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Message-ID: <CAA8EJpq75LhY3BD4JEqAOVAt1SxTvSOsdJTTb2bZD9rj15FmGA@mail.gmail.com>
Date: Wed, 17 Apr 2024 14:29:03 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Varadarajan Narayanan <quic_varada@...cinc.com>
Cc: andersson@...nel.org, mturquette@...libre.com, sboyd@...nel.org,
robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
konrad.dybcio@...aro.org, djakov@...nel.org, quic_anusha@...cinc.com,
linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-pm@...r.kernel.org
Subject: Re: [PATCH v8 5/7] clk: qcom: common: Add interconnect clocks support
On Wed, 17 Apr 2024 at 13:57, Varadarajan Narayanan
<quic_varada@...cinc.com> wrote:
>
> Unlike MSM platforms that manage NoC related clocks and scaling
> from RPM, IPQ SoCs dont involve RPM in managing NoC related
> clocks and there is no NoC scaling.
>
> However, there is a requirement to enable some NoC interface
> clocks for accessing the peripheral controllers present on
> these NoCs. Though exposing these as normal clocks would work,
> having a minimalistic interconnect driver to handle these clocks
> would make it consistent with other Qualcomm platforms resulting
> in common code paths. This is similar to msm8996-cbf's usage of
> icc-clk framework.
>
> Signed-off-by: Varadarajan Narayanan <quic_varada@...cinc.com>
> ---
> v8: Explicitly set master and slave ids
> v7: Restore clk_get
> v6: first_id -> icc_first_node_id
> Remove clock get so that the peripheral that uses the clock
> can do the clock get
> v5: Split changes in common.c to separate patch
> Fix error handling
> Use devm_icc_clk_register instead of icc_clk_register
> v4: Use clk_hw instead of indices
> Do icc register in qcom_cc_probe() call stream
> Add icc clock info to qcom_cc_desc structure
> v3: Use indexed identifiers here to avoid confusion
> Fix error messages and move to common.c
> v2: Move DTS to separate patch
> Update commit log
> Auto select CONFIG_INTERCONNECT & CONFIG_INTERCONNECT_CLK to fix build error
> ---
> drivers/clk/qcom/common.c | 35 ++++++++++++++++++++++++++++++++++-
> drivers/clk/qcom/common.h | 16 ++++++++++++++++
> 2 files changed, 50 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/clk/qcom/common.c b/drivers/clk/qcom/common.c
> index 75f09e6e057e..a6410b1828ca 100644
> --- a/drivers/clk/qcom/common.c
> +++ b/drivers/clk/qcom/common.c
> @@ -8,6 +8,7 @@
> #include <linux/regmap.h>
> #include <linux/platform_device.h>
> #include <linux/clk-provider.h>
> +#include <linux/interconnect-clk.h>
> #include <linux/reset-controller.h>
> #include <linux/of.h>
>
> @@ -234,6 +235,38 @@ static struct clk_hw *qcom_cc_clk_hw_get(struct of_phandle_args *clkspec,
> return cc->rclks[idx] ? &cc->rclks[idx]->hw : NULL;
> }
>
> +static int qcom_cc_icc_register(struct device *dev,
> + const struct qcom_cc_desc *desc)
> +{
> + struct icc_clk_data *icd;
> + struct clk_hw *hws;
> + int i;
> +
> + if (!IS_ENABLED(CONFIG_INTERCONNECT_CLK))
> + return 0;
> +
> + if (!desc->icc_hws)
> + return 0;
> +
> + icd = devm_kcalloc(dev, desc->num_icc_hws, sizeof(*icd), GFP_KERNEL);
> + if (!icd)
> + return -ENOMEM;
> +
> + for (i = 0; i < desc->num_icc_hws; i++) {
> + icd[i].master_id = desc->icc_hws[i].master_id;
> + icd[i].slave_id = desc->icc_hws[i].slave_id;
> + hws = &desc->clks[desc->icc_hws[i].clk_id]->hw;
I think I keep on repeating this again and again. Instead of passing
indices please pass clk_hw pointers.
> + icd[i].clk = devm_clk_hw_get_clk(dev, hws, "icc");
> + if (!icd[i].clk)
> + return dev_err_probe(dev, -ENOENT,
> + "(%d) clock entry is null\n", i);
> + icd[i].name = clk_hw_get_name(hws);
> + }
> +
> + return devm_icc_clk_register(dev, desc->icc_first_node_id,
> + desc->num_icc_hws, icd);
> +}
> +
> int qcom_cc_really_probe(struct platform_device *pdev,
> const struct qcom_cc_desc *desc, struct regmap *regmap)
> {
> @@ -303,7 +336,7 @@ int qcom_cc_really_probe(struct platform_device *pdev,
> if (ret)
> return ret;
>
> - return 0;
> + return qcom_cc_icc_register(dev, desc);
> }
> EXPORT_SYMBOL_GPL(qcom_cc_really_probe);
>
> diff --git a/drivers/clk/qcom/common.h b/drivers/clk/qcom/common.h
> index 9c8f7b798d9f..f6b25df1ca17 100644
> --- a/drivers/clk/qcom/common.h
> +++ b/drivers/clk/qcom/common.h
> @@ -19,6 +19,19 @@ struct clk_hw;
> #define PLL_VOTE_FSM_ENA BIT(20)
> #define PLL_VOTE_FSM_RESET BIT(21)
>
> +struct qcom_icc_hws_data {
> + int master_id;
> + int slave_id;
> + int clk_id;
> +};
> +
> +#define HWS_DATA(_b, _c) \
> +{ \
> + .master_id = MASTER_##_b, \
> + .slave_id = SLAVE_##_b, \
> + .clk_id = _c, \
> +}
This shouldn't be a part of this commit. It is not used in it.
> +
> struct qcom_cc_desc {
> const struct regmap_config *config;
> struct clk_regmap **clks;
> @@ -29,6 +42,9 @@ struct qcom_cc_desc {
> size_t num_gdscs;
> struct clk_hw **clk_hws;
> size_t num_clk_hws;
> + struct qcom_icc_hws_data *icc_hws;
> + size_t num_icc_hws;
> + unsigned int icc_first_node_id;
> };
>
> /**
> --
> 2.34.1
>
--
With best wishes
Dmitry
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