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https://github.com/brain-hackers/u-boot-brain
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04868b407b
Qualcom processors use proprietary bus to talk with PMIC devices - SPMI (System Power Management Interface). On wiring level it is similar to I2C, but on protocol level, it's multi-master and has simple autodetection capabilities. This commit adds simple uclass that provides bus read/write interface. Signed-off-by: Mateusz Kulikowski <mateusz.kulikowski@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org> Tested-by: Simon Glass <sjg@chromium.org>
49 lines
976 B
C
49 lines
976 B
C
/*
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* SPMI bus uclass driver
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*
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* (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <dm/root.h>
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#include <spmi/spmi.h>
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#include <linux/ctype.h>
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DECLARE_GLOBAL_DATA_PTR;
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int spmi_reg_read(struct udevice *dev, int usid, int pid, int reg)
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{
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const struct dm_spmi_ops *ops = dev_get_driver_ops(dev);
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if (!ops || !ops->read)
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return -ENOSYS;
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return ops->read(dev, usid, pid, reg);
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}
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int spmi_reg_write(struct udevice *dev, int usid, int pid, int reg,
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uint8_t value)
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{
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const struct dm_spmi_ops *ops = dev_get_driver_ops(dev);
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if (!ops || !ops->write)
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return -ENOSYS;
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return ops->write(dev, usid, pid, reg, value);
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}
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static int spmi_post_bind(struct udevice *dev)
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{
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return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
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}
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UCLASS_DRIVER(spmi) = {
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.id = UCLASS_SPMI,
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.name = "spmi",
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.post_bind = spmi_post_bind,
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};
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