linux-kernel - Re: [PATCH 1/5] phy: cadence-torrent: Migrate to clk

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Message-ID: <e6c0b780-d5d5-f641-7e9f-d2c917eb4b51@ti.com>
Date:   Wed, 15 Sep 2021 09:21:30 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Swapnil Jakhade <sjakhade@...ence.com>, <vkoul@...nel.org>,
        <robh+dt@...nel.org>, <linux-phy@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
CC:     <mparab@...ence.com>, <lokeshvutla@...com>, <a-govindraju@...com>
Subject: Re: [PATCH 1/5] phy: cadence-torrent: Migrate to clk_hw based
 registration and OF APIs

Hi Swapnil,

On 08/09/21 11:56 pm, Swapnil Jakhade wrote:
> Use clk_hw based provider APIs to register clks.

Please explain the reasoning for moving to clk_hw based API.

Thanks,
Kishon
> 
> Signed-off-by: Swapnil Jakhade <sjakhade@...ence.com>
> ---
>  drivers/phy/cadence/phy-cadence-torrent.c | 30 ++++++++++++++---------
>  1 file changed, 19 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/phy/cadence/phy-cadence-torrent.c b/drivers/phy/cadence/phy-cadence-torrent.c
> index 415ace64adc5..ecb1aa883c05 100644
> --- a/drivers/phy/cadence/phy-cadence-torrent.c
> +++ b/drivers/phy/cadence/phy-cadence-torrent.c
> @@ -235,6 +235,8 @@
>  #define PHY_PMA_CMN_CTRL2		0x0001U
>  #define PHY_PMA_PLL_RAW_CTRL		0x0003U
>  
> +#define CDNS_TORRENT_OUTPUT_CLOCKS	1
> +
>  static const char * const clk_names[] = {
>  	[CDNS_TORRENT_REFCLK_DRIVER] = "refclk-driver",
>  };
> @@ -333,8 +335,7 @@ struct cdns_torrent_phy {
>  	struct regmap_field *phy_pma_pll_raw_ctrl;
>  	struct regmap_field *phy_reset_ctrl;
>  	struct regmap_field *phy_pcs_iso_link_ctrl_1[MAX_NUM_LANES];
> -	struct clk *clks[CDNS_TORRENT_REFCLK_DRIVER + 1];
> -	struct clk_onecell_data clk_data;
> +	struct clk_hw_onecell_data *clk_hw_data;
>  };
>  
>  enum phy_powerstate {
> @@ -1659,8 +1660,9 @@ static int cdns_torrent_derived_refclk_register(struct cdns_torrent_phy *cdns_ph
>  	const char *parent_name;
>  	struct regmap *regmap;
>  	char clk_name[100];
> +	struct clk_hw *hw;
>  	struct clk *clk;
> -	int i;
> +	int i, ret;
>  
>  	derived_refclk = devm_kzalloc(dev, sizeof(*derived_refclk), GFP_KERNEL);
>  	if (!derived_refclk)
> @@ -1706,11 +1708,12 @@ static int cdns_torrent_derived_refclk_register(struct cdns_torrent_phy *cdns_ph
>  
>  	derived_refclk->hw.init = init;
>  
> -	clk = devm_clk_register(dev, &derived_refclk->hw);
> -	if (IS_ERR(clk))
> -		return PTR_ERR(clk);
> +	hw = &derived_refclk->hw;
> +	ret = devm_clk_hw_register(dev, hw);
> +	if (ret)
> +		return ret;
>  
> -	cdns_phy->clks[CDNS_TORRENT_REFCLK_DRIVER] = clk;
> +	cdns_phy->clk_hw_data->hws[CDNS_TORRENT_REFCLK_DRIVER] = hw;
>  
>  	return 0;
>  }
> @@ -2188,18 +2191,23 @@ static int cdns_torrent_clk_register(struct cdns_torrent_phy *cdns_phy)
>  {
>  	struct device *dev = cdns_phy->dev;
>  	struct device_node *node = dev->of_node;
> +	struct clk_hw_onecell_data *data;
>  	int ret;
>  
> +	data = devm_kzalloc(dev, struct_size(data, hws, CDNS_TORRENT_OUTPUT_CLOCKS), GFP_KERNEL);
> +	if (!data)
> +		return -ENOMEM;
> +
> +	data->num = CDNS_TORRENT_OUTPUT_CLOCKS;
> +	cdns_phy->clk_hw_data = data;
> +
>  	ret = cdns_torrent_derived_refclk_register(cdns_phy);
>  	if (ret) {
>  		dev_err(dev, "failed to register derived refclk\n");
>  		return ret;
>  	}
>  
> -	cdns_phy->clk_data.clks = cdns_phy->clks;
> -	cdns_phy->clk_data.clk_num = CDNS_TORRENT_REFCLK_DRIVER + 1;
> -
> -	ret = of_clk_add_provider(node, of_clk_src_onecell_get, &cdns_phy->clk_data);
> +	ret = of_clk_add_hw_provider(node, of_clk_hw_onecell_get, data);
>  	if (ret) {
>  		dev_err(dev, "Failed to add clock provider: %s\n", node->name);
>  		return ret;
>