Re: [PATCH v2 4/4] clk: qcom: lpass: Add support for LPASS clock controller for SC7180

[Taniya Das <tdas@codeaurora.org>]

Thanks for your review.

On 5/27/2020 8:40 AM, Stephen Boyd wrote:
> Quoting Taniya Das (2020-05-17 02:22:24)
>> diff --git a/drivers/clk/qcom/lpasscorecc-sc7180.c b/drivers/clk/qcom/lpasscorecc-sc7180.c
>> new file mode 100644
>> index 0000000..86e3599
>> --- /dev/null
>> +++ b/drivers/clk/qcom/lpasscorecc-sc7180.c
>> @@ -0,0 +1,479 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/*
>> + * Copyright (c) 2020, The Linux Foundation. All rights reserved.
>> + */
>> +
>> +#include <linux/clk-provider.h>
>> +#include <linux/err.h>
>> +#include <linux/module.h>
>> +#include <linux/of_device.h>
>> +#include <linux/pm_clock.h>
>> +#include <linux/pm_runtime.h>
>> +#include <linux/of.h>
>> +#include <linux/regmap.h>
>> +
>> +#include <dt-bindings/clock/qcom,lpasscorecc-sc7180.h>
>> +
>> +#include "clk-alpha-pll.h"
>> +#include "clk-branch.h"
>> +#include "clk-rcg.h"
>> +#include "clk-regmap.h"
>> +#include "common.h"
>> +#include "gdsc.h"
>> +
>> +enum {
>> +       P_BI_TCXO,
>> +       P_LPASS_LPAAUDIO_DIG_PLL_OUT_ODD,
>> +       P_SLEEP_CLK,
>> +};
>> +
>> +static struct pll_vco fabia_vco[] = {
>> +       { 249600000, 2000000000, 0 },
>> +};
>> +
>> +static const struct alpha_pll_config lpass_lpaaudio_dig_pll_config = {
>> +       .l = 0x20,
> [...]
>> +
>> +static struct regmap_config lpass_core_cc_sc7180_regmap_config = {
>> +       .reg_bits = 32,
>> +       .reg_stride = 4,
>> +       .val_bits = 32,
>> +       .fast_io = true,
>> +};
>> +
>> +static const struct qcom_cc_desc lpass_core_hm_sc7180_desc = {
>> +       .config = &lpass_core_cc_sc7180_regmap_config,
>> +       .gdscs = lpass_core_hm_sc7180_gdscs,
>> +       .num_gdscs = ARRAY_SIZE(lpass_core_hm_sc7180_gdscs),
>> +};
>> +
>> +static const struct qcom_cc_desc lpass_core_cc_sc7180_desc = {
>> +       .config = &lpass_core_cc_sc7180_regmap_config,
>> +       .clks = lpass_core_cc_sc7180_clocks,
>> +       .num_clks = ARRAY_SIZE(lpass_core_cc_sc7180_clocks),
>> +};
>> +
>> +static const struct qcom_cc_desc lpass_audio_hm_sc7180_desc = {
>> +       .config = &lpass_core_cc_sc7180_regmap_config,
>> +       .gdscs = lpass_audio_hm_sc7180_gdscs,
>> +       .num_gdscs = ARRAY_SIZE(lpass_audio_hm_sc7180_gdscs),
>> +};
>> +
>> +
> 
> Drop double newline please.
> 

Done.

>> +static int lpass_core_cc_sc7180_probe(struct platform_device *pdev)
>> +{
>> +       const struct qcom_cc_desc *desc;
>> +       struct regmap *regmap;
>> +       int ret;
>> +
>> +       lpass_core_cc_sc7180_regmap_config.name = "lpass_audio_cc";
>> +       desc = &lpass_audio_hm_sc7180_desc;
>> +       ret = qcom_cc_probe_by_index(pdev, 1, desc);
>> +       if (ret)
>> +               return ret;
>> +
>> +       lpass_core_cc_sc7180_regmap_config.name = "lpass_core_cc";
>> +       regmap = qcom_cc_map(pdev, &lpass_core_cc_sc7180_desc);
>> +       if (IS_ERR(regmap))
>> +               return PTR_ERR(regmap);
>> +
>> +       /*
>> +        * Keep the CLK always-ON
> 
> Why? Presumably to make sure we can access the lpass sysnoc path all the
> time?
> 

This is an always ON clock from HW, just making sure to keep it enabled.

>> +        * LPASS_AUDIO_CORE_SYSNOC_SWAY_CORE_CLK
>> +        */
>> +       regmap_update_bits(regmap, 0x24000, BIT(0), BIT(0));
>> +
>> +       /* PLL settings */
>> +       regmap_write(regmap, 0x1008, 0x20);
>> +       regmap_update_bits(regmap, 0x1014, BIT(0), BIT(0));
>> +
>> +       clk_fabia_pll_configure(&lpass_lpaaudio_dig_pll, regmap,
>> +                               &lpass_lpaaudio_dig_pll_config);
>> +
>> +       return qcom_cc_really_probe(pdev, &lpass_core_cc_sc7180_desc, regmap);
>> +}
>> +
>> +static int lpass_hm_core_probe(struct platform_device *pdev)
>> +{
>> +       const struct qcom_cc_desc *desc;
>> +       int ret;
>> +
>> +       lpass_core_cc_sc7180_regmap_config.name = "lpass_hm_core";
>> +       desc = &lpass_core_hm_sc7180_desc;
>> +
>> +       return qcom_cc_probe_by_index(pdev, 0, desc);
>> +}
>> +
>> +static const struct of_device_id lpass_core_cc_sc7180_match_table[] = {
>> +       {
>> +               .compatible = "qcom,sc7180-lpasshm",
>> +               .data = lpass_hm_core_probe,
>> +       },
>> +       {
>> +               .compatible = "qcom,sc7180-lpasscorecc",
>> +               .data = lpass_core_cc_sc7180_probe,
>> +       },
>> +       { }
>> +};
>> +MODULE_DEVICE_TABLE(of, lpass_core_cc_sc7180_match_table);
>> +
>> +static int lpass_core_sc7180_probe(struct platform_device *pdev)
>> +{
>> +       int (*clk_probe)(struct platform_device *p);
>> +       int ret;
>> +
>> +       pm_runtime_enable(&pdev->dev);
>> +       ret = pm_clk_create(&pdev->dev);
>> +       if (ret)
>> +               return ret;
>> +
>> +       ret = pm_clk_add(&pdev->dev, "gcc_lpass_sway");
>> +       if (ret < 0) {
>> +               dev_err(&pdev->dev, "failed to acquire iface clock\n");
> 
> Can the clk name be 'iface' if it's actually the interface clk?
> "gcc_lpass_sway" looks to be the actual clk name which we shouldn't care
> about here. It should be whatever clk name we consider it to be, which
> would mean iface probably.
>

Yes would use "iface".

>> +               goto disable_pm_runtime;
>> +       }
>> +
>> +       clk_probe = of_device_get_match_data(&pdev->dev);
>> +       if (!clk_probe)
>> +               return -EINVAL;
>> +
>> +       ret = clk_probe(pdev);
>> +       if (ret)
>> +               goto destroy_pm_clk;
>> +
>> +       return 0;

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