* [PATCH linux dev-4.10 v2] dts: add aspeed-pwm-tacho to msn dts.
@ 2017-08-29 15:22 Mykola Kostenok
2017-08-30 5:08 ` Andrew Jeffery
0 siblings, 1 reply; 2+ messages in thread
From: Mykola Kostenok @ 2017-08-29 15:22 UTC (permalink / raw)
To: Joel Stanley, Andrew Jeffery, openbmc
Cc: Mykola Kostenok, Vadim Pasternak, Ohad Oz
Add basic pwm-tacho-controller node to ast-g5 dtsi.
Add pwm-tacho to aspeed-bmc-mellanox-msn.dts.
Signed-off-by: Mykola Kostenok <c_mykolak@mellanox.com>
--
v1 -> v2:
Pointed out by Andrew Jeffery:
- rebased.
- remove exist #size-cells and #adress-cells in dtsi from dts.
---
arch/arm/boot/dts/aspeed-bmc-mellanox-msn.dts | 47 +++++++++++++++++++++++++++
arch/arm/boot/dts/aspeed-g5.dtsi | 17 ++++++++++
2 files changed, 64 insertions(+)
diff --git a/arch/arm/boot/dts/aspeed-bmc-mellanox-msn.dts b/arch/arm/boot/dts/aspeed-bmc-mellanox-msn.dts
index 0774959b1222..b7854e36f052 100644
--- a/arch/arm/boot/dts/aspeed-bmc-mellanox-msn.dts
+++ b/arch/arm/boot/dts/aspeed-bmc-mellanox-msn.dts
@@ -139,3 +139,50 @@
status = "okay";
};
+&pwm_tacho {
+ status = "okay";
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_pwm0_default>;
+ #cooling-cells = <2>;
+
+ cooling: fan@0 {
+ reg = <0x00>;
+ cooling-levels = /bits/ 8 <125 151 177 203 229 255>;
+ aspeed,fan-tach-ch = /bits/ 8 <0x00>;
+ };
+
+ fan@1 {
+ reg = <0x00>;
+ aspeed,fan-tach-ch = /bits/ 8 <0x01>;
+ };
+
+ fan@2 {
+ reg = <0x00>;
+ aspeed,fan-tach-ch = /bits/ 8 <0x02>;
+ };
+
+ fan@3 {
+ reg = <0x00>;
+ aspeed,fan-tach-ch = /bits/ 8 <0x03>;
+ };
+
+ fan@4 {
+ reg = <0x00>;
+ aspeed,fan-tach-ch = /bits/ 8 <0x04>;
+ };
+
+ fan@5 {
+ reg = <0x00>;
+ aspeed,fan-tach-ch = /bits/ 8 <0x05>;
+ };
+
+ fan@6 {
+ reg = <0x00>;
+ aspeed,fan-tach-ch = /bits/ 8 <0x06>;
+ };
+
+ fan@7 {
+ reg = <0x00>;
+ aspeed,fan-tach-ch = /bits/ 8 <0x07>;
+ };
+};
diff --git a/arch/arm/boot/dts/aspeed-g5.dtsi b/arch/arm/boot/dts/aspeed-g5.dtsi
index cdea4f4eb77c..bb7652a61bec 100644
--- a/arch/arm/boot/dts/aspeed-g5.dtsi
+++ b/arch/arm/boot/dts/aspeed-g5.dtsi
@@ -41,6 +41,14 @@
serial5 = &vuart;
};
+ clocks {
+ pwm_tacho_fixed_clk: fixedclk {
+ compatible = "fixed-clock";
+ #clock-cells = <0>;
+ clock-frequency = <24000000>;
+ };
+ };
+
ahb {
compatible = "simple-bus";
#address-cells = <1>;
@@ -373,6 +381,15 @@
#size-cells = <1>;
ranges = <0 0x1e78a000 0x1000>;
};
+
+ pwm_tacho: pwm-tacho-controller@1e786000 {
+ compatible = "aspeed,ast2500-pwm-tacho";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <0x1e786000 0x1000>;
+ clocks = <&pwm_tacho_fixed_clk>;
+ status = "disabled";
+ };
};
};
};
--
2.11.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH linux dev-4.10 v2] dts: add aspeed-pwm-tacho to msn dts.
2017-08-29 15:22 [PATCH linux dev-4.10 v2] dts: add aspeed-pwm-tacho to msn dts Mykola Kostenok
@ 2017-08-30 5:08 ` Andrew Jeffery
0 siblings, 0 replies; 2+ messages in thread
From: Andrew Jeffery @ 2017-08-30 5:08 UTC (permalink / raw)
To: Mykola Kostenok, Joel Stanley, openbmc; +Cc: Vadim Pasternak, Ohad Oz
[-- Attachment #1: Type: text/plain, Size: 4536 bytes --]
Hi Mykola
On Tue, 2017-08-29 at 18:22 +0300, Mykola Kostenok wrote:
> Add basic pwm-tacho-controller node to ast-g5 dtsi.
>
> Add pwm-tacho to aspeed-bmc-mellanox-msn.dts.
A couple of points I should have addressed in my previous reply (but
didn't so I won't burden you with them now):
* This should be split into two patches, one adding the necessary nodes
to aspeed-g5.dtsi (a general capability), and the second adding the
nodes to aspeed-bmc-mellanox-msn.dts (machine-specific configuration).
