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https://github.com/torvalds/linux
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854f89a5b5
The .remove() callback for a platform driver returns an int which makes many driver authors wrongly assume it's possible to do error handling by returning an error code. However the value returned is ignored (apart from emitting a warning) and this typically results in resource leaks. To improve here there is a quest to make the remove callback return void. In the first step of this quest all drivers are converted to .remove_new(), which already returns void. Eventually after all drivers are converted, .remove_new() will be renamed to .remove(). Trivially convert this driver from always returning zero in the remove callback to the void returning variant. Link: https://lore.kernel.org/r/20231109202830.4124591-3-u.kleine-koenig@pengutronix.de Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
117 lines
3.1 KiB
C
117 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* omap-ocp2scp.c - transform ocp interface protocol to scp protocol
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*
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* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
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* Author: Kishon Vijay Abraham I <kishon@ti.com>
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*/
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/err.h>
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#include <linux/pm_runtime.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#define OCP2SCP_TIMING 0x18
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#define SYNC2_MASK 0xf
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static int ocp2scp_remove_devices(struct device *dev, void *c)
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{
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struct platform_device *pdev = to_platform_device(dev);
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platform_device_unregister(pdev);
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return 0;
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}
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static int omap_ocp2scp_probe(struct platform_device *pdev)
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{
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int ret;
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u32 reg;
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void __iomem *regs;
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struct resource *res;
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struct device_node *np = pdev->dev.of_node;
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if (np) {
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ret = of_platform_populate(np, NULL, NULL, &pdev->dev);
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if (ret) {
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dev_err(&pdev->dev,
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"failed to add resources for ocp2scp child\n");
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goto err0;
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}
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}
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pm_runtime_enable(&pdev->dev);
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/*
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* As per AM572x TRM: http://www.ti.com/lit/ug/spruhz6/spruhz6.pdf
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* under section 26.3.2.2, table 26-26 OCP2SCP TIMING Caution;
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* As per OMAP4430 TRM: http://www.ti.com/lit/ug/swpu231ap/swpu231ap.pdf
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* under section 23.12.6.2.2 , Table 23-1213 OCP2SCP TIMING Caution;
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* As per OMAP4460 TRM: http://www.ti.com/lit/ug/swpu235ab/swpu235ab.pdf
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* under section 23.12.6.2.2, Table 23-1213 OCP2SCP TIMING Caution;
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* As per OMAP543x TRM http://www.ti.com/lit/pdf/swpu249
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* under section 27.3.2.2, Table 27-27 OCP2SCP TIMING Caution;
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*
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* Read path of OCP2SCP is not working properly due to low reset value
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* of SYNC2 parameter in OCP2SCP. Suggested reset value is 0x6 or more.
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*/
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if (!of_device_is_compatible(np, "ti,am437x-ocp2scp")) {
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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regs = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(regs)) {
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ret = PTR_ERR(regs);
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goto err1;
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}
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pm_runtime_get_sync(&pdev->dev);
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reg = readl_relaxed(regs + OCP2SCP_TIMING);
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reg &= ~(SYNC2_MASK);
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reg |= 0x6;
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writel_relaxed(reg, regs + OCP2SCP_TIMING);
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pm_runtime_put_sync(&pdev->dev);
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}
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return 0;
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err1:
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pm_runtime_disable(&pdev->dev);
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err0:
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device_for_each_child(&pdev->dev, NULL, ocp2scp_remove_devices);
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return ret;
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}
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static void omap_ocp2scp_remove(struct platform_device *pdev)
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{
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pm_runtime_disable(&pdev->dev);
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device_for_each_child(&pdev->dev, NULL, ocp2scp_remove_devices);
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}
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#ifdef CONFIG_OF
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static const struct of_device_id omap_ocp2scp_id_table[] = {
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{ .compatible = "ti,omap-ocp2scp" },
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{ .compatible = "ti,am437x-ocp2scp" },
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{}
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};
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MODULE_DEVICE_TABLE(of, omap_ocp2scp_id_table);
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#endif
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static struct platform_driver omap_ocp2scp_driver = {
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.probe = omap_ocp2scp_probe,
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.remove_new = omap_ocp2scp_remove,
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.driver = {
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.name = "omap-ocp2scp",
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.of_match_table = of_match_ptr(omap_ocp2scp_id_table),
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},
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};
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module_platform_driver(omap_ocp2scp_driver);
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MODULE_ALIAS("platform:omap-ocp2scp");
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MODULE_AUTHOR("Texas Instruments Inc.");
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MODULE_DESCRIPTION("OMAP OCP2SCP driver");
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MODULE_LICENSE("GPL v2");
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