linux-kernel - Re: [PATCH v10 6/6] clk: qcom: Add APCS clock controller support

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Date:   Tue, 5 Dec 2017 17:33:13 +0200
From:   Georgi Djakov <georgi.djakov@...aro.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     sboyd@...eaurora.org, jassisinghbrar@...il.com, robh@...nel.org,
        mturquette@...libre.com, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v10 6/6] clk: qcom: Add APCS clock controller support

On 12/05/2017 08:01 AM, Bjorn Andersson wrote:
> On Fri 01 Dec 09:02 PST 2017, Georgi Djakov wrote:
> [..]
>> diff --git a/drivers/clk/qcom/apcs-msm8916.c b/drivers/clk/qcom/apcs-msm8916.c
>> new file mode 100644
>> index 000000000000..f71039ff2347
>> --- /dev/null
>> +++ b/drivers/clk/qcom/apcs-msm8916.c
>> @@ -0,0 +1,149 @@
>> +/*
>> + * Qualcomm APCS clock controller driver
>> + *
>> + * Copyright (c) 2017, Linaro Limited
>> + * Author: Georgi Djakov <georgi.djakov@...aro.org>
>> + *
>> + * SPDX-License-Identifier: GPL-2.0
> 
> The SPDX-License-Identifier should be on the first line in the file,
> commented by //
> 
>> + */
>> +
> [..]
>> +static int qcom_apcs_msm8916_clk_probe(struct platform_device *pdev)
>> +{
>> +	struct device *dev = pdev->dev.parent;
> 
> Call this "parent" instead.
> 
>> +	struct device_node *np = dev->of_node;
>> +	struct clk_regmap_mux_div *a53cc;
>> +	struct regmap *regmap;
>> +	struct clk_init_data init = { };
>> +	int ret;
>> +
>> +	regmap = dev_get_regmap(dev, NULL);
>> +	if (IS_ERR(regmap)) {
>> +		ret = PTR_ERR(regmap);
>> +		dev_err(dev, "failed to get regmap: %d\n", ret);
> 
> dev_* prints should be on &pdev->dev and not on parent device.
> 
>> +		return ret;
>> +	}
>> +
>> +	a53cc = devm_kzalloc(dev, sizeof(*a53cc), GFP_KERNEL);
> 
> Perform this allocation on behalf of this device (i.e. &pdev->dev and
> not parent)
> 
>> +	if (!a53cc)
>> +		return -ENOMEM;
>> +
>> +	init.name = "a53mux";
>> +	init.parent_names = gpll0_a53cc;
>> +	init.num_parents = ARRAY_SIZE(gpll0_a53cc);
>> +	init.ops = &clk_regmap_mux_div_ops;
>> +	init.flags = CLK_SET_RATE_PARENT;
>> +
>> +	a53cc->clkr.hw.init = &init;
>> +	a53cc->clkr.regmap = regmap;
>> +	a53cc->reg_offset = 0x50;
>> +	a53cc->hid_width = 5;
>> +	a53cc->hid_shift = 0;
>> +	a53cc->src_width = 3;
>> +	a53cc->src_shift = 8;
>> +	a53cc->parent_map = gpll0_a53cc_map;
>> +
>> +	a53cc->pclk = devm_clk_get(dev, NULL);
>> +	if (IS_ERR(a53cc->pclk)) {
>> +		ret = PTR_ERR(a53cc->pclk);
>> +		dev_err(dev, "failed to get clk: %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	a53cc->clk_nb.notifier_call = a53cc_notifier_cb;
>> +	ret = clk_notifier_register(a53cc->pclk, &a53cc->clk_nb);
>> +	if (ret) {
>> +		dev_err(dev, "failed to register clock notifier: %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	ret = devm_clk_register_regmap(dev, &a53cc->clkr);
> 
> This you can do on the &pdev->dev, it won't find a regmap on this node
> and will try the parent.
> 
>> +	if (ret) {
>> +		dev_err(dev, "failed to register regmap clock: %d\n", ret);
>> +		goto err;
>> +	}
>> +
>> +	ret = of_clk_add_hw_provider(np, of_clk_hw_simple_get,
> 
> Be explicit here and do parent->of_node.
> 
>> +				     &a53cc->clkr.hw);
>> +	if (ret) {
>> +		dev_err(dev, "failed to add clock provider: %d\n", ret);
>> +		goto err;
>> +	}
>> +
>> +	platform_set_drvdata(pdev, a53cc);
>> +
>> +	return 0;
>> +
>> +err:
>> +	clk_notifier_unregister(a53cc->pclk, &a53cc->clk_nb);
>> +	return ret;
>> +}
>> +
>> +static int qcom_apcs_msm8916_clk_remove(struct platform_device *pdev)
>> +{
>> +	struct clk_regmap_mux_div *a53cc = platform_get_drvdata(pdev);
>> +
>> +	clk_notifier_unregister(a53cc->pclk, &a53cc->clk_nb);
>> +	of_clk_del_provider(pdev->dev.of_node);
> 
> You registered the provider on pdev->dev->parent.of_node.
> 
>> +
>> +	return 0;
>> +}
>> +

Hi Bjorn,

Thanks for reviewing! I agree with your comments and will send a new
version shortly.

BR,
Georgi