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Message-ID: <65b030c6-6fab-53ea-2774-48698905dd96@quicinc.com>
Date:   Thu, 5 Oct 2023 11:55:37 +0530
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Subject: Re: [PATCH V2 5/7] clk: qcom: Add NSS clock Controller driver for
 IPQ9574
From:   Devi Priya <quic_devipriy@quicinc.com>
To:     Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
CC:     <andersson@kernel.org>, <agross@kernel.org>,
        <konrad.dybcio@linaro.org>, <mturquette@baylibre.com>,
        <sboyd@kernel.org>, <robh+dt@kernel.org>,
        <krzysztof.kozlowski+dt@linaro.org>, <conor+dt@kernel.org>,
        <catalin.marinas@arm.com>, <will@kernel.org>,
        <p.zabel@pengutronix.de>, <richardcochran@gmail.com>,
        <arnd@arndb.de>, <geert+renesas@glider.be>,
        <nfraprado@collabora.com>, <rafal@milecki.pl>, <peng.fan@nxp.com>,
        <linux-arm-msm@vger.kernel.org>, <linux-clk@vger.kernel.org>,
        <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>, <netdev@vger.kernel.org>,
        <quic_saahtoma@quicinc.com>
References: <20230825091234.32713-1-quic_devipriy@quicinc.com>
 <20230825091234.32713-6-quic_devipriy@quicinc.com>
 <CAA8EJpr+Wwgot-PDRtj-LVi79aD13B9WVREmjTXiR-8XEEx-rQ@mail.gmail.com>
 <652b55cc-87dd-46d1-e480-e25f5f22b8d8@quicinc.com>
 <a4c9baae-f328-22b5-48d7-fc7df0b62a79@quicinc.com>
 <CAA8EJpq0uawrOBHA8XHygEpGYF--HyxJWxKG44iiFdAZZz7O2w@mail.gmail.com>
 <45f96567-553c-9214-eb7e-c75c6e09d78b@quicinc.com>
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On 9/22/2023 5:31 PM, Devi Priya wrote:
> 
> 
> On 9/20/2023 1:50 PM, Dmitry Baryshkov wrote:
>> On Wed, 20 Sept 2023 at 09:39, Devi Priya <quic_devipriy@quicinc.com> 
>> wrote:
>>>
>>>
>>>
>>> On 9/12/2023 7:38 PM, Devi Priya wrote:
>>>>
>>>>
>>>> On 8/25/2023 5:14 PM, Dmitry Baryshkov wrote:
>>>>> On Fri, 25 Aug 2023 at 12:15, Devi Priya <quic_devipriy@quicinc.com>
>>>>> wrote:
>>>>>>
>>>>>> Add Networking Sub System Clock Controller(NSSCC) driver for ipq9574
>>>>>> based
>>>>>> devices.
>>>>>>
>>>>>> Signed-off-by: Devi Priya <quic_devipriy@quicinc.com>
>>>>>> ---
>>>>>>    Changes in V2:
>>>>>>           - Added depends on ARM64 || COMPILE_TEST in Kconfig
>>>>>>           - Added module_platform_driver
>>>>>>           - Dropped patch [2/6] - clk: qcom: gcc-ipq9574: Mark nssnoc
>>>>>> clocks as critical
>>>>>>              & added pm_clk for nssnoc clocks
>>>>>>           - Updated the uniphy clock names
>>>>>>
>>>>>>    drivers/clk/qcom/Kconfig         |    7 +
>>>>>>    drivers/clk/qcom/Makefile        |    1 +
>>>>>>    drivers/clk/qcom/nsscc-ipq9574.c | 3109 
>>>>>> ++++++++++++++++++++++++++++++
>>>>>>    3 files changed, 3117 insertions(+)
>>>>>>    create mode 100644 drivers/clk/qcom/nsscc-ipq9574.c
>>>>>>
>>>>>> diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig
>>>>>> index bd9bfb11b328..3ecc11e2c8e3 100644
>>>>>> --- a/drivers/clk/qcom/Kconfig
>>>>>> +++ b/drivers/clk/qcom/Kconfig
>>>>>> @@ -203,6 +203,13 @@ config IPQ_GCC_9574
>>>>>>             i2c, USB, SD/eMMC, etc. Select this for the root clock
>>>>>>             of ipq9574.
>>>>>>
>>>>>> +config IPQ_NSSCC_9574
>>>>>> +       tristate "IPQ9574 NSS Clock Controller"
>>>>>> +       depends on ARM64 || COMPILE_TEST
>>>>>> +       depends on IPQ_GCC_9574
>>>>>> +       help
>>>>>> +         Support for NSS clock controller on ipq9574 devices.
