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Thu, 5 Dec 2019 01:37:59 +0000 Received: from AM0PR04MB4481.eurprd04.prod.outlook.com ([fe80::f16d:a26a:840:f97c]) by AM0PR04MB4481.eurprd04.prod.outlook.com ([fe80::f16d:a26a:840:f97c%4]) with mapi id 15.20.2495.014; Thu, 5 Dec 2019 01:37:59 +0000 From: Peng Fan To: Leonard Crestez , "shawnguo@kernel.org" , Aisheng Dong Subject: RE: [PATCH] clk: imx: imx8qxp-lpcg: use devm_platform_ioremap_resource Thread-Topic: [PATCH] clk: imx: imx8qxp-lpcg: use devm_platform_ioremap_resource Thread-Index: AQHVqoum7IH7ZRFDgESKl5wnHnxd3aeqw/Ew Date: Thu, 5 Dec 2019 01:37:59 +0000 Message-ID: References: <1575454349-5762-1-git-send-email-peng.fan@nxp.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=peng.fan@nxp.com; x-originating-ip: [119.31.174.71] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 9d3936dd-d7d2-4caf-cd09-08d77923c2d5 x-ms-traffictypediagnostic: AM0PR04MB4723:|AM0PR04MB4723: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org > Subject: Re: [PATCH] clk: imx: imx8qxp-lpcg: use > devm_platform_ioremap_resource > > On 2019-12-04 12:14 PM, Peng Fan wrote: > > From: Peng Fan > > > > devm_platform_ioremap_resource() wraps platform_get_resource() and > > devm_ioremap_resource(), we could use this API to simplify the code. > > > > Signed-off-by: Peng Fan > > This patch has been posted before and it breaks uart on imx8qxp-mek and > possibly other things. > > The old and new paths are not equivalent: devm_platform_ioremap_resource > calls devm_ioremap_resource differs from devm_ioremap by also calling > devm_request_mem_region. > > This prevents other mappings in the area; this is not an issue for most drivers > but imx8qxp-lpcg maps whole subsystems. For example: > > adma_lpcg: clock-controller@59000000 { > compatible = "fsl,imx8qxp-lpcg-adma"; > reg = <0x59000000 0x2000000>; > #clock-cells = <1>; > }; > > adma_lpuart0: serial@5a060000 { > reg = <0x5a060000 0x1000>; > ... > }; > > Previously: https://patchwork.kernel.org/patch/10908807/ Thanks. I think at least need to provide some comments in code. Thanks, Peng. > > > --- > > drivers/clk/imx/clk-imx8qxp-lpcg.c | 8 ++------ > > 1 file changed, 2 insertions(+), 6 deletions(-) > > > > diff --git a/drivers/clk/imx/clk-imx8qxp-lpcg.c > > b/drivers/clk/imx/clk-imx8qxp-lpcg.c > > index c0aff7ca6374..3f2c2b068c73 100644 > > --- a/drivers/clk/imx/clk-imx8qxp-lpcg.c > > +++ b/drivers/clk/imx/clk-imx8qxp-lpcg.c > > @@ -164,7 +164,6 @@ 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; > > @@ -173,12 +172,9 @@ static int imx8qxp_lpcg_clk_probe(struct > platform_device *pdev) > > if (!ss_lpcg) > > return -ENODEV; > > > > - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > > - if (!res) > > - return -EINVAL; > > - base = devm_ioremap(dev, res->start, resource_size(res)); > > + base = devm_platform_ioremap_resource(pdev, 0); > > if (!base) > > - return -ENOMEM; > > + return PTR_ERR(base); > > > > clk_data = devm_kzalloc(&pdev->dev, struct_size(clk_data, hws, > > ss_lpcg->num_max), GFP_KERNEL); > > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel