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f47a669ffa
In error case the error message doesn't provide much context: imx:clk-gpr-mux: failed to get parent (-EINVAL) So additionally provide the clock name in the message, in order to simplify the further analyze. Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com> Reviewed-by: Peng Fan <peng.fan@nxp.com> Signed-off-by: Abel Vesa <abel.vesa@linaro.org> Link: https://lore.kernel.org/r/20230308184603.10049-1-stefan.wahren@i2se.com
121 lines
2.6 KiB
C
121 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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*/
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#define pr_fmt(fmt) "imx:clk-gpr-mux: " fmt
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#include <linux/module.h>
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#include <linux/clk-provider.h>
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#include <linux/errno.h>
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#include <linux/export.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/regmap.h>
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#include <linux/mfd/syscon.h>
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#include "clk.h"
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struct imx_clk_gpr {
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struct clk_hw hw;
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struct regmap *regmap;
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u32 mask;
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u32 reg;
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const u32 *mux_table;
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};
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static struct imx_clk_gpr *to_imx_clk_gpr(struct clk_hw *hw)
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{
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return container_of(hw, struct imx_clk_gpr, hw);
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}
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static u8 imx_clk_gpr_mux_get_parent(struct clk_hw *hw)
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{
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struct imx_clk_gpr *priv = to_imx_clk_gpr(hw);
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unsigned int val;
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int ret;
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ret = regmap_read(priv->regmap, priv->reg, &val);
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if (ret)
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goto get_parent_err;
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val &= priv->mask;
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ret = clk_mux_val_to_index(hw, priv->mux_table, 0, val);
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if (ret < 0)
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goto get_parent_err;
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return ret;
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get_parent_err:
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pr_err("%s: failed to get parent (%pe)\n",
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clk_hw_get_name(hw), ERR_PTR(ret));
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/* return some realistic non negative value. Potentially we could
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* give index to some dummy error parent.
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*/
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return 0;
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}
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static int imx_clk_gpr_mux_set_parent(struct clk_hw *hw, u8 index)
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{
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struct imx_clk_gpr *priv = to_imx_clk_gpr(hw);
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unsigned int val = clk_mux_index_to_val(priv->mux_table, 0, index);
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return regmap_update_bits(priv->regmap, priv->reg, priv->mask, val);
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}
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static int imx_clk_gpr_mux_determine_rate(struct clk_hw *hw,
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struct clk_rate_request *req)
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{
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return clk_mux_determine_rate_flags(hw, req, 0);
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}
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static const struct clk_ops imx_clk_gpr_mux_ops = {
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.get_parent = imx_clk_gpr_mux_get_parent,
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.set_parent = imx_clk_gpr_mux_set_parent,
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.determine_rate = imx_clk_gpr_mux_determine_rate,
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};
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struct clk_hw *imx_clk_gpr_mux(const char *name, const char *compatible,
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u32 reg, const char **parent_names,
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u8 num_parents, const u32 *mux_table, u32 mask)
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{
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struct clk_init_data init = { };
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struct imx_clk_gpr *priv;
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struct regmap *regmap;
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struct clk_hw *hw;
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int ret;
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regmap = syscon_regmap_lookup_by_compatible(compatible);
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if (IS_ERR(regmap)) {
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pr_err("failed to find %s regmap\n", compatible);
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return ERR_CAST(regmap);
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}
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return ERR_PTR(-ENOMEM);
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init.name = name;
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init.ops = &imx_clk_gpr_mux_ops;
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init.parent_names = parent_names;
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init.num_parents = num_parents;
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init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE;
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priv->hw.init = &init;
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priv->regmap = regmap;
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priv->mux_table = mux_table;
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priv->reg = reg;
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priv->mask = mask;
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hw = &priv->hw;
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ret = clk_hw_register(NULL, &priv->hw);
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if (ret) {
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kfree(priv);
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hw = ERR_PTR(ret);
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}
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return hw;
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}
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