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https://github.com/torvalds/linux
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dc0c386e09
The DT of_device.h and of_platform.h date back to the separate of_platform_bus_type before it as merged into the regular platform bus. As part of that merge prepping Arm DT support 13 years ago, they "temporarily" include each other. They also include platform_device.h and of.h. As a result, there's a pretty much random mix of those include files used throughout the tree. In order to detangle these headers and replace the implicit includes with struct declarations, users need to explicitly include the correct includes. Signed-off-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20230714174731.4059811-1-robh@kernel.org Signed-off-by: Lee Jones <lee@kernel.org>
104 lines
2.5 KiB
C
104 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* STM32 Low-Power Timer parent driver.
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* Copyright (C) STMicroelectronics 2017
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* Author: Fabrice Gasnier <fabrice.gasnier@st.com>
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* Inspired by Benjamin Gaignard's stm32-timers driver
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*/
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#include <linux/mfd/stm32-lptimer.h>
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#include <linux/module.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#define STM32_LPTIM_MAX_REGISTER 0x3fc
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static const struct regmap_config stm32_lptimer_regmap_cfg = {
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.reg_bits = 32,
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.val_bits = 32,
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.reg_stride = sizeof(u32),
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.max_register = STM32_LPTIM_MAX_REGISTER,
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.fast_io = true,
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};
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static int stm32_lptimer_detect_encoder(struct stm32_lptimer *ddata)
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{
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u32 val;
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int ret;
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/*
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* Quadrature encoder mode bit can only be written and read back when
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* Low-Power Timer supports it.
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*/
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ret = regmap_update_bits(ddata->regmap, STM32_LPTIM_CFGR,
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STM32_LPTIM_ENC, STM32_LPTIM_ENC);
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if (ret)
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return ret;
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ret = regmap_read(ddata->regmap, STM32_LPTIM_CFGR, &val);
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if (ret)
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return ret;
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ret = regmap_update_bits(ddata->regmap, STM32_LPTIM_CFGR,
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STM32_LPTIM_ENC, 0);
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if (ret)
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return ret;
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ddata->has_encoder = !!(val & STM32_LPTIM_ENC);
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return 0;
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}
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static int stm32_lptimer_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct stm32_lptimer *ddata;
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void __iomem *mmio;
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int ret;
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ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
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if (!ddata)
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return -ENOMEM;
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mmio = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
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if (IS_ERR(mmio))
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return PTR_ERR(mmio);
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ddata->regmap = devm_regmap_init_mmio_clk(dev, "mux", mmio,
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&stm32_lptimer_regmap_cfg);
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if (IS_ERR(ddata->regmap))
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return PTR_ERR(ddata->regmap);
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ddata->clk = devm_clk_get(dev, NULL);
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if (IS_ERR(ddata->clk))
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return PTR_ERR(ddata->clk);
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ret = stm32_lptimer_detect_encoder(ddata);
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if (ret)
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return ret;
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platform_set_drvdata(pdev, ddata);
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return devm_of_platform_populate(&pdev->dev);
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}
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static const struct of_device_id stm32_lptimer_of_match[] = {
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{ .compatible = "st,stm32-lptimer", },
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{},
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};
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MODULE_DEVICE_TABLE(of, stm32_lptimer_of_match);
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static struct platform_driver stm32_lptimer_driver = {
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.probe = stm32_lptimer_probe,
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.driver = {
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.name = "stm32-lptimer",
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.of_match_table = stm32_lptimer_of_match,
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},
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};
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module_platform_driver(stm32_lptimer_driver);
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MODULE_AUTHOR("Fabrice Gasnier <fabrice.gasnier@st.com>");
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MODULE_DESCRIPTION("STMicroelectronics STM32 Low-Power Timer");
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MODULE_ALIAS("platform:stm32-lptimer");
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MODULE_LICENSE("GPL v2");
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