linux-kernel - RE: [PATCH v7 08/10] dt-bindings: ufs: Add DT binding documentation for ufs

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Date:   Sat, 9 May 2020 06:08:45 +0530
From:   "Alim Akhtar" <alim.akhtar@...sung.com>
To:     "'Rob Herring'" <robh@...nel.org>
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 v7 08/10] dt-bindings: ufs: Add DT binding documentation
 for ufs

Hi Rob,

> -----Original Message-----
> From: Rob Herring <robh@...nel.org>
> Sent: 05 May 2020 21:29
> 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 v7 08/10] dt-bindings: ufs: Add DT binding
documentation
> for ufs
> 
> On Sun, Apr 26, 2020 at 11:00:22PM +0530, Alim Akhtar wrote:
> > This patch adds DT binding for samsung ufs hci
> >
> > Signed-off-by: Alim Akhtar <alim.akhtar@...sung.com>
> > ---
> >  .../bindings/ufs/samsung,exynos-ufs.yaml      | 93 +++++++++++++++++++
> >  1 file changed, 93 insertions(+)
> >  create mode 100644
> > Documentation/devicetree/bindings/ufs/samsung,exynos-ufs.yaml
> >
> > diff --git
> > a/Documentation/devicetree/bindings/ufs/samsung,exynos-ufs.yaml
> > b/Documentation/devicetree/bindings/ufs/samsung,exynos-ufs.yaml
> > new file mode 100644
> > index 000000000000..954338b7f37d
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/ufs/samsung,exynos-ufs.yaml
> > @@ -0,0 +1,93 @@
> > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause %YAML 1.2
> > +---
> > +$id:
> > +https://protect2.fireeye.com/url?k=0b9d9296-560b2be1-0b9c19d9-0cc47a3
> > +12ab0-
> 58b0bd73926e9ff6&q=1&u=http%3A%2F%2Fdevicetree.org%2Fschemas%2F
> > +ufs%2Fsamsung%2Cexynos-ufs.yaml%23
> > +$schema:
> > +https://protect2.fireeye.com/url?k=1fa0a694-42361fe3-1fa12ddb-0cc47a3
> > +12ab0-6911bcc836debe4d&q=1&u=http%3A%2F%2Fdevicetree.org%2Fmeta-
> schem
> > +as%2Fcore.yaml%23
> > +
> > +title: Samsung SoC series UFS host controller Device Tree Bindings
> > +
> > +maintainers:
> > +  - Alim Akhtar <alim.akhtar@...sung.com>
> > +
> > +description: |
> > +  Each Samsung UFS host controller instance should have its own node.
> > +  This binding define Samsung specific binding other then what is
> > +used
> > +  in the common ufshcd bindings
> > +  [1] Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
> > +
> > +properties:
> > +
> > +  compatible:
> > +    enum:
> > +      - samsung,exynos7-ufs
> > +
> > +  reg:
> > +    items:
> > +     - description: HCI register
> > +     - description: vendor specific register
> > +     - description: unipro register
> > +     - description: UFS protector register
> > +
> > +  reg-names:
> > +    items:
> > +      - const: hci
> > +      - const: vs_hci
> > +      - const: unipro
> > +      - const: ufsp
> > +
> > +  clocks:
> > +    maxItems: 2
> > +    items:
> > +      - description: ufs link core clock
> > +      - description: unipro main clock
> > +
> > +  clock-names:
> > +    maxItems: 2
> > +    items:
> > +      - const: core_clk
> > +      - const: sclk_unipro_main
> > +
> > +  interrupts:
> > +    items:
> > +      - description: interrupt signal for various ufshc status
> 
> Just 'maxItems: 1' is fine for single item cases.
> 
Sure will update
> > +
> > +  phys:
> > +    maxItems: 1
> > +    description:
> > +      phandle of the ufs phy node
> 
> Can drop description.
> 
Ack

> > +
> > +  phy-names:
> > +      const: ufs-phy
> 
> Not much point to a name when only 1 entry.
> 
You mean drop the phy-names property itself or just const: ufs-phy? And add
maxItems: 1

> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - interrupts
> > +  - phys
> > +  - phy-names
> > +  - clocks
> > +  - clock-names
> 
> additionalProperties: false
> 
Sure will add
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> > +    #include <dt-bindings/clock/exynos7-clk.h>
> > +
> > +    ufs: ufs@...70000 {
> > +       compatible = "samsung,exynos7-ufs";
> > +       reg = <0x15570000 0x100>,
> > +             <0x15570100 0x100>,
> > +             <0x15571000 0x200>,
> > +             <0x15572000 0x300>;
> > +       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";
> > +       pinctrl-names = "default";
> > +       pinctrl-0 = <&ufs_rst_n &ufs_refclk_out>;
> > +       pclk-freq-avail-range = <70000000 133000000>;
> > +       phys = <&ufs_phy>;
> > +       phy-names = "ufs-phy";
> > +    };
> > +...
> > --
> > 2.17.1
> >