linux-kernel - Re: [PATCHv3 2/5] ARM: dts: exynos: Add missing usbdrd3 suspend clk

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Date:   Sat, 14 Mar 2020 19:02:33 +0530
From:   Anand Moon <linux.amoon@...il.com>
To:     Linux USB Mailing List <linux-usb@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-samsung-soc@...r.kernel.org,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        "open list:COMMON CLK FRAMEWORK" <linux-clk@...r.kernel.org>
Cc:     Rob Herring <robh+dt@...nel.org>, Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Felipe Balbi <balbi@...nel.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Subject: Re: [PATCHv3 2/5] ARM: dts: exynos: Add missing usbdrd3 suspend clk

Hi Krzysztof,

On Wed, 11 Mar 2020 at 01:19, Anand Moon <linux.amoon@...il.com> wrote:
>
> Add new compatible strings for USBDRD3 for adding missing
> suspend clk, exynos5422 usbdrd3 support two clk USBD300 and
> SCLK_USBD300, so add missing suspemd_clk for Exynos542x DWC3 nodes.
>
> Signed-off-by: Anand Moon <linux.amoon@...il.com>

My assumption based on the FSYS clock source diagram below was bit wrong.
[0] https://imgur.com/gallery/zAiBoyh

And again re-looking into the driver source code, it turn out their
are *6 clock*
Here is the correct mapping as per the Exynos5420 clock driver.

USB-(phy@...00000)
|___________________CLK_SCLK_USBD300
|___________________CLK_SCLK_USBPHY300

USB-(phy@...00000)
|___________________CLK_SCLK_USBD301
|___________________CLK_SCLK_USBPHY301

USB-(dwc3@...00000)
|___________________CLK_USBD300
USB-(dwc3@...00000)
|___________________CLK_USBD301

Note: As per Exynos 5422 user manual, There are some more USB CLK
configuration missing in GATE_IP_FSYS. So we could enable another dwc3 clk,
If needed I would like too add this missing clk code and enable this
clk for dwc3 driver.

For some reason we already use CLK_USBD300 and CLK_USBD301
for PHY nodes, which lead to this confusion. So we need to update PHY clock
CLK_USBD300 with CLK_SCLK_USBD300 and clock CLK_USBD301 with CLK_SCLK_USBD301.

Please share your thought on linking PHY nodes above and add new DWC3 clock
and enable this clock.

-Anand

> ---
> fix the commit message
> ---
>  arch/arm/boot/dts/exynos5410.dtsi | 8 ++++----
>  arch/arm/boot/dts/exynos5420.dtsi | 8 ++++----
>  arch/arm/boot/dts/exynos54xx.dtsi | 4 ++--
>  3 files changed, 10 insertions(+), 10 deletions(-)
>
> diff --git a/arch/arm/boot/dts/exynos5410.dtsi b/arch/arm/boot/dts/exynos5410.dtsi
> index 2eab80bf5f3a..19845dcd528f 100644
> --- a/arch/arm/boot/dts/exynos5410.dtsi
> +++ b/arch/arm/boot/dts/exynos5410.dtsi
> @@ -396,8 +396,8 @@ &trng {
>  };
>
>  &usbdrd3_0 {
> -       clocks = <&clock CLK_USBD300>;
> -       clock-names = "usbdrd30";
> +       clocks = <&clock CLK_USBD300>, <&clock CLK_SCLK_USBD300>;
> +       clock-names = "usbdrd30", "usbdrd30_susp_clk";
>  };
>
>  &usbdrd_phy0 {
> @@ -407,8 +407,8 @@ &usbdrd_phy0 {
>  };
>
>  &usbdrd3_1 {
> -       clocks = <&clock CLK_USBD301>;
> -       clock-names = "usbdrd30";
> +       clocks = <&clock CLK_USBD301>, <&clock CLK_SCLK_USBD301>;
> +       clock-names = "usbdrd30", "usbdrd30_susp_clk";
>  };
>
>  &usbdrd_dwc3_1 {
> diff --git a/arch/arm/boot/dts/exynos5420.dtsi b/arch/arm/boot/dts/exynos5420.dtsi
> index b672080e7469..bd505256a223 100644
> --- a/arch/arm/boot/dts/exynos5420.dtsi
> +++ b/arch/arm/boot/dts/exynos5420.dtsi
> @@ -1372,8 +1372,8 @@ &trng {
>  };
>
>  &usbdrd3_0 {
> -       clocks = <&clock CLK_USBD300>;
> -       clock-names = "usbdrd30";
> +       clocks = <&clock CLK_USBD300>, <&clock CLK_SCLK_USBD300>;
> +       clock-names = "usbdrd30", "usbdrd30_susp_clk";
>  };
>
>  &usbdrd_phy0 {
> @@ -1383,8 +1383,8 @@ &usbdrd_phy0 {
>  };
>
>  &usbdrd3_1 {
> -       clocks = <&clock CLK_USBD301>;
> -       clock-names = "usbdrd30";
> +       clocks = <&clock CLK_USBD301>, <&clock CLK_SCLK_USBD301>;
> +       clock-names = "usbdrd30", "usbdrd30_susp_clk";
>  };
>
>  &usbdrd_dwc3_1 {
> diff --git a/arch/arm/boot/dts/exynos54xx.dtsi b/arch/arm/boot/dts/exynos54xx.dtsi
> index 8aa5117e58ce..0aac6255de5d 100644
> --- a/arch/arm/boot/dts/exynos54xx.dtsi
> +++ b/arch/arm/boot/dts/exynos54xx.dtsi
> @@ -143,7 +143,7 @@ hsi2c_7: i2c@...d0000 {
>                 };
>
>                 usbdrd3_0: usb3-0 {
> -                       compatible = "samsung,exynos5250-dwusb3";
> +                       compatible = "samsung,exynos5420-dwusb3";
>                         #address-cells = <1>;
>                         #size-cells = <1>;
>                         ranges;
> @@ -165,7 +165,7 @@ usbdrd_phy0: phy@...00000 {
>                 };
>
>                 usbdrd3_1: usb3-1 {
> -                       compatible = "samsung,exynos5250-dwusb3";
> +                       compatible = "samsung,exynos5420-dwusb3";
>                         #address-cells = <1>;
>                         #size-cells = <1>;
>                         ranges;
> --
> 2.25.1
>