https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 7111951b8d4973bda27ff663f2cf18b663d15b48 authored by Linus Torvalds on 29 March 2020, 22:25:41 UTC
Linux 5.6
Linux 5.6
Tip revision: 7111951
mux.c
// SPDX-License-Identifier: GPL-2.0
//
// Spreadtrum multiplexer clock driver
//
// Copyright (C) 2017 Spreadtrum, Inc.
// Author: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/regmap.h>
#include "mux.h"
u8 sprd_mux_helper_get_parent(const struct sprd_clk_common *common,
const struct sprd_mux_ssel *mux)
{
unsigned int reg;
u8 parent;
int num_parents;
int i;
regmap_read(common->regmap, common->reg, ®);
parent = reg >> mux->shift;
parent &= (1 << mux->width) - 1;
if (!mux->table)
return parent;
num_parents = clk_hw_get_num_parents(&common->hw);
for (i = 0; i < num_parents - 1; i++)
if (parent >= mux->table[i] && parent < mux->table[i + 1])
return i;
return num_parents - 1;
}
EXPORT_SYMBOL_GPL(sprd_mux_helper_get_parent);
static u8 sprd_mux_get_parent(struct clk_hw *hw)
{
struct sprd_mux *cm = hw_to_sprd_mux(hw);
return sprd_mux_helper_get_parent(&cm->common, &cm->mux);
}
int sprd_mux_helper_set_parent(const struct sprd_clk_common *common,
const struct sprd_mux_ssel *mux,
u8 index)
{
unsigned int reg;
if (mux->table)
index = mux->table[index];
regmap_read(common->regmap, common->reg, ®);
reg &= ~GENMASK(mux->width + mux->shift - 1, mux->shift);
regmap_write(common->regmap, common->reg,
reg | (index << mux->shift));
return 0;
}
EXPORT_SYMBOL_GPL(sprd_mux_helper_set_parent);
static int sprd_mux_set_parent(struct clk_hw *hw, u8 index)
{
struct sprd_mux *cm = hw_to_sprd_mux(hw);
return sprd_mux_helper_set_parent(&cm->common, &cm->mux, index);
}
const struct clk_ops sprd_mux_ops = {
.get_parent = sprd_mux_get_parent,
.set_parent = sprd_mux_set_parent,
.determine_rate = __clk_mux_determine_rate,
};
EXPORT_SYMBOL_GPL(sprd_mux_ops);