>>>>>> +
>>>>>>    config MSM_GCC_8660
>>>>>>           tristate "MSM8660 Global Clock Controller"
>>>>>>           depends on ARM || COMPILE_TEST
>>>>>> diff --git a/drivers/clk/qcom/Makefile b/drivers/clk/qcom/Makefile
>>>>>> index 4790c8cca426..3f084928962e 100644
>>>>>> --- a/drivers/clk/qcom/Makefile
>>>>>> +++ b/drivers/clk/qcom/Makefile
>>>>>> @@ -30,6 +30,7 @@ obj-$(CONFIG_IPQ_GCC_6018) += gcc-ipq6018.o
>>>>>>    obj-$(CONFIG_IPQ_GCC_806X) += gcc-ipq806x.o
>>>>>>    obj-$(CONFIG_IPQ_GCC_8074) += gcc-ipq8074.o
>>>>>>    obj-$(CONFIG_IPQ_GCC_9574) += gcc-ipq9574.o
>>>>>> +obj-$(CONFIG_IPQ_NSSCC_9574)   += nsscc-ipq9574.o
>>>>>>    obj-$(CONFIG_IPQ_LCC_806X) += lcc-ipq806x.o
>>>>>>    obj-$(CONFIG_MDM_GCC_9607) += gcc-mdm9607.o
>>>>>>    obj-$(CONFIG_MDM_GCC_9615) += gcc-mdm9615.o
>>>>>> diff --git a/drivers/clk/qcom/nsscc-ipq9574.c
>>>>>> b/drivers/clk/qcom/nsscc-ipq9574.c
>>>>>> new file mode 100644
>>>>>> index 000000000000..65bdb449ae5f
>>>>>> --- /dev/null
>>>>>> +++ b/drivers/clk/qcom/nsscc-ipq9574.c
>>>>>> @@ -0,0 +1,3109 @@
>>>>>> +// SPDX-License-Identifier: GPL-2.0-only
>>>>>> +/*
>>>>>> + * Copyright (c) 2021, The Linux Foundation. All rights reserved.
>>>>>> + * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights
>>>>>> reserved.
>>>>>> + */
>>>>>> +
>>>>>> +#include <linux/clk-provider.h>
>>>>>> +#include <linux/err.h>
>>>>>> +#include <linux/kernel.h>
>>>>>> +#include <linux/module.h>
>>>>>> +#include <linux/of.h>
>>>>>> +#include <linux/of_device.h>
>>>>>> +#include <linux/regmap.h>
>>>>>> +#include <linux/pm_clock.h>
>>>>>> +#include <linux/pm_runtime.h>
>>>>>> +
>>>>>> +#include <dt-bindings/clock/qcom,ipq9574-nsscc.h>
>>>>>> +#include <dt-bindings/reset/qcom,ipq9574-nsscc.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 "common.h"
>>>>>> +#include "reset.h"
>>>>>> +
>>>>>> +/* Need to match the order of clocks in DT binding */
>>>>>> +enum {
>>>>>> +       DT_NSSNOC_NSSCC_CLK,
>>>>>> +       DT_NSSNOC_SNOC_CLK,
>>>>>> +       DT_NSSNOC_SNOC_1_CLK,
>>>>>
>>>>> Not using the index makes it seem that these clocks are not used,
>>>>> until one scrolls down to pm_clks.
>>>> Okay, got it
>>>>>
>>>>> BTW: The NSSNOC_SNOC clocks make it look like there is an interconnect
>>>>> here (not a simple NIU).
>>>>
>>>> Hi Dmitry, We are exploring on the ICC driver. In the meantime to
>>>> unblock PCIe/NSS changes getting merged, shall we use 
>>>> regmap_update_bits
>>>> and turn on the critical NSSNOC clocks, ANOC & SNOC pcie clocks in the
>>>> probe function of the gcc driver itself as like sm8550 driver to get 
>>>> the
>>>> changes merged?
>>>>
>>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/clk/qcom/gcc-sm8550.c#n3347
>>>
>>> Hi Dmitry,
>>> Just curious to know if we could send out the next series with the
>>> proposed approach if that holds good.
>>
>> The answer really depends on the structure of your hardware. The issue
>> is that once you commit the device bindings,you have to support them
>> forever. So, if you commit the NSS clock support without interconnects
>> in place, you have to keep this ANOC/SNOC/etc code forever, even after
>> you land the interconnect. So I'd suggest landing the icc driver first
>> (or at least implementing and sending to the mailing list), so that we
>> can see how all these pieces fit together.
