linux-kernel - Re: [PATCH v9 3/4] clk: meson: add DT documentation for emmc clock controller

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Date:   Fri, 14 Jan 2022 11:06:07 +0800
From:   Liang Yang <liang.yang@...ogic.com>
To:     Stephen Boyd <sboyd@...nel.org>,
        Jerome Brunet <jbrunet@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Michael Turquette <mturquette@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Rob Herring <robh+dt@...nel.org>, <linux-clk@...r.kernel.org>
CC:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Jianxin Pan <jianxin.pan@...ogic.com>,
        Victor Wan <victor.wan@...ogic.com>,
        XianWei Zhao <xianwei.zhao@...ogic.com>,
        Kelvin Zhang <kelvin.zhang@...ogic.com>,
        BiChao Zheng <bichao.zheng@...ogic.com>,
        YongHui Yu <yonghui.yu@...ogic.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-amlogic@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9 3/4] clk: meson: add DT documentation for emmc clock
 controller

Hi Stephen,

Thanks for your quick response.

On 2022/1/14 5:29, Stephen Boyd wrote:
> [ EXTERNAL EMAIL ]
> 
> Quoting Liang Yang (2022-01-13 03:57:44)
>> Document the MMC sub clock controller driver, the potential consumer
>> of this driver is MMC or NAND. Also add four clock bindings IDs which
>> provided by this driver.
>>
>> Signed-off-by: Liang Yang <liang.yang@...ogic.com>
>> ---
>>   .../bindings/clock/amlogic,mmc-clkc.yaml      | 64 +++++++++++++++++++
>>   include/dt-bindings/clock/amlogic,mmc-clkc.h  | 14 ++++
>>   2 files changed, 78 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/clock/amlogic,mmc-clkc.yaml
>>   create mode 100644 include/dt-bindings/clock/amlogic,mmc-clkc.h
>>
>> diff --git a/Documentation/devicetree/bindings/clock/amlogic,mmc-clkc.yaml b/Documentation/devicetree/bindings/clock/amlogic,mmc-clkc.yaml
>> new file mode 100644
>> index 000000000000..a274c3d5fc2e
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/clock/amlogic,mmc-clkc.yaml
>> @@ -0,0 +1,64 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/clock/amlogic,mmc-clkc.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Amlogic MMC Sub Clock Controller Driver Device Tree Bindings
>> +
>> +maintainers:
>> +  - jianxin.pan@...ogic.com
>> +  - liang.yang@...ogic.com
>> +
>> +properties:
>> +  compatible:
>> +    enum:
>> +      - "amlogic,axg-mmc-clkc", "syscon"
> 
> Why is it a syscon?

The register documented by reg is shared with SD/eMMC controller port C, 
and it need to be ops on NFC driver.

> 
> .