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Subject: Re: [PATCH 2/2] clk: meson: axg-audio: add g12a reset support
To:     Jerome Brunet <jbrunet@baylibre.com>
Cc:     Kevin Hilman <khilman@baylibre.com>,
        linux-amlogic@lists.infradead.org, linux-clk@vger.kernel.org,
        linux-kernel@vger.kernel.org
References: <20190703122614.3579-1-jbrunet@baylibre.com>
 <20190703122614.3579-3-jbrunet@baylibre.com>
From:   Neil Armstrong <narmstrong@baylibre.com>
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Organization: Baylibre
Message-ID: <87b55e1e-7738-5fb7-405b-f1418d258dbd@baylibre.com>
Date:   Mon, 22 Jul 2019 09:24:39 +0200
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 03/07/2019 14:26, 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@baylibre.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 8028ff6f6610..ce163bd03aad 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"
> @@ -916,6 +917,84 @@ static int axg_register_clk_hw_inputs(struct device *dev,
>  	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,
> @@ -925,12 +1004,15 @@ 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;
> @@ -1005,8 +1087,27 @@ 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 ret = devm_reset_controller_register(dev, &rst->rstc);
>  }
>  
>  static const struct audioclk_data axg_audioclk_data = {
> @@ -1015,6 +1116,8 @@ 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@baylibre.com>