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Thu, 21 Feb 2019 18:03:54 +0000 From: Aisheng Dong To: "linux-clk@vger.kernel.org" Subject: [PATCH 4/4] clk: imx: imx8qxp-lpcg: add parsing clocks from device tree Thread-Topic: [PATCH 4/4] clk: imx: imx8qxp-lpcg: add parsing clocks from device tree Thread-Index: AQHUyg/OXauWfdVZQ0K2EXeEbwi2Cg== Date: Thu, 21 Feb 2019 18:03:54 +0000 Message-ID: <1550771836-10014-5-git-send-email-aisheng.dong@nxp.com> References: <1550771836-10014-1-git-send-email-aisheng.dong@nxp.com> In-Reply-To: <1550771836-10014-1-git-send-email-aisheng.dong@nxp.com> Accept-Language: zh-CN, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.7.4 x-clientproxiedby: HK2PR04CA0044.apcprd04.prod.outlook.com (2603:1096:202:14::12) To VI1PR04MB4222.eurprd04.prod.outlook.com (2603:10a6:803:3e::21) authentication-results: spf=none (sender IP is ) smtp.mailfrom=aisheng.dong@nxp.com; x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [119.31.174.66] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: a685bf21-8b64-4987-2763-08d69826f139 x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0; 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Cc: Stephen Boyd Cc: Shawn Guo Cc: Sascha Hauer Cc: Michael Turquette Signed-off-by: Dong Aisheng --- drivers/clk/imx/clk-imx8qxp-lpcg.c | 90 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 90 insertions(+) diff --git a/drivers/clk/imx/clk-imx8qxp-lpcg.c b/drivers/clk/imx/clk-imx8qxp-lpcg.c index 99c2508..dbbd3bd 100644 --- a/drivers/clk/imx/clk-imx8qxp-lpcg.c +++ b/drivers/clk/imx/clk-imx8qxp-lpcg.c @@ -9,6 +9,7 @@ #include #include #include +#include #include #include #include @@ -152,6 +153,88 @@ static const struct imx8qxp_ss_lpcg imx8qxp_ss_lsio = { .num_max = IMX_LSIO_LPCG_CLK_END, }; +#define IMX_LPCG_MAX_CLKS 8 + +static int imx_lpcg_parse_clks_from_dt(struct platform_device *pdev, + struct device_node *np) +{ + const char *output_names[IMX_LPCG_MAX_CLKS]; + const char *parent_names[IMX_LPCG_MAX_CLKS]; + unsigned int bit_offset[IMX_LPCG_MAX_CLKS]; + struct clk_hw_onecell_data *clk_data; + struct clk_hw **clk_hws; + struct resource *res; + void __iomem *base; + bool autogate; + int count; + int ret; + int i; + + if (!of_device_is_compatible(np, "fsl,imx8qxp-lpcg")) + return -EINVAL; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + count = of_property_count_u32_elems(np, "bit-offset"); + if (count < 0) { + dev_err(&pdev->dev, "failed to count clocks\n"); + return -EINVAL; + } + + clk_data = devm_kzalloc(&pdev->dev, struct_size(clk_data, hws, count), + GFP_KERNEL); + if (!clk_data) + return -ENOMEM; + + clk_data->num = count; + clk_hws = clk_data->hws; + + ret = of_property_read_u32_array(np, "bit-offset", bit_offset, + clk_data->num); + if (ret < 0) { + dev_err(&pdev->dev, "failed to read clocks bit-offset\n"); + return -EINVAL; + } + + ret = of_clk_parent_fill(np, parent_names, clk_data->num); + if (ret != clk_data->num) { + dev_err(&pdev->dev, "failed to get clock parent names\n"); + return -EINVAL; + } + + ret = of_property_read_string_array(np, "clock-output-names", + output_names, clk_data->num); + if (ret != clk_data->num) { + dev_err(&pdev->dev, "failed to read clock-output-names\n"); + return -EINVAL; + } + + autogate = of_property_read_bool(np, "hw-autogate"); + + for (i = 0; i < clk_data->num; i++) { + if (bit_offset[i] > 31) { + dev_warn(&pdev->dev, "invalid bit offset of clock %d\n", + i); + return -EINVAL; + } + + clk_hws[i] = imx_clk_lpcg_scu(output_names[i], + parent_names[i], 0, base, + bit_offset[i], autogate); + if (IS_ERR(clk_hws[i])) { + dev_warn(&pdev->dev, "failed to register clock %d\n", + i); + return -EINVAL; + } + } + + return devm_of_clk_add_hw_provider(&pdev->dev, of_clk_hw_onecell_get, + clk_data); +} + static int imx8qxp_lpcg_clk_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -162,8 +245,14 @@ static int imx8qxp_lpcg_clk_probe(struct platform_device *pdev) struct resource *res; struct clk_hw **clks; void __iomem *base; + int ret; int i; + /* try new binding to parse clocks from device tree first */ + ret = imx_lpcg_parse_clks_from_dt(pdev, np); + if (!ret) + return 0; + ss_lpcg = of_device_get_match_data(dev); if (!ss_lpcg) return -ENODEV; @@ -201,6 +290,7 @@ static const struct of_device_id imx8qxp_lpcg_match[] = { { .compatible = "fsl,imx8qxp-lpcg-adma", &imx8qxp_ss_adma, }, { .compatible = "fsl,imx8qxp-lpcg-conn", &imx8qxp_ss_conn, }, { .compatible = "fsl,imx8qxp-lpcg-lsio", &imx8qxp_ss_lsio, }, + { .compatible = "fsl,imx8qxp-lpcg", NULL }, { /* sentinel */ } };