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Date: Wed, 14 Aug 2019 15:46:55 +0200
From: Neil Armstrong <narmstrong@...libre.com>
To: Jerome Brunet <jbrunet@...libre.com>
Cc: Kevin Hilman <khilman@...libre.com>,
linux-amlogic@...ts.infradead.org, linux-clk@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] clk: meson: axg-audio: add g12a reset support
On 12/08/2019 14:32, Jerome Brunet wrote:
> On the g12a, the register space dedicated to the audio clock also
> provides some resets. Let the clock controller register a reset
> provider as well for this SoC family.
>
> the axg SoC family does not appear to provide this feature.
>
> Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
> ---
> drivers/clk/meson/axg-audio.c | 107 +++++++++++++++++++++++++++++++++-
> drivers/clk/meson/axg-audio.h | 1 +
> 2 files changed, 106 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/clk/meson/axg-audio.c b/drivers/clk/meson/axg-audio.c
> index 741df7e955ca..6be9df1efce5 100644
> --- a/drivers/clk/meson/axg-audio.c
> +++ b/drivers/clk/meson/axg-audio.c
> @@ -12,6 +12,7 @@
> #include <linux/platform_device.h>
> #include <linux/regmap.h>
> #include <linux/reset.h>
> +#include <linux/reset-controller.h>
> #include <linux/slab.h>
>
> #include "axg-audio.h"
> @@ -918,6 +919,84 @@ static int devm_clk_get_enable(struct device *dev, char *id)
> return 0;
> }
>
> +struct axg_audio_reset_data {
> + struct reset_controller_dev rstc;
> + struct regmap *map;
> + unsigned int offset;
> +};
> +
> +static void axg_audio_reset_reg_and_bit(struct axg_audio_reset_data *rst,
> + unsigned long id,
> + unsigned int *reg,
> + unsigned int *bit)
> +{
> + unsigned int stride = regmap_get_reg_stride(rst->map);
> +
> + *reg = (id / (stride * BITS_PER_BYTE)) * stride;
> + *reg += rst->offset;
> + *bit = id % (stride * BITS_PER_BYTE);
> +}
> +
> +static int axg_audio_reset_update(struct reset_controller_dev *rcdev,
> + unsigned long id, bool assert)
> +{
> + struct axg_audio_reset_data *rst =
> + container_of(rcdev, struct axg_audio_reset_data, rstc);
> + unsigned int offset, bit;
> +
> + axg_audio_reset_reg_and_bit(rst, id, &offset, &bit);
> +
> + regmap_update_bits(rst->map, offset, BIT(bit),
> + assert ? BIT(bit) : 0);
> +
> + return 0;
> +}
> +
> +static int axg_audio_reset_status(struct reset_controller_dev *rcdev,
> + unsigned long id)
> +{
> + struct axg_audio_reset_data *rst =
> + container_of(rcdev, struct axg_audio_reset_data, rstc);
> + unsigned int val, offset, bit;
> +
> + axg_audio_reset_reg_and_bit(rst, id, &offset, &bit);
> +
> + regmap_read(rst->map, offset, &val);
> +
> + return !!(val & BIT(bit));
> +}
> +
> +static int axg_audio_reset_assert(struct reset_controller_dev *rcdev,
> + unsigned long id)
> +{
> + return axg_audio_reset_update(rcdev, id, true);
> +}
> +
> +static int axg_audio_reset_deassert(struct reset_controller_dev *rcdev,
> + unsigned long id)
> +{
> + return axg_audio_reset_update(rcdev, id, false);
> +}
> +
> +static int axg_audio_reset_toggle(struct reset_controller_dev *rcdev,
> + unsigned long id)
> +{
> + int ret;
> +
> + ret = axg_audio_reset_assert(rcdev, id);
> + if (ret)
> + return ret;
> +
> + return axg_audio_reset_deassert(rcdev, id);
> +}
> +
> +static const struct reset_control_ops axg_audio_rstc_ops = {
> + .assert = axg_audio_reset_assert,
> + .deassert = axg_audio_reset_deassert,
> + .reset = axg_audio_reset_toggle,
> + .status = axg_audio_reset_status,
> +};
> +
> static const struct regmap_config axg_audio_regmap_cfg = {
> .reg_bits = 32,
> .val_bits = 32,
> @@ -927,12 +1006,15 @@ static const struct regmap_config axg_audio_regmap_cfg = {
>
> struct audioclk_data {
> struct clk_hw_onecell_data *hw_onecell_data;
> + unsigned int reset_offset;
> + unsigned int reset_num;
> };
>
> static int axg_audio_clkc_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> const struct audioclk_data *data;
> + struct axg_audio_reset_data *rst;
> struct regmap *map;
> struct resource *res;
> void __iomem *regs;
> @@ -984,8 +1066,27 @@ static int axg_audio_clkc_probe(struct platform_device *pdev)
> }
> }
>
> - return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
> - data->hw_onecell_data);
> + ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
> + data->hw_onecell_data);
> + if (ret)
> + return ret;
> +
> + /* Stop here if there is no reset */
> + if (!data->reset_num)
> + return 0;
> +
> + rst = devm_kzalloc(dev, sizeof(*rst), GFP_KERNEL);
> + if (!rst)
> + return -ENOMEM;
> +
> + rst->map = map;
> + rst->offset = data->reset_offset;
> + rst->rstc.nr_resets = data->reset_num;
> + rst->rstc.ops = &axg_audio_rstc_ops;
> + rst->rstc.of_node = dev->of_node;
> + rst->rstc.owner = THIS_MODULE;
> +
> + return devm_reset_controller_register(dev, &rst->rstc);
> }
>
> static const struct audioclk_data axg_audioclk_data = {
> @@ -994,6 +1095,8 @@ static const struct audioclk_data axg_audioclk_data = {
>
> static const struct audioclk_data g12a_audioclk_data = {
> .hw_onecell_data = &g12a_audio_hw_onecell_data,
> + .reset_offset = AUDIO_SW_RESET,
> + .reset_num = 26,
> };
>
> static const struct of_device_id clkc_match_table[] = {
> diff --git a/drivers/clk/meson/axg-audio.h b/drivers/clk/meson/axg-audio.h
> index 5d972d55d6c7..c00e28b2e1a9 100644
> --- a/drivers/clk/meson/axg-audio.h
> +++ b/drivers/clk/meson/axg-audio.h
> @@ -22,6 +22,7 @@
> #define AUDIO_MCLK_F_CTRL 0x018
> #define AUDIO_MST_PAD_CTRL0 0x01c
> #define AUDIO_MST_PAD_CTRL1 0x020
> +#define AUDIO_SW_RESET 0x024
> #define AUDIO_MST_A_SCLK_CTRL0 0x040
> #define AUDIO_MST_A_SCLK_CTRL1 0x044
> #define AUDIO_MST_B_SCLK_CTRL0 0x048
>
Reviewed-by: Neil Armstrong <narmstrong@...libre.com>
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