Re: [PATCH v4 5/5] arm64: dts: Add node for ufs exynos7

["Paweł Chmiel" <pawel.mikolaj.chmiel@gmail.com>]

On Fri, 2020-03-27 at 22:36 +0530, Alim Akhtar wrote:
> Adding dt node foe UFS and UFS-PHY for exynos7 SoC.
> 
> Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
> ---
>  .../boot/dts/exynos/exynos7-espresso.dts      | 16 +++++++
>  arch/arm64/boot/dts/exynos/exynos7.dtsi       | 43 ++++++++++++++++++-
>  2 files changed, 57 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/exynos/exynos7-espresso.dts b/arch/arm64/boot/dts/exynos/exynos7-espresso.dts
> index 7af288fa9475..b59a0a32620a 100644
> --- a/arch/arm64/boot/dts/exynos/exynos7-espresso.dts
> +++ b/arch/arm64/boot/dts/exynos/exynos7-espresso.dts
> @@ -406,6 +406,22 @@
>  	};
>  };
>  
> +&ufs {
> +	status = "okay";
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&ufs_rst_n &ufs_refclk_out>;
> +	ufs,pwr-attr-mode = "FAST";
> +	ufs,pwr-attr-lane = <2>;
> +	ufs,pwr-attr-gear = <2>;
> +	ufs,pwr-attr-hs-series = "HS_rate_b";
> +	ufs-rx-adv-fine-gran-sup_en = <1>;
> +	ufs-rx-adv-fine-gran-step = <3>;
> +	ufs-rx-adv-min-activate-time-cap = <9>;
> +	ufs-pa-granularity = <6>;
> +	ufs-pa-tacctivate = <3>;
> +	ufs-pa-hibern8time = <20>;
> +};
> +
>  &usbdrd_phy {
>  	vbus-supply = <&usb30_vbus_reg>;
>  	vbus-boost-supply = <&usb3drd_boost_5v>;
> diff --git a/arch/arm64/boot/dts/exynos/exynos7.dtsi b/arch/arm64/boot/dts/exynos/exynos7.dtsi
> index 5558045637ac..9d16c90edd07 100644
> --- a/arch/arm64/boot/dts/exynos/exynos7.dtsi
> +++ b/arch/arm64/boot/dts/exynos/exynos7.dtsi
> @@ -220,9 +220,14 @@
>  			#clock-cells = <1>;
>  			clocks = <&fin_pll>, <&clock_top1 DOUT_ACLK_FSYS1_200>,
>  				 <&clock_top1 DOUT_SCLK_MMC0>,
> -				 <&clock_top1 DOUT_SCLK_MMC1>;
> +				 <&clock_top1 DOUT_SCLK_MMC1>,
> +				 <&clock_top1 DOUT_SCLK_UFSUNIPRO20>,
> +				 <&clock_top1 DOUT_SCLK_PHY_FSYS1>,
> +				 <&clock_top1 DOUT_SCLK_PHY_FSYS1_26M>;
>  			clock-names = "fin_pll", "dout_aclk_fsys1_200",
> -				      "dout_sclk_mmc0", "dout_sclk_mmc1";
> +				      "dout_sclk_mmc0", "dout_sclk_mmc1",
> +				      "dout_sclk_ufsunipro20", "dout_sclk_phy_fsys1",
> +				      "dout_sclk_phy_fsys1_26m";
>  		};
>  
>  		serial_0: serial@13630000 {
> @@ -601,6 +606,40 @@
>  			};
>  		};
>  
> +		ufs: ufs@15570000 {
> +			compatible = "samsung,exynos7-ufs";
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +			ranges;
> +			reg = <0x15570000 0x100>,  /* 0: HCI standard */
> +				<0x15570100 0x100>,  /* 1: Vendor specificed */
> +				<0x15571000 0x200>,  /* 2: UNIPRO */
> +				<0x15572000 0x300>;  /* 3: UFS protector */
> +			reg-names = "hci", "vs_hci", "unipro", "ufsp";
> +			interrupts = <GIC_SPI 200 IRQ_TYPE_LEVEL_HIGH>;
> +			clocks = <&clock_fsys1 ACLK_UFS20_LINK>,
> +				<&clock_fsys1 SCLK_UFSUNIPRO20_USER>;
> +			clock-names = "core_clk", "sclk_unipro_main";
> +			freq-table-hz = <0 0>, <0 0>;
> +			pclk-freq-avail-range = <70000000 133000000>;
> +			ufs,pwr-local-l2-timer = <8000 28000 20000>;
> +			ufs,pwr-remote-l2-timer = <12000 32000 16000>;
> +			phys = <&ufs_phy>;
> +			phy-names = "ufs-phy";
> +			status = "disabled";
> +		};
> +
> +		ufs_phy: ufs-phy@0x15571800 {
> +			compatible = "samsung,exynos7-ufs-phy";
> +			reg = <0x15571800 0x240>;
> +			reg-names = "phy-pma";
> +			samsung,pmu-syscon = <&pmu_system_controller>;
> +			#phy-cells = <0>;
> +			clocks = <&clock_fsys1 MOUT_FSYS1_PHYCLK_SEL1>,
> +				<&clock_top1 CLK_SCLK_PHY_FSYS1_26M>;
> +			clock-names = "ref_clk_parent", "ref_clk";
Hi
Is this correct (aren't child and parent clock swapped)?
This will set MOUT_FSYS1_PHYCLK_SEL1 to be parent clock of
CLK_SCLK_PHY_FSYS1_26M.
I've tested this on Exynos7420 (which looks like can use the same clock
driver as exynos7) and after adding some debug code (because currently
we're not handling result of samsung_ufs_phy_clks_init) i got

samsung-ufs-phy 15571800.ufs-phy: clk_set_parent result: -22

On vendor sources for this device, driver was setting
CLK_SCLK_PHY_FSYS1_26M to be parent of MOUT_FSYS1_PHYCLK_SEL1, and then
it did run without error.

samsung-ufs-phy 15571800.ufs-phy: clk_set_parent result: 0

Also looking at clk-exynos7 driver seems to confirm this.

> +		};
> +
>  		usbdrd_phy: phy@15500000 {
>  			compatible = "samsung,exynos7-usbdrd-phy";
>  			reg = <0x15500000 0x100>;