linux-kernel - Re: [PATCH v2 5/7] clk: qcom: Add support for GCC clock controller on SM8750

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Message-ID: <3d9d3d18-9028-4dbc-8e72-3ed70edc97f4@quicinc.com>
Date: Mon, 25 Nov 2024 13:31:58 -0800
From: Melody Olvera <quic_molvera@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC: Bjorn Andersson <andersson@...nel.org>,
        Michael Turquette
	<mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, Rob Herring
	<robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
	<conor+dt@...nel.org>,
        Taniya Das <quic_tdas@...cinc.com>,
        Trilok Soni
	<quic_tsoni@...cinc.com>,
        Satya Durga Srinivasu Prabhala
	<quic_satyap@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 5/7] clk: qcom: Add support for GCC clock controller on
 SM8750



On 11/18/2024 5:59 PM, Dmitry Baryshkov wrote:
> On Mon, Nov 18, 2024 at 11:30:58AM -0800, Melody Olvera wrote:
>>
>> On 11/15/2024 7:34 AM, Dmitry Baryshkov wrote:
>>> On Mon, Nov 11, 2024 at 04:28:05PM -0800, Melody Olvera wrote:
>>>> From: Taniya Das <quic_tdas@...cinc.com>
>>>>
>>>> Add support for GCC Clock Controller for SM8750 platform.
>>>>
>>>> Signed-off-by: Taniya Das <quic_tdas@...cinc.com>
>>>> Signed-off-by: Melody Olvera <quic_molvera@...cinc.com>
>>>> ---
>>>>    drivers/clk/qcom/Kconfig      |    9 +
>>>>    drivers/clk/qcom/Makefile     |    1 +
>>>>    drivers/clk/qcom/gcc-sm8750.c | 3274 +++++++++++++++++++++++++++++++++
>>>>    3 files changed, 3284 insertions(+)
>>>>    create mode 100644 drivers/clk/qcom/gcc-sm8750.c
>>>>
>>>> diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig
>>>> index ef89d686cbc4..26bfb607235b 100644
>>>> --- a/drivers/clk/qcom/Kconfig
>>>> +++ b/drivers/clk/qcom/Kconfig
>>>> @@ -1130,6 +1130,15 @@ config SM_GCC_8650
>>>>    	  Say Y if you want to use peripheral devices such as UART,
>>>>    	  SPI, I2C, USB, SD/UFS, PCIe etc.
>>>> +config SM_GCC_8750
>>>> +	tristate "SM8750 Global Clock Controller"
>>>> +	depends on ARM64 || COMPILE_TEST
>>>> +	select QCOM_GDSC
>>>> +	help
>>>> +	  Support for the global clock controller on SM8750 devices.
>>>> +	  Say Y if you want to use peripheral devices such as UART,
>>>> +	  SPI, I2C, USB, SD/UFS, PCIe etc.
>>>> +
>>>>    config SM_GPUCC_4450
>>>>    	tristate "SM4450 Graphics Clock Controller"
>>>>    	depends on ARM64 || COMPILE_TEST
>>>> diff --git a/drivers/clk/qcom/Makefile b/drivers/clk/qcom/Makefile
>>>> index b09dbdc210eb..1875018d1100 100644
>>>> --- a/drivers/clk/qcom/Makefile
>>>> +++ b/drivers/clk/qcom/Makefile
>>>> @@ -143,6 +143,7 @@ obj-$(CONFIG_SM_GCC_8350) += gcc-sm8350.o
>>>>    obj-$(CONFIG_SM_GCC_8450) += gcc-sm8450.o
>>>>    obj-$(CONFIG_SM_GCC_8550) += gcc-sm8550.o
>>>>    obj-$(CONFIG_SM_GCC_8650) += gcc-sm8650.o
>>>> +obj-$(CONFIG_SM_GCC_8750) += gcc-sm8750.o
>>>>    obj-$(CONFIG_SM_GPUCC_4450) += gpucc-sm4450.o
>>>>    obj-$(CONFIG_SM_GPUCC_6115) += gpucc-sm6115.o
>>>>    obj-$(CONFIG_SM_GPUCC_6125) += gpucc-sm6125.o
>>>> diff --git a/drivers/clk/qcom/gcc-sm8750.c b/drivers/clk/qcom/gcc-sm8750.c
>>>> new file mode 100644
>>>> index 000000000000..faaefa42a039
>>>> --- /dev/null
>>>> +++ b/drivers/clk/qcom/gcc-sm8750.c
>>>> @@ -0,0 +1,3274 @@
>>>> +// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>>> +/*
>>>> + * Copyright (c) 2024, Qualcomm Innovation Center, Inc. All rights reserved.
>>>> + */
>>>> +
>>>> +#include <linux/clk-provider.h>
>>>> +#include <linux/mod_devicetable.h>
>>>> +#include <linux/module.h>
>>>> +#include <linux/platform_device.h>
>>>> +#include <linux/regmap.h>
>>>> +
>>>> +#include <dt-bindings/clock/qcom,sm8750-gcc.h>
>>>> +
>>>> +#include "clk-alpha-pll.h"
>>>> +#include "clk-branch.h"
>>>> +#include "clk-pll.h"
>>>> +#include "clk-rcg.h"
>>>> +#include "clk-regmap.h"
>>>> +#include "clk-regmap-divider.h"
>>>> +#include "clk-regmap-mux.h"
>>>> +#include "clk-regmap-phy-mux.h"
>>>> +#include "common.h"
>>>> +#include "gdsc.h"
>>>> +#include "reset.h"
>>>> +
>>>> +enum {
>>>> +	DT_BI_TCXO,
>>>> +	DT_BI_TCXO_AO,
>>>> +	DT_PCIE_0_PIPE_CLK,
>>>> +	DT_SLEEP_CLK,
>>>> +	DT_UFS_PHY_RX_SYMBOL_0_CLK,
>>>> +	DT_UFS_PHY_RX_SYMBOL_1_CLK,
>>>> +	DT_UFS_PHY_TX_SYMBOL_0_CLK,
>>>> +	DT_USB3_PHY_WRAPPER_GCC_USB30_PIPE_CLK,
>>> This doesn't match Documentation/devicetree/bindings/clock/qcom,sm8650-gcc.yaml
>> Hmmm I see what seems to have happened here. You're correct; this doesn't
>> match the bindings
>> in sm8650-gcc. The v1 patchset had a new bindings file which matched the
>> sm8650 bindings, but also
>> didn't match the driver; however we only seemed to catch that the two
>> bindings matched and not the
>> fact that they didn't match the drivers.
> I don't see v1. Please bring bindings back.

Will do.

>
>> In terms of remedy I see two options. I'm fairly certain the driver here is
>> correct, so we can either
>> add the sm8750 bindings file back and remove the two lines about the PCIE 1
>> clocks or adjust the
>> sm8650 binding to encompass both sm8650 and sm8750. It's unclear to me how
>> precedented the latter
>> is; certainly having a single bindings file encompass both chips is
>> feasible, but I think I'm currently
>> leaning towards bringing back the original bindings file as that seems more
>> precedented. Lmk
>> your thoughts.
> How are you thinking to change SM8650 bindings without breaking the ABI
> / backwards compatibility?


Giant if-then (read: poorly).

Thanks,
Melody