> 
> Hi Dmitry,
> Unlike MSM chipsets, IPQ chipsets does not have any use case wherein the
> NOC clocks have to be scaled. So if these clocks can be enabled in the
> probe, there is no need for an interconnect driver at all. The same
> applies to both ipq9574 and ipq5332 SoCs.
> 

Hi Dmitry,
Just curious to know if we can go ahead with the proposed solution of
enabling the NOC clocks in the probe as these clocks need not be scaled
in IPQ chipsets & hence there would be no need for an ICC driver in
ipq9574 & ipq5332 targets.

Thanks,
Devi Priya

> Thanks,
> Devi Priya
>>
>>> Thanks,
>>> Devi Priya
>>>
>>>>>
>>>>>> +       DT_BIAS_PLL_CC_CLK,
>>>>>> +       DT_BIAS_PLL_NSS_NOC_CLK,
>>>>>> +       DT_BIAS_PLL_UBI_NC_CLK,
>>>>>> +       DT_GCC_GPLL0_OUT_AUX,
>>>>>> +       DT_UNIPHY0_NSS_RX_CLK,
>>>>>> +       DT_UNIPHY0_NSS_TX_CLK,
>>>>>> +       DT_UNIPHY1_NSS_RX_CLK,
>>>>>> +       DT_UNIPHY1_NSS_TX_CLK,
>>>>>> +       DT_UNIPHY2_NSS_RX_CLK,
>>>>>> +       DT_UNIPHY2_NSS_TX_CLK,
>>>>>> +       DT_XO,
>>>>>
>>>>> As I wrote, please move DT_XO closer to the beginning of the list.
>>>>>
>>>>>> +};
>>>>>> +
>>>>>> +enum {
>>>>>> +       P_BIAS_PLL_CC_CLK,
>>>>>> +       P_BIAS_PLL_NSS_NOC_CLK,
>>>>>> +       P_BIAS_PLL_UBI_NC_CLK,
>>>>>> +       P_GCC_GPLL0_OUT_AUX,
>>>>>> +       P_UBI32_PLL_OUT_MAIN,
>>>>>> +       P_UNIPHY0_NSS_RX_CLK,
>>>>>> +       P_UNIPHY0_NSS_TX_CLK,
>>>>>> +       P_UNIPHY1_NSS_RX_CLK,
>>>>>> +       P_UNIPHY1_NSS_TX_CLK,
>>>>>> +       P_UNIPHY2_NSS_RX_CLK,
>>>>>> +       P_UNIPHY2_NSS_TX_CLK,
>>>>>> +       P_XO,
>>>>>> +};
>>>>>> +
>>>>>> +static const struct alpha_pll_config ubi32_pll_config = {
>>>>>> +       .l = 0x3e,
>>>>>> +       .alpha = 0x6666,
>>>>>> +       .config_ctl_val = 0x200d4aa8,
>>>>>> +       .config_ctl_hi_val = 0x3c,
>>>>>> +       .main_output_mask = BIT(0),
>>>>>> +       .aux_output_mask = BIT(1),
>>>>>> +       .pre_div_val = 0x0,
>>>>>> +       .pre_div_mask = BIT(12),
>>>>>> +       .post_div_val = 0x0,
>>>>>> +       .post_div_mask = GENMASK(9, 8),
>>>>>> +       .alpha_en_mask = BIT(24),
>>>>>> +       .test_ctl_val = 0x1c0000c0,
>>>>>> +       .test_ctl_hi_val = 0x4000,
>>>>>> +};
>>>>>> +
>>>>>> +static struct clk_alpha_pll ubi32_pll_main = {
>>>>>> +       .offset = 0x28000,
>>>>>> +       .regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_NSS_HUAYRA],
>>>>>> +       .flags = SUPPORTS_DYNAMIC_UPDATE,
>>>>>> +       .clkr = {
>>>>>> +               .hw.init = &(const struct clk_init_data) {
>>>>>> +                       .name = "ubi32_pll_main",
>>>>>> +                       .parent_data = &(const struct 
>>>>>> clk_parent_data) {
>>>>>> +                               .index = DT_XO,
>>>>>> +                       },
>>>>>> +                       .num_parents = 1,
>>>>>> +                       .ops = &clk_alpha_pll_huayra_ops,
>>>>>> +               },
>>>>>> +       },
>>>>>> +};
>>>>>> +
>>>>>> +static struct clk_alpha_pll_postdiv ubi32_pll = {
>>>>>> +       .offset = 0x28000,
>>>>>> +       .regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_NSS_HUAYRA],
>>>>>> +       .width = 2,
>>>>>> +       .clkr.hw.init = &(const struct clk_init_data) {
>>>>>> +               .name = "ubi32_pll",
