linux-kernel - Re: [PATCH v7 4/4] clk: qcom: add clock controller driver for qca8386/qca8084

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Date:   Thu, 14 Sep 2023 15:52:36 +0800
From:   Jie Luo <quic_luoj@...cinc.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        <andersson@...nel.org>, <agross@...nel.org>,
        <konrad.dybcio@...aro.org>, <mturquette@...libre.com>,
        <sboyd@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <catalin.marinas@....com>, <will@...nel.org>,
        <p.zabel@...gutronix.de>
CC:     <linux-arm-msm@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <quic_srichara@...cinc.com>
Subject: Re: [PATCH v7 4/4] clk: qcom: add clock controller driver for
 qca8386/qca8084



On 9/14/2023 2:15 PM, Krzysztof Kozlowski wrote:
> On 14/09/2023 07:46, Luo Jie wrote:
>> The clock controller driver of qca8386/qca8084 is registered
>> as the MDIO device, the hardware register is accessed by MDIO bus
>> that is normally used to access general PHY device, which is
>> different from the current existed qcom clock controller drivers
>> using ioremap to access hardware clock registers.
>>
>> MDIO bus is common utilized by both qca8386/qca8084 and other
>> PHY devices, so the mutex lock mdio_bus->mdio_lock should be
>> used instead of using the mutex lock of remap.
>>
>> To access the hardware clock registers of qca8386/qca8084, there
>> is special MDIO frame sequence(three MDIO read/write operations)
>> need to be sent to device.
>>
>> Signed-off-by: Luo Jie <quic_luoj@...cinc.com>
>> ---
>>   drivers/clk/qcom/Kconfig       |    9 +
>>   drivers/clk/qcom/Makefile      |    1 +
>>   drivers/clk/qcom/nsscc-qca8k.c | 2178 ++++++++++++++++++++++++++++++++
>>   3 files changed, 2188 insertions(+)
>>   create mode 100644 drivers/clk/qcom/nsscc-qca8k.c
>>
>> diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig
>> index 865db5202e4c..c95ada6a1385 100644
>> --- a/drivers/clk/qcom/Kconfig
>> +++ b/drivers/clk/qcom/Kconfig
>> @@ -203,6 +203,15 @@ config IPQ_GCC_9574
>>   	  i2c, USB, SD/eMMC, etc. Select this for the root clock
>>   	  of ipq9574.
>>   
>> +config IPQ_NSSCC_QCA8K
>> +	tristate "QCA8K(QCA8386 or QCA8084) NSS Clock Controller"
>> +	depends on MDIO_BUS || COMPILE_TEST
> 
> This is SoC is for both ARM and ARM64 worlds?
> 
Thanks Krzysztof for the comments.
This chip is independent of the ARCH, which just depends on the MDIO 
bus, both mips and arm are supported.

>> +	help
>> +	  Support for NSS(Network SubSystem) clock controller on
>> +	  qca8386/qca8084 chip.
>> +	  Say Y or M if you want to use network features of switch or
>> +	  PHY device. Select this for the root clock of qca8k.
>> +
> 
> 
> Best regards,
> Krzysztof
>