* Describe the tricky bits of the patch in the commit message. For
instance, the non-obvious backwards nature of the bindings means weird
semantics for the reg property in the fan nodes. Also, a bit of
information on your fan topology (driving the 8 fans from one PWM)
would be good.
Generally in commit messages I look for descriptions of the motivation
for the patch (why), not the content of the change (how/what): The diff
itself describes how/what. Adding the answer to 'why' in the commit
message helps others to evaluate whether the implementation is the
right way to go. Otherwise we're stuck reverse-engineering your intent
from your implementation, which is a bit of a hindrance to identifying
bugs or better approaches.
Talking about implementations you tried and found not to work is also very
useful as it will put a stop to reviewers exploring and suggesting these
dead-ends themselves. This point is not applicable to your patch here as you
are modifying a devicetree (which is declarative, not imperative), but is
useful to keep in mind.
Anyway, thanks for the change, I've applied it to dev-4.10 with some
modifications to the commit message to address the points above. I'll take the
conversations about the bindings upstream.
Andrew
>
> > Signed-off-by: Mykola Kostenok <c_mykolak@mellanox.com>
> --
> v1 -> v2:
> Pointed out by Andrew Jeffery:
> - rebased.
> - remove exist #size-cells and #adress-cells in dtsi from dts.
> ---
> arch/arm/boot/dts/aspeed-bmc-mellanox-msn.dts | 47 +++++++++++++++++++++++++++
> arch/arm/boot/dts/aspeed-g5.dtsi | 17 ++++++++++
> 2 files changed, 64 insertions(+)
>
> diff --git a/arch/arm/boot/dts/aspeed-bmc-mellanox-msn.dts b/arch/arm/boot/dts/aspeed-bmc-mellanox-msn.dts
> index 0774959b1222..b7854e36f052 100644
> --- a/arch/arm/boot/dts/aspeed-bmc-mellanox-msn.dts
> +++ b/arch/arm/boot/dts/aspeed-bmc-mellanox-msn.dts
> @@ -139,3 +139,50 @@
> > status = "okay";
> };
>
> +&pwm_tacho {
> > + status = "okay";
> > + pinctrl-names = "default";
> > + pinctrl-0 = <&pinctrl_pwm0_default>;
> > + #cooling-cells = <2>;
> +
> > > + cooling: fan@0 {
> > + reg = <0x00>;
> > + cooling-levels = /bits/ 8 <125 151 177 203 229 255>;
> > + aspeed,fan-tach-ch = /bits/ 8 <0x00>;
> > + };
> +
> > + fan@1 {
> > + reg = <0x00>;
> > + aspeed,fan-tach-ch = /bits/ 8 <0x01>;
> > + };
> +
> > + fan@2 {
> > + reg = <0x00>;
> > + aspeed,fan-tach-ch = /bits/ 8 <0x02>;
> > + };
> +
> > + fan@3 {
> > + reg = <0x00>;
> > + aspeed,fan-tach-ch = /bits/ 8 <0x03>;
> > + };
> +
> > + fan@4 {
> > + reg = <0x00>;
> > + aspeed,fan-tach-ch = /bits/ 8 <0x04>;
> > + };
> +
> > + fan@5 {
> > + reg = <0x00>;
> > + aspeed,fan-tach-ch = /bits/ 8 <0x05>;
> > + };
> +
> > + fan@6 {
> > + reg = <0x00>;
> > + aspeed,fan-tach-ch = /bits/ 8 <0x06>;
> > + };
> +
> > + fan@7 {
> > + reg = <0x00>;
> > + aspeed,fan-tach-ch = /bits/ 8 <0x07>;
> > + };
> +};
> diff --git a/arch/arm/boot/dts/aspeed-g5.dtsi b/arch/arm/boot/dts/aspeed-g5.dtsi
> index cdea4f4eb77c..bb7652a61bec 100644
> --- a/arch/arm/boot/dts/aspeed-g5.dtsi
> +++ b/arch/arm/boot/dts/aspeed-g5.dtsi
> @@ -41,6 +41,14 @@
> > serial5 = &vuart;
> > };
>
> > + clocks {
> > + pwm_tacho_fixed_clk: fixedclk {
> > + compatible = "fixed-clock";
> > + #clock-cells = <0>;
> > + clock-frequency = <24000000>;
> > + };
> > + };
> +
> > ahb {
> > compatible = "simple-bus";
> > #address-cells = <1>;
> @@ -373,6 +381,15 @@
> > #size-cells = <1>;
> > ranges = <0 0x1e78a000 0x1000>;
> > };
> +
> > > + pwm_tacho: pwm-tacho-controller@1e786000 {
> > + compatible = "aspeed,ast2500-pwm-tacho";
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > + reg = <0x1e786000 0x1000>;
> > + clocks = <&pwm_tacho_fixed_clk>;
> > + status = "disabled";
> > + };
> > };
> > };
> };
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2017-08-29 15:22 [PATCH linux dev-4.10 v2] dts: add aspeed-pwm-tacho to msn dts Mykola Kostenok
2017-08-30 5:08 ` Andrew Jeffery
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