiec in "bps" but rather in
something like volts per second. But maybe it's best to keep
this value driver-specific.

Right, I think the slew-rates values are capri specific.

Thanks for the review.

Regards,
Sherman
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