mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-10-30 05:42:46 +01:00
Qiang Yu
22c70e5732
Before XO refclk is distributed to PCIe/USB/eDP PHYs, it passes through a QREF block. QREF is powered by dedicated LDO rails, and the clkref_en register controls whether refclk is gated through to the PHY side. These clkref controls are different from typical GCC branch clocks: - only a single enable bit is present, without branch-style config bits - regulators must be voted before enable and unvoted after disable Model this as a dedicated clk_ref clock type with custom clk_ops instead of reusing struct clk_branch semantics. Also provide a common registration/probe API so the same clkref model can be reused regardless of where clkref_en registers are placed, e.g. TCSR on glymur and TLMM on SM8750. Reviewed-by: Konrad Dybcio <[email protected]> Signed-off-by: Qiang Yu <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Bjorn Andersson <[email protected]>
68 lines
1.7 KiB
C
68 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Copyright (c) 2026, Qualcomm Technologies, Inc. and/or its subsidiaries.
|
|
*/
|
|
|
|
#ifndef __LINUX_CLK_QCOM_H
|
|
#define __LINUX_CLK_QCOM_H
|
|
|
|
#include <linux/clk-provider.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/kconfig.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/types.h>
|
|
|
|
struct device;
|
|
struct platform_device;
|
|
struct regulator_bulk_data;
|
|
|
|
/**
|
|
* struct qcom_clk_ref_desc - descriptor for a clkref_en gate clock
|
|
* @name: clock name exposed to the common clock framework
|
|
* @offset: clkref_en register offset from the block base
|
|
* @regulator_names: optional supply names enabled while preparing the clock
|
|
* @num_regulators: number of entries in @regulator_names
|
|
*/
|
|
struct qcom_clk_ref_desc {
|
|
const char *name;
|
|
u32 offset;
|
|
const char * const *regulator_names;
|
|
unsigned int num_regulators;
|
|
};
|
|
|
|
/**
|
|
* struct qcom_clk_ref - per-clock data for a clkref_en gate clock
|
|
* @hw: common clock framework hardware clock handle
|
|
* @regmap: register map backing the clkref_en register
|
|
* @desc: clock descriptor copied at registration time
|
|
* @regulators: optional bulk regulator handles for @desc.regulator_names
|
|
*/
|
|
struct qcom_clk_ref {
|
|
struct clk_hw hw;
|
|
struct regmap *regmap;
|
|
struct qcom_clk_ref_desc desc;
|
|
struct regulator_bulk_data *regulators;
|
|
};
|
|
|
|
#if IS_ENABLED(CONFIG_COMMON_CLK_QCOM)
|
|
|
|
int qcom_clk_ref_probe(struct platform_device *pdev,
|
|
const struct regmap_config *config,
|
|
const struct qcom_clk_ref_desc * const *descs,
|
|
size_t num_clk_refs);
|
|
|
|
#else
|
|
|
|
static inline int
|
|
qcom_clk_ref_probe(struct platform_device *pdev,
|
|
const struct regmap_config *config,
|
|
const struct qcom_clk_ref_desc * const *descs,
|
|
size_t num_clk_refs)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
#endif
|
|
|
|
#endif
|