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32960b4f25
Use scoped for_each_available_child_of_node_scoped() when iterating over device nodes to make code a bit simpler. Suggested-by: Jonathan Cameron <Jonathan.Cameron@Huawei.com> Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/r/20240825135001.48963-2-krzysztof.kozlowski@linaro.org Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
135 lines
3.1 KiB
C
135 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* ARM PL353 SMC driver
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*
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* Copyright (C) 2012 - 2018 Xilinx, Inc
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* Author: Punnaiah Choudary Kalluri <punnaiah@xilinx.com>
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* Author: Naga Sureshkumar Relli <nagasure@xilinx.com>
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*/
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#include <linux/clk.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/amba/bus.h>
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/**
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* struct pl353_smc_data - Private smc driver structure
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* @memclk: Pointer to the peripheral clock
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* @aclk: Pointer to the AXI peripheral clock
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*/
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struct pl353_smc_data {
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struct clk *memclk;
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struct clk *aclk;
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};
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static int __maybe_unused pl353_smc_suspend(struct device *dev)
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{
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struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev);
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clk_disable(pl353_smc->memclk);
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clk_disable(pl353_smc->aclk);
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return 0;
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}
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static int __maybe_unused pl353_smc_resume(struct device *dev)
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{
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struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev);
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int ret;
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ret = clk_enable(pl353_smc->aclk);
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if (ret) {
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dev_err(dev, "Cannot enable axi domain clock.\n");
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return ret;
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}
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ret = clk_enable(pl353_smc->memclk);
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if (ret) {
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dev_err(dev, "Cannot enable memory clock.\n");
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clk_disable(pl353_smc->aclk);
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return ret;
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}
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return ret;
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}
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static SIMPLE_DEV_PM_OPS(pl353_smc_dev_pm_ops, pl353_smc_suspend,
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pl353_smc_resume);
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static const struct of_device_id pl353_smc_supported_children[] = {
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{
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.compatible = "cfi-flash"
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},
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{
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.compatible = "arm,pl353-nand-r2p1",
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},
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{}
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};
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static int pl353_smc_probe(struct amba_device *adev, const struct amba_id *id)
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{
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struct device_node *of_node = adev->dev.of_node;
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const struct of_device_id *match = NULL;
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struct pl353_smc_data *pl353_smc;
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pl353_smc = devm_kzalloc(&adev->dev, sizeof(*pl353_smc), GFP_KERNEL);
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if (!pl353_smc)
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return -ENOMEM;
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pl353_smc->aclk = devm_clk_get_enabled(&adev->dev, "apb_pclk");
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if (IS_ERR(pl353_smc->aclk))
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return dev_err_probe(&adev->dev, PTR_ERR(pl353_smc->aclk),
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"aclk clock not found.\n");
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pl353_smc->memclk = devm_clk_get_enabled(&adev->dev, "memclk");
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if (IS_ERR(pl353_smc->memclk))
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return dev_err_probe(&adev->dev, PTR_ERR(pl353_smc->memclk),
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"memclk clock not found.\n");
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amba_set_drvdata(adev, pl353_smc);
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/* Find compatible children. Only a single child is supported */
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for_each_available_child_of_node_scoped(of_node, child) {
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match = of_match_node(pl353_smc_supported_children, child);
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if (!match) {
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dev_warn(&adev->dev, "unsupported child node\n");
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continue;
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}
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of_platform_device_create(child, NULL, &adev->dev);
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break;
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}
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if (!match) {
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dev_err(&adev->dev, "no matching children\n");
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return -ENODEV;
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}
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return 0;
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}
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static const struct amba_id pl353_ids[] = {
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{
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.id = 0x00041353,
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.mask = 0x000fffff,
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},
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{ 0, 0 },
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};
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MODULE_DEVICE_TABLE(amba, pl353_ids);
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static struct amba_driver pl353_smc_driver = {
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.drv = {
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.name = "pl353-smc",
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.pm = &pl353_smc_dev_pm_ops,
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},
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.id_table = pl353_ids,
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.probe = pl353_smc_probe,
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};
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module_amba_driver(pl353_smc_driver);
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MODULE_AUTHOR("Xilinx, Inc.");
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MODULE_DESCRIPTION("ARM PL353 SMC Driver");
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MODULE_LICENSE("GPL");
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