linux-kernel - Re: [PATCH 5/5] clk: qcom: gcc: Add clock driver for SM8350

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Date:   Thu, 3 Dec 2020 18:06:13 -0600
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Stephen Boyd <sboyd@...nel.org>,
        Vivek Aknurwar <viveka@...eaurora.org>,
        Andy Gross <agross@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Taniya Das <tdas@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jeevan Shriram <jshriram@...eaurora.org>
Subject: Re: [PATCH 5/5] clk: qcom: gcc: Add clock driver for SM8350

On Thu 03 Dec 01:02 CST 2020, Vinod Koul wrote:
> diff --git a/drivers/clk/qcom/gcc-sm8350.c b/drivers/clk/qcom/gcc-sm8350.c
[..]
> +static int gcc_sm8350_probe(struct platform_device *pdev)
> +{
> +	struct regmap *regmap;
> +	int ret;
> +
> +	regmap = qcom_cc_map(pdev, &gcc_sm8350_desc);
> +	if (IS_ERR(regmap)) {
> +		dev_err(&pdev->dev, "Failed to map gcc registers\n");
> +		return PTR_ERR(regmap);
> +	}
> +
> +	ret = qcom_cc_register_rcg_dfs(regmap, gcc_dfs_clocks, ARRAY_SIZE(gcc_dfs_clocks));
> +	if (ret)
> +		return ret;
> +
> +	/* FORCE_MEM_CORE_ON for ufs phy ice core clocks */
> +	regmap_update_bits(regmap, gcc_ufs_phy_ice_core_clk.halt_reg, BIT(14), BIT(14));
> +
> +	/*
> +	 * Enable clocks required by the i2c-connected pm8008 regulators. Don't
> +	 * register them with the clock framework so that client requests are
> +	 * short-circuited before grabbing the enable/prepare locks. This
> +	 * prevents deadlocks between the clk/regulator frameworks.
> +	 *
> +	 *	gcc_qupv3_wrap_1_m_ahb_clk
> +	 *	gcc_qupv3_wrap_1_s_ahb_clk
> +	 *	gcc_qupv3_wrap1_s5_clk
> +	 */

Isn't this a workaround inherited from the downstream control of
regulators from within the clock core? Does this still apply upstream?

Regards,
Bjorn

> +	regmap_update_bits(regmap, 0x52008, BIT(20), BIT(20));
> +	regmap_update_bits(regmap, 0x52008, BIT(21), BIT(21));
> +	regmap_update_bits(regmap, 0x52008, BIT(27), BIT(27));
> +
> +	return qcom_cc_really_probe(pdev, &gcc_sm8350_desc, regmap);
> +}
> +
> +static struct platform_driver gcc_sm8350_driver = {
> +	.probe = gcc_sm8350_probe,
> +	.driver = {
> +		.name = "sm8350-gcc",
> +		.of_match_table = gcc_sm8350_match_table,
> +	},
> +};
> +
> +static int __init gcc_sm8350_init(void)
> +{
> +	return platform_driver_register(&gcc_sm8350_driver);
> +}
> +subsys_initcall(gcc_sm8350_init);
> +
> +static void __exit gcc_sm8350_exit(void)
> +{
> +	platform_driver_unregister(&gcc_sm8350_driver);
> +}
> +module_exit(gcc_sm8350_exit);
> +
> +MODULE_DESCRIPTION("QTI GCC SM8350 Driver");
> +MODULE_LICENSE("GPL v2");
> -- 
> 2.26.2
>