diff mbox series

[v15,22/32] ARM: dts: aspeed: yosemite4: Revise i2c duty-cycle

Message ID 20240906062701.37088-23-Delphine_CC_Chiu@wiwynn.com
State New
Headers show
Series Add i2c-mux and eeprom devices for Meta Yosemite 4 | expand

Commit Message

Delphine CC Chiu Sept. 6, 2024, 6:26 a.m. UTC 
Revise duty cycle SMB11 and SMB16 to high: 40%, low: 60%,
to meet 400kHz-i2c clock low time spec (> 1.3 us) from EE request

Signed-off-by: Delphine CC Chiu <Delphine_CC_Chiu@wiwynn.com>
---
 arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite4.dts | 2 ++
 1 file changed, 2 insertions(+)

Comments

Geert Uytterhoeven Sept. 6, 2024, 7:42 a.m. UTC | #1 
Hi Delphine,

On Fri, Sep 6, 2024 at 8:28 AM Delphine CC Chiu
<Delphine_CC_Chiu@wiwynn.com> wrote:
> Revise duty cycle SMB11 and SMB16 to high: 40%, low: 60%,
> to meet 400kHz-i2c clock low time spec (> 1.3 us) from EE request
>
> Signed-off-by: Delphine CC Chiu <Delphine_CC_Chiu@wiwynn.com>

Thanks for your patch!

> --- a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite4.dts
> +++ b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite4.dts
> @@ -761,6 +761,7 @@ eeprom@54 {
>  &i2c10 {
>         status = "okay";
>         bus-frequency = <400000>;
> +       i2c-clk-high-min-percent = <40>;

This property is documented nowhere, except for a not-yet-accepted
patch submission in 2022. It looks like you've been told before, multiple
times...

>         i2c-mux@74 {
>                 compatible = "nxp,pca9544";
>                 i2c-mux-idle-disconnect;

Gr{oetje,eeting}s,

                        Geert


--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
diff mbox series

Patch

diff --git a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite4.dts b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite4.dts
index c2994651e747..c940d23c8a4b 100644
--- a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite4.dts
+++ b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite4.dts
@@ -761,6 +761,7 @@  eeprom@54 {
 &i2c10 {
 	status = "okay";
 	bus-frequency = <400000>;
+	i2c-clk-high-min-percent = <40>;
 	i2c-mux@74 {
 		compatible = "nxp,pca9544";
 		i2c-mux-idle-disconnect;
@@ -1314,6 +1315,7 @@  &i2c15 {
 	mctp-controller;
 	multi-master;
 	bus-frequency = <400000>;
+	i2c-clk-high-min-percent = <40>;
 
 	mctp@10 {
 		compatible = "mctp-i2c-controller";