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Fri, 19 Apr 2019 10:42:51 +0000 From: Aisheng Dong To: "linux-clk@vger.kernel.org" Subject: [PATCH 1/1] Revert "clk: imx: use devm_platform_ioremap_resource() to simplify code" Thread-Topic: [PATCH 1/1] Revert "clk: imx: use devm_platform_ioremap_resource() to simplify code" Thread-Index: AQHU9pyjuGc/37hQDkmX93reiiRIug== Date: Fri, 19 Apr 2019 10:42:51 +0000 Message-ID: <1555670144-24220-1-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: HK0PR03CA0052.apcprd03.prod.outlook.com (2603:1096:203:52::16) To AM0PR04MB4211.eurprd04.prod.outlook.com (2603:10a6:208:5b::30) 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: ffbbd93c-a1f2-4a30-027b-08d6c4b3c56a x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0; 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Originally we use devm_ioremap() specifically because we want to bypass the devm_request_mem_region due to LPCG address space are shared with some other modules within the same SS (subsystem). The patch in question occasionally added the request_me_region back by calling devm_platform_ioremap_resource which results in all the devices with overlappded IO space failed to be probed as follows: [ 1.062996] fsl-lpuart 5a060000.serial: can't request region for resource [mem 0x5a060000-0x5a060fff] [ 1.071923] fsl-lpuart: probe of 5a060000.serial failed with error -16 Cc: Anson Huang Signed-off-by: Dong Aisheng Tested-by: Leonard Crestez --- Shawn, This is a new issue and only exist in imx/for-next branch. You can decide whether to remove it or take the revert patch. --- drivers/clk/imx/clk-imx8qxp-lpcg.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/clk/imx/clk-imx8qxp-lpcg.c b/drivers/clk/imx/clk-imx8qxp-lpcg.c index c711654..fb6edf1 100644 --- a/drivers/clk/imx/clk-imx8qxp-lpcg.c +++ b/drivers/clk/imx/clk-imx8qxp-lpcg.c @@ -159,6 +159,7 @@ static int imx8qxp_lpcg_clk_probe(struct platform_device *pdev) struct clk_hw_onecell_data *clk_data; const struct imx8qxp_ss_lpcg *ss_lpcg; const struct imx8qxp_lpcg_data *lpcg; + struct resource *res; struct clk_hw **clks; void __iomem *base; int i; @@ -167,7 +168,10 @@ static int imx8qxp_lpcg_clk_probe(struct platform_device *pdev) if (!ss_lpcg) return -ENODEV; - base = devm_platform_ioremap_resource(pdev, 0); + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -EINVAL; + base = devm_ioremap(dev, res->start, resource_size(res)); if (!base) return -ENOMEM;