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Date: Sat, 4 Apr 2020 20:02:08 -0600
From: Rob Herring <robh@...nel.org>
To: Alim Akhtar <alim.akhtar@...sung.com>
Cc: devicetree@...r.kernel.org, linux-scsi@...r.kernel.org,
krzk@...nel.org, avri.altman@....com, martin.petersen@...cle.com,
kwmad.kim@...sung.com, stanley.chu@...iatek.com,
cang@...eaurora.org, linux-samsung-soc@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/5] Documentation: devicetree: ufs: Add DT bindings
for exynos UFS host controller
On Fri, Mar 27, 2020 at 10:36:36PM +0530, Alim Akhtar wrote:
> This adds Exynos Universal Flash Storage (UFS) Host Controller DT bindings.
Why the inconsistent subject. 'dt-bindings: ...' please.
>
> Signed-off-by: Seungwon Jeon <essuuj@...il.com>
> Signed-off-by: Alim Akhtar <alim.akhtar@...sung.com>
> ---
> .../devicetree/bindings/ufs/ufs-exynos.txt | 104 ++++++++++++++++++
> 1 file changed, 104 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/ufs/ufs-exynos.txt
Use DT schema format. Not sure why you'd do that for one and not the
other...
>
> diff --git a/Documentation/devicetree/bindings/ufs/ufs-exynos.txt b/Documentation/devicetree/bindings/ufs/ufs-exynos.txt
> new file mode 100644
> index 000000000000..08e2d1497b1b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/ufs/ufs-exynos.txt
> @@ -0,0 +1,104 @@
> +* Exynos Universal Flash Storage (UFS) Host Controller
> +
> +UFSHC nodes are defined to describe on-chip UFS host controllers.
> +Each UFS controller instance should have its own node.
> +
> +Required properties:
> +- compatible : compatible name, contains "samsung,exynos7-ufs"
> +- interrupts : <interrupt mapping for UFS host controller IRQ>
> +- reg : Should contain HCI, vendor specific, UNIPRO and
> + UFS protector address space
> +- reg-names : "hci", "vs_hci", "unipro", "ufsp";
> +
> +Optional properties:
> +- vdd-hba-supply : phandle to UFS host controller supply regulator node
> +- vcc-supply : phandle to VCC supply regulator node
> +- vccq-supply : phandle to VCCQ supply regulator node
> +- vccq2-supply : phandle to VCCQ2 supply regulator node
> +- vcc-supply-1p8 : For embedded UFS devices, valid VCC range is 1.7-1.95V
> + or 2.7-3.6V. This boolean property when set, specifies
> + to use low voltage range of 1.7-1.95V. Note for external
> + UFS cards this property is invalid and valid VCC range is
> + always 2.7-3.6V.
The supply for vcc-supply should be restricted to the valid range and
this is not needed.
> +- vcc-max-microamp : specifies max. load that can be drawn from vcc supply
> +- vccq-max-microamp : specifies max. load that can be drawn from vccq supply
> +- vccq2-max-microamp : specifies max. load that can be drawn from vccq2 supply
How is this information useful?
> +- <name>-fixed-regulator : boolean property specifying that <name>-supply is a fixed regulator
No need for this. Look up the phandle and check supply's node if you
want to know this.
> +
> +- clocks : List of phandle and clock specifier pairs
> +- clock-names : List of clock input name strings sorted in the same
> + order as the clocks property.
> + "core", "sclk_unipro_main", "ref" and ref_parent
> +
> +- freq-table-hz : Array of <min max> operating frequencies stored in the same
> + order as the clocks property. If this property is not
> + defined or a value in the array is "0" then it is assumed
> + that the frequency is set by the parent clock or a
> + fixed rate clock source.
> +- pclk-freq-avail-range : specifies available frequency range(min/max) for APB clock
> +- ufs,pwr-attr-mode : specifies mode value for power mode change, possible values are
> + "FAST", "SLOW", "FAST_auto" and "SLOW_auto"
Anything before the ',' is considered a vendor prefix and 'ufs' is not a
vendor.
If these are standard UFS properties, then they should be documented in
a common UFS binding. On the flip side, none of the other UFS bindings
have needed these properties, so why do you?
> +- ufs,pwr-attr-lane : specifies lane count value for power mode change
> + allowed values are 1 or 2
> +- ufs,pwr-attr-gear : specifies gear count value for power mode change
> + allowed values are 1 or 2
> +- ufs,pwr-attr-hs-series : specifies HS rate series for power mode change
> + can be one of "HS_rate_b" or "HS_rate_a"
> +- ufs,pwr-local-l2-timer : specifies array of local UNIPRO L2 timer values
> + 3 timers supported
> + <FC0ProtectionTimeOutVal,TC0ReplayTimeOutVal, AFC0ReqTimeOutVal>
> +- ufs,pwr-remote-l2-timer : specifies array of remote UNIPRO L2 timer values
> + 3 timers supported
> + <FC0ProtectionTimeOutVal,TC0ReplayTimeOutVal, AFC0ReqTimeOutVal>
> +- ufs-rx-adv-fine-gran-sup_en : specifies support of fine granularity of MPHY,
> + this is a boolean property.
> +- ufs-rx-adv-fine-gran-step : specifies granularity steps of MPHY,
> + allowed step size is 0 to 3
> +- ufs-rx-adv-min-activate-time-cap : specifies rx advanced minimum activate time of MPHY
> + range is 1 to 9
> +- ufs-pa-granularity : specifies Granularity for PA_TActivate and PA_Hibern8Time
> +- ufs-pa-tacctivate : specifies time to wake-up remote M-RX
> +- ufs-pa-hibern8time : specifies minimum time to wait in HIBERN8 state
> +
> +Note: If above properties are not defined it can be assumed that the supply
> +regulators or clocks are always on.
> +
> +Example:
> + ufshc@...5570000 {
> + compatible = "samsung,exynos7-ufs";
> + reg = <0x15570000 0x100>,
> + <0x15570100 0x100>,
> + <0x15571000 0x200>,
> + <0x15572000 0x300>;
> + reg-names = "hci", "vs_hci", "unipro", "ufsp";
> + interrupts = <0 200 0>;
> +
> + vdd-hba-supply = <&xxx_reg0>;
> + vdd-hba-fixed-regulator;
> + vcc-supply = <&xxx_reg1>;
> + vcc-supply-1p8;
> + vccq-supply = <&xxx_reg2>;
> + vccq2-supply = <&xxx_reg3>;
> + vcc-max-microamp = 500000;
> + vccq-max-microamp = 200000;
> + vccq2-max-microamp = 200000;
> +
> + clocks = <&core 0>, <&ref 0>, <&iface 0>;
> + clock-names = "core", "sclk_unipro_main", "ref", "ref_parent";
> + freq-table-hz = <100000000 200000000>, <0 0>, <0 0>, <0 0>;
> +
> + pclk-freq-avail-range = <70000000 133000000>;
> +
> + ufs,pwr-attr-mode = "FAST";
> + ufs,pwr-attr-lane = <2>;
> + ufs,pwr-attr-gear = <2>;
> + ufs,pwr-attr-hs-series = "HS_rate_b";
> + ufs,pwr-local-l2-timer = <8000 28000 20000>;
> + ufs,pwr-remote-l2-timer = <12000 32000 16000>;
> + 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 = <6>;
> + ufs-pa-hibern8time = <20>;
> + };
> --
> 2.17.1
>
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