linux-kernel - Re: [PATCH 2/2] clk: qcom: Add ipq6018 apss clock controller

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Message-ID: <3131e896-8694-083e-7b0d-a72b4abe6bed@codeaurora.org>
Date:   Sun, 5 Apr 2020 13:56:16 +0530
From:   Sivaprakash Murugesan <sivaprak@...eaurora.org>
To:     Stephen Boyd <sboyd@...nel.org>, agross@...nel.org,
        bjorn.andersson@...aro.org, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, mturquette@...libre.com,
        robh+dt@...nel.org
Subject: Re: [PATCH 2/2] clk: qcom: Add ipq6018 apss clock controller

Hi Stephen,

Thanks for the review.

On 3/10/2020 1:54 AM, Stephen Boyd wrote:
> Quoting Sivaprakash Murugesan (2020-02-27 01:55:18)
>> diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig
>> index 15cdcdc..37e4ce2 100644
>> --- a/drivers/clk/qcom/Kconfig
>> +++ b/drivers/clk/qcom/Kconfig
>> @@ -89,6 +89,14 @@ config APQ_MMCC_8084
>>            Say Y if you want to support multimedia devices such as display,
>>            graphics, video encode/decode, camera, etc.
>>   
>> +config IPQ_APSS_6018
>> +       tristate "IPQ6018 APSS Clock Controller"
>> +       select IPQ_GCC_6018
>> +       help
>> +         Support for APSS clock controller on ipq6018 devices. The
>> +         APSS clock controller supports frequencies higher than 800Mhz.
> supports CPU frequencies? It's not clear what APSS is to a lot of people
> out there.
ok. Will try to elaborate.
>
>> +         Say Y if you want to support higher frequencies on ipq6018 devices.
> support CPU frequency scaling on ipq6018?
ok.
>
>> +
>>   config IPQ_GCC_4019
>>          tristate "IPQ4019 Global Clock Controller"
>>          help
>> diff --git a/drivers/clk/qcom/apss-ipq6018.c b/drivers/clk/qcom/apss-ipq6018.c
>> new file mode 100644
>> index 0000000..04b8962
>> --- /dev/null
>> +++ b/drivers/clk/qcom/apss-ipq6018.c
>> @@ -0,0 +1,210 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Copyright (c) 2018, The Linux Foundation. All rights reserved.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/err.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/of_device.h>
> Are these two includes needed at all?
No they're not. will remove it.
>> +#include <linux/clk-provider.h>
>> +#include <linux/regmap.h>
>> +
>> +#include <linux/reset-controller.h>
>> +#include <dt-bindings/clock/qcom,apss-ipq6018.h>
>> +
>> +#include "common.h"
>> +#include "clk-regmap.h"
>> +#include "clk-pll.h"
>> +#include "clk-rcg.h"
>> +#include "clk-branch.h"
>> +#include "clk-alpha-pll.h"
>> +#include "clk-regmap-divider.h"
>> +#include "clk-regmap-mux.h"
>> +#include "reset.h"
>> +
>> +#define F(f, s, h, m, n) { (f), (s), (2 * (h) - 1), (m), (n) }
> This can be removed. It's common in clk-rcg.h now
ok.
>
>> +
>> +static struct clk_branch apcs_alias0_core_clk = {
>> +       .halt_reg = 0x004c,
>> +       .clkr = {
>> +               .enable_reg = 0x004c,
>> +               .enable_mask = BIT(0),
>> +               .hw.init = &(struct clk_init_data){
>> +                       .name = "apcs_alias0_core_clk",
>> +                       .parent_hws = (const struct clk_hw *[]){
>> +                               &apcs_alias0_clk_src.clkr.hw },
>> +                       .num_parents = 1,
>> +                       .flags = CLK_SET_RATE_PARENT | CLK_IS_CRITICAL,
> Please add a comment about why CLK_IS_CRITICAL is here. Presumably in
> the case that a cpufreq driver doesn't probe and claim this clk?
ok.
>> +                       .ops = &clk_branch2_ops,
>> +               },
>> +       },
>> +};
>> +
>> +
> [...]
>> +
>> +static int __init apss_ipq6018_init(void)
>> +{
>> +       return platform_driver_register(&apss_ipq6018_driver);
>> +}
>> +core_initcall(apss_ipq6018_init);
>> +
>> +static void __exit apss_ipq6018_exit(void)
>> +{
>> +       platform_driver_unregister(&apss_ipq6018_driver);
>> +}
>> +module_exit(apss_ipq6018_exit);
> Any reason this can't just be module_platform_driver()?
yeah it can be. will fix it.