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 09:58:31 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Jie Luo <quic_luoj@...cinc.com>, 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 14/09/2023 09:52, Jie Luo wrote:
> 
> 
> 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.

There is no ARCH_QCOM on MIPS, so it's limited to ARM. Then add
restriction to ARM || COMPILE_TEST.

Best regards,
Krzysztof