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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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01247ef7ec
This patch ensures probing of the ab8500-sysctrl driver during a DT enabled boot, so long as the associated nodes are present in the Device Tree binary. Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
88 lines
1.9 KiB
C
88 lines
1.9 KiB
C
/*
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* Copyright (C) ST-Ericsson SA 2010
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* Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com> for ST Ericsson.
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* License terms: GNU General Public License (GPL) version 2
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*/
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/abx500.h>
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#include <linux/mfd/abx500/ab8500.h>
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#include <linux/mfd/abx500/ab8500-sysctrl.h>
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static struct device *sysctrl_dev;
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static inline bool valid_bank(u8 bank)
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{
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return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
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(bank == AB8500_SYS_CTRL2_BLOCK));
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}
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int ab8500_sysctrl_read(u16 reg, u8 *value)
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{
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u8 bank;
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if (sysctrl_dev == NULL)
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return -EAGAIN;
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bank = (reg >> 8);
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if (!valid_bank(bank))
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return -EINVAL;
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return abx500_get_register_interruptible(sysctrl_dev, bank,
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(u8)(reg & 0xFF), value);
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}
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int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
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{
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u8 bank;
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if (sysctrl_dev == NULL)
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return -EAGAIN;
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bank = (reg >> 8);
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if (!valid_bank(bank))
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return -EINVAL;
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return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
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(u8)(reg & 0xFF), mask, value);
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}
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static int __devinit ab8500_sysctrl_probe(struct platform_device *pdev)
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{
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sysctrl_dev = &pdev->dev;
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return 0;
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}
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static int __devexit ab8500_sysctrl_remove(struct platform_device *pdev)
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{
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sysctrl_dev = NULL;
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return 0;
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}
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static const struct of_device_id ab8500_sysctrl_match[] = {
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{ .compatible = "stericsson,ab8500-sysctrl", },
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{}
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};
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static struct platform_driver ab8500_sysctrl_driver = {
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.driver = {
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.name = "ab8500-sysctrl",
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.owner = THIS_MODULE,
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.of_match_table = ab8500_sysctrl_match,
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},
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.probe = ab8500_sysctrl_probe,
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.remove = __devexit_p(ab8500_sysctrl_remove),
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};
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static int __init ab8500_sysctrl_init(void)
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{
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return platform_driver_register(&ab8500_sysctrl_driver);
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}
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subsys_initcall(ab8500_sysctrl_init);
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MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com");
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MODULE_DESCRIPTION("AB8500 system control driver");
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MODULE_LICENSE("GPL v2");
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