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https://github.com/AsahiLinux/u-boot
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
108 lines
2.8 KiB
C
108 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2011-2013
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* Texas Instruments, <www.ti.com>
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*/
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#include <common.h>
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#include <i2c.h>
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#include <power/tps65217.h>
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/**
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* tps65217_reg_read() - Generic function that can read a TPS65217 register
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* @src_reg: Source register address
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* @src_val: Address of destination variable
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* @return: 0 for success, not 0 on failure.
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*/
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int tps65217_reg_read(uchar src_reg, uchar *src_val)
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{
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return i2c_read(TPS65217_CHIP_PM, src_reg, 1, src_val, 1);
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}
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/**
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* tps65217_reg_write() - Generic function that can write a TPS65217 PMIC
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* register or bit field regardless of protection
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* level.
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*
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* @prot_level: Register password protection. Use
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* TPS65217_PROT_LEVEL_NONE,
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* TPS65217_PROT_LEVEL_1 or TPS65217_PROT_LEVEL_2
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* @dest_reg: Register address to write.
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* @dest_val: Value to write.
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* @mask: Bit mask (8 bits) to be applied. Function will only
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* change bits that are set in the bit mask.
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*
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* @return: 0 for success, not 0 on failure, as per the i2c API
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*/
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int tps65217_reg_write(uchar prot_level, uchar dest_reg, uchar dest_val,
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uchar mask)
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{
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uchar read_val;
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uchar xor_reg;
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int ret;
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/*
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* If we are affecting only a bit field, read dest_reg and apply the
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* mask
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*/
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if (mask != TPS65217_MASK_ALL_BITS) {
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ret = i2c_read(TPS65217_CHIP_PM, dest_reg, 1, &read_val, 1);
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if (ret)
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return ret;
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read_val &= (~mask);
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read_val |= (dest_val & mask);
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dest_val = read_val;
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}
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if (prot_level > 0) {
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xor_reg = dest_reg ^ TPS65217_PASSWORD_UNLOCK;
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ret = i2c_write(TPS65217_CHIP_PM, TPS65217_PASSWORD, 1,
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&xor_reg, 1);
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if (ret)
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return ret;
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}
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ret = i2c_write(TPS65217_CHIP_PM, dest_reg, 1, &dest_val, 1);
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if (ret)
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return ret;
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if (prot_level == TPS65217_PROT_LEVEL_2) {
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ret = i2c_write(TPS65217_CHIP_PM, TPS65217_PASSWORD, 1,
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&xor_reg, 1);
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if (ret)
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return ret;
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ret = i2c_write(TPS65217_CHIP_PM, dest_reg, 1, &dest_val, 1);
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if (ret)
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return ret;
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}
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return 0;
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}
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/**
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* tps65217_voltage_update() - Function to change a voltage level, as this
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* is a multi-step process.
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* @dc_cntrl_reg: DC voltage control register to change.
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* @volt_sel: New value for the voltage register
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* @return: 0 for success, not 0 on failure.
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*/
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int tps65217_voltage_update(uchar dc_cntrl_reg, uchar volt_sel)
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{
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if ((dc_cntrl_reg != TPS65217_DEFDCDC1) &&
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(dc_cntrl_reg != TPS65217_DEFDCDC2) &&
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(dc_cntrl_reg != TPS65217_DEFDCDC3))
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return 1;
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/* set voltage level */
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if (tps65217_reg_write(TPS65217_PROT_LEVEL_2, dc_cntrl_reg, volt_sel,
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TPS65217_MASK_ALL_BITS))
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return 1;
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/* set GO bit to initiate voltage transition */
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if (tps65217_reg_write(TPS65217_PROT_LEVEL_2, TPS65217_DEFSLEW,
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TPS65217_DCDC_GO, TPS65217_DCDC_GO))
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return 1;
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return 0;
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}
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