linux-kernel - Re: [PATCH 02/18] clk: qcom: add the GCC driver for sa8775p

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Date:   Mon, 9 Jan 2023 19:18:29 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Bartosz Golaszewski <brgl@...ev.pl>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Georgi Djakov <djakov@...nel.org>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Richard Cochran <richardcochran@...il.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Vinod Koul <vkoul@...nel.org>, Alex Elder <elder@...nel.org>
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux.dev, linux-gpio@...r.kernel.org,
        netdev@...r.kernel.org, Shazad Hussain <quic_shazhuss@...cinc.com>,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH 02/18] clk: qcom: add the GCC driver for sa8775p



On 9.01.2023 18:58, Konrad Dybcio wrote:
> 
> 
> On 9.01.2023 18:44, Bartosz Golaszewski wrote:
>> From: Shazad Hussain <quic_shazhuss@...cinc.com>
>>
>> Add support for the Global Clock Controller found in the QTI SA8775P
>> platforms.
>>
>> Signed-off-by: Shazad Hussain <quic_shazhuss@...cinc.com>
>> [Bartosz: made the driver ready for upstream]
>> Co-developed-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
>> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
>> ---
> [...]
> 
>> +
>> +static struct gdsc usb20_prim_gdsc = {
>> +	.gdscr = 0x1C004,
> Please use lowercase hex literals outside #defines.
> 
>> +	.pd = {
>> +		.name = "usb20_prim_gdsc",
>> +	},
>> +	.pwrsts = PWRSTS_OFF_ON,
>> +};
>> +
> [...]
> 
>> +
>> +static const struct regmap_config gcc_sa8775p_regmap_config = {
>> +	.reg_bits = 32,
>> +	.reg_stride = 4,
>> +	.val_bits = 32,
>> +	.max_register = 0x472cffc,
> This is faaaaar more than what your DT node specifies.
> 
> With these two fixed, LGTM:
> 
> Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> 
> Konrad
>> +	.fast_io = true,
>> +};
>> +
>> +static const struct qcom_cc_desc gcc_sa8775p_desc = {
>> +	.config = &gcc_sa8775p_regmap_config,
>> +	.clks = gcc_sa8775p_clocks,
>> +	.num_clks = ARRAY_SIZE(gcc_sa8775p_clocks),
>> +	.resets = gcc_sa8775p_resets,
>> +	.num_resets = ARRAY_SIZE(gcc_sa8775p_resets),
>> +	.gdscs = gcc_sa8775p_gdscs,
>> +	.num_gdscs = ARRAY_SIZE(gcc_sa8775p_gdscs),
>> +};
>> +
>> +static const struct of_device_id gcc_sa8775p_match_table[] = {
>> +	{ .compatible = "qcom,gcc-sa8775p" },
One more thing, this should be qcom,sa8775p-gcc.

Konrad
>> +	{ }
>> +};
>> +MODULE_DEVICE_TABLE(of, gcc_sa8775p_match_table);
>> +
>> +static int gcc_sa8775p_probe(struct platform_device *pdev)
>> +{
>> +	struct regmap *regmap;
>> +	int ret;
>> +
>> +	regmap = qcom_cc_map(pdev, &gcc_sa8775p_desc);
>> +	if (IS_ERR(regmap))
>> +		return PTR_ERR(regmap);
>> +
>> +	ret = qcom_cc_register_rcg_dfs(regmap, gcc_dfs_clocks,
>> +				       ARRAY_SIZE(gcc_dfs_clocks));
>> +	if (ret)
>> +		return ret;
>> +
>> +	/*
>> +	 * Keep the clocks always-ON
>> +	 * GCC_CAMERA_AHB_CLK, GCC_CAMERA_XO_CLK, GCC_DISP1_AHB_CLK,
>> +	 * GCC_DISP1_XO_CLK, GCC_DISP_AHB_CLK, GCC_DISP_XO_CLK,
>> +	 * GCC_GPU_CFG_AHB_CLK, GCC_VIDEO_AHB_CLK, GCC_VIDEO_XO_CLK.
>> +	 */
>> +	regmap_update_bits(regmap, 0x32004, BIT(0), BIT(0));
>> +	regmap_update_bits(regmap, 0x32020, BIT(0), BIT(0));
>> +	regmap_update_bits(regmap, 0xc7004, BIT(0), BIT(0));
>> +	regmap_update_bits(regmap, 0xc7018, BIT(0), BIT(0));
>> +	regmap_update_bits(regmap, 0x33004, BIT(0), BIT(0));
>> +	regmap_update_bits(regmap, 0x33018, BIT(0), BIT(0));
>> +	regmap_update_bits(regmap, 0x7d004, BIT(0), BIT(0));
>> +	regmap_update_bits(regmap, 0x34004, BIT(0), BIT(0));
>> +	regmap_update_bits(regmap, 0x34024, BIT(0), BIT(0));
>> +
>> +	return qcom_cc_really_probe(pdev, &gcc_sa8775p_desc, regmap);
>> +}
>> +
>> +static struct platform_driver gcc_sa8775p_driver = {
>> +	.probe = gcc_sa8775p_probe,
>> +	.driver = {
>> +		.name = "gcc-sa8775p",
>> +		.of_match_table = gcc_sa8775p_match_table,
>> +	},
>> +};
>> +
>> +static int __init gcc_sa8775p_init(void)
>> +{
>> +	return platform_driver_register(&gcc_sa8775p_driver);
>> +}
>> +subsys_initcall(gcc_sa8775p_init);
>> +
>> +static void __exit gcc_sa8775p_exit(void)
>> +{
>> +	platform_driver_unregister(&gcc_sa8775p_driver);
>> +}
>> +module_exit(gcc_sa8775p_exit);
>> +
>> +MODULE_DESCRIPTION("Qualcomm SA8775P GCC driver");
>> +MODULE_LICENSE("GPL");