>>>>>> +               .parent_hws = (const struct clk_hw *[]) {
>>>>>> +                       &ubi32_pll_main.clkr.hw
>>>>>> +               },
>>>>>> +               .num_parents = 1,
>>>>>> +               .ops = &clk_alpha_pll_postdiv_ro_ops,
>>>>>> +               .flags = CLK_SET_RATE_PARENT,
>>>>>> +       },
>>>>>> +};
>>>>>> +
>>>>>
>>>>> [skipped clock tables, LGTM]
>>>>>
>>>>>> +static const struct of_device_id nss_cc_ipq9574_match_table[] = {
>>>>>> +       { .compatible = "qcom,ipq9574-nsscc" },
>>>>>> +       { }
>>>>>> +};
>>>>>> +MODULE_DEVICE_TABLE(of, nss_cc_ipq9574_match_table);
>>>>>> +
>>>>>> +static int nss_cc_ipq9574_probe(struct platform_device *pdev)
>>>>>> +{
>>>>>> +       struct regmap *regmap;
>>>>>> +       struct qcom_cc_desc nsscc_ipq9574_desc = nss_cc_ipq9574_desc;
>>>>>> +
>>>>>> +       int ret;
>>>>>> +
>>>>>> +       ret = devm_pm_runtime_enable(&pdev->dev);
>>>>>> +       if (ret < 0)
>>>>>> +               return ret;
>>>>>> +
>>>>>> +       ret = devm_pm_clk_create(&pdev->dev);
>>>>>> +       if (ret < 0)
>>>>>> +               return ret;
>>>>>> +
>>>>>> +       ret = of_pm_clk_add_clk(&pdev->dev, "nssnoc_nsscc");
>>>>>
>>>>> As we are switching to DT indices, better add new API that takes index
>>>>> rather than mixing indices and names.
>>>> sure okay
>>>>
>>>> Thanks,
>>>> Devi Priya
>>>>>
>>>>>> +       if (ret < 0) {
>>>>>> +               dev_err(&pdev->dev, "Failed to acquire nssnoc_nsscc
>>>>>> clock\n");
>>>>>> +               return ret;
>>>>>> +       }
>>>>>> +
>>>>>> +       ret = of_pm_clk_add_clk(&pdev->dev, "nssnoc_snoc");
>>>>>> +       if (ret < 0) {
>>>>>> +               dev_err(&pdev->dev, "Failed to acquire nssnoc_snoc
>>>>>> clock\n");
>>>>>> +               return ret;
>>>>>> +       }
>>>>>> +
>>>>>> +       ret = of_pm_clk_add_clk(&pdev->dev, "nssnoc_snoc_1");
>>>>>> +       if (ret < 0) {
>>>>>> +               dev_err(&pdev->dev, "Failed to acquire nssnoc_snoc_1
>>>>>> clock\n");
>>>>>> +               return ret;
>>>>>> +       }
>>>>>> +
>>>>>> +       ret = pm_runtime_get(&pdev->dev);
>>>>>> +       if (ret)
>>>>>> +               return ret;
>>>>>> +
>>>>>> +       regmap = qcom_cc_map(pdev, &nsscc_ipq9574_desc);
>>>>>> +       if (IS_ERR(regmap))
>>>>>> +               return PTR_ERR(regmap);
>>>>>> +
>>>>>> +       clk_alpha_pll_configure(&ubi32_pll_main, regmap,
>>>>>> &ubi32_pll_config);
>>>>>> +
>>>>>> +       return qcom_cc_really_probe(pdev, &nsscc_ipq9574_desc, 
>>>>>> regmap);
>>>>>> +}
>>>>>> +
>>>>>> +static const struct dev_pm_ops nss_cc_pm_ops = {
>>>>>> +       SET_RUNTIME_PM_OPS(pm_clk_suspend, pm_clk_resume, NULL)
>>>>>> +};
>>>>>> +
>>>>>> +static struct platform_driver nss_cc_ipq9574_driver = {
>>>>>> +       .probe = nss_cc_ipq9574_probe,
>>>>>> +       .driver = {
>>>>>> +               .name = "qcom,nsscc-ipq9574",
>>>>>> +               .of_match_table = nss_cc_ipq9574_match_table,
>>>>>> +               .pm = &nss_cc_pm_ops,
>>>>>> +       },
>>>>>> +};
>>>>>> +
>>>>>> +module_platform_driver(nss_cc_ipq9574_driver);
>>>>>> +
>>>>>> +MODULE_DESCRIPTION("QTI NSS_CC IPQ9574 Driver");
>>>>>> +MODULE_LICENSE("GPL");
>>>>>> -- 
>>>>>> 2.34.1
>>>>>>
>>>>>
>>>>>
>>
>>
>>