linux-kernel - Re: [PATCH v6 19/37] clk: scmi: port driver to the new scmi_clk_proto

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Message-ID: <20210310141914.GI8355@e120937-lin>
Date:   Wed, 10 Mar 2021 14:19:14 +0000
From:   Cristian Marussi <cristian.marussi@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Stephen Boyd <sboyd@...nel.org>
Cc:     sudeep.holla@....com, lukasz.luba@....com,
        james.quinlan@...adcom.com, Jonathan.Cameron@...wei.com,
        f.fainelli@...il.com, etienne.carriere@...aro.org,
        thara.gopinath@...aro.org, vincent.guittot@...aro.org,
        souvik.chakravarty@....com,
        Michael Turquette <mturquette@...libre.com>
Subject: Re: [PATCH v6 19/37] clk: scmi: port driver to the new
 scmi_clk_proto_ops interface

Hi Stephen,

any chance you could have a look at this and, possibly, ack ?

The rationale for the change in the SCMI layer interface is in the
series cover-letter here:

https://lore.kernel.org/lkml/20210202221555.41167-1-cristian.marussi@arm.com/

Thanks

Cristian

On Tue, Feb 02, 2021 at 10:15:37PM +0000, Cristian Marussi wrote:
> Port driver to the new SCMI Clock interface based on protocol handles
> and common devm_get_ops().
> 
> Cc: Michael Turquette <mturquette@...libre.com>
> Cc: Stephen Boyd <sboyd@...nel.org>
> Signed-off-by: Cristian Marussi <cristian.marussi@....com>
> ---
> v4 --> v5
> - using renamed devm_get/put_protocol
> ---
>  drivers/clk/clk-scmi.c | 27 +++++++++++++++++----------
>  1 file changed, 17 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/clk/clk-scmi.c b/drivers/clk/clk-scmi.c
> index c754dfbb73fd..f3da3042d09c 100644
> --- a/drivers/clk/clk-scmi.c
> +++ b/drivers/clk/clk-scmi.c
> @@ -2,7 +2,7 @@
>  /*
>   * System Control and Power Interface (SCMI) Protocol based clock driver
>   *
> - * Copyright (C) 2018 ARM Ltd.
> + * Copyright (C) 2018-2020 ARM Ltd.
>   */
>  
>  #include <linux/clk-provider.h>
> @@ -13,11 +13,13 @@
>  #include <linux/scmi_protocol.h>
>  #include <asm/div64.h>
>  
> +static const struct scmi_clk_proto_ops *clk_ops;
> +
>  struct scmi_clk {
>  	u32 id;
>  	struct clk_hw hw;
>  	const struct scmi_clock_info *info;
> -	const struct scmi_handle *handle;
> +	const struct scmi_protocol_handle *ph;
>  };
>  
>  #define to_scmi_clk(clk) container_of(clk, struct scmi_clk, hw)
> @@ -29,7 +31,7 @@ static unsigned long scmi_clk_recalc_rate(struct clk_hw *hw,
>  	u64 rate;
>  	struct scmi_clk *clk = to_scmi_clk(hw);
>  
> -	ret = clk->handle->clk_ops->rate_get(clk->handle, clk->id, &rate);
> +	ret = clk_ops->rate_get(clk->ph, clk->id, &rate);
>  	if (ret)
>  		return 0;
>  	return rate;
> @@ -69,21 +71,21 @@ static int scmi_clk_set_rate(struct clk_hw *hw, unsigned long rate,
>  {
>  	struct scmi_clk *clk = to_scmi_clk(hw);
>  
> -	return clk->handle->clk_ops->rate_set(clk->handle, clk->id, rate);
> +	return clk_ops->rate_set(clk->ph, clk->id, rate);
>  }
>  
>  static int scmi_clk_enable(struct clk_hw *hw)
>  {
>  	struct scmi_clk *clk = to_scmi_clk(hw);
>  
> -	return clk->handle->clk_ops->enable(clk->handle, clk->id);
> +	return clk_ops->enable(clk->ph, clk->id);
>  }
>  
>  static void scmi_clk_disable(struct clk_hw *hw)
>  {
>  	struct scmi_clk *clk = to_scmi_clk(hw);
>  
> -	clk->handle->clk_ops->disable(clk->handle, clk->id);
> +	clk_ops->disable(clk->ph, clk->id);
>  }
>  
>  static const struct clk_ops scmi_clk_ops = {
> @@ -142,11 +144,16 @@ static int scmi_clocks_probe(struct scmi_device *sdev)
>  	struct device *dev = &sdev->dev;
>  	struct device_node *np = dev->of_node;
>  	const struct scmi_handle *handle = sdev->handle;
> +	struct scmi_protocol_handle *ph;
>  
> -	if (!handle || !handle->clk_ops)
> +	if (!handle)
>  		return -ENODEV;
>  
> -	count = handle->clk_ops->count_get(handle);
> +	clk_ops = handle->devm_get_protocol(sdev, SCMI_PROTOCOL_CLOCK, &ph);
> +	if (IS_ERR(clk_ops))
> +		return PTR_ERR(clk_ops);
> +
> +	count = clk_ops->count_get(ph);
>  	if (count < 0) {
>  		dev_err(dev, "%pOFn: invalid clock output count\n", np);
>  		return -EINVAL;
> @@ -167,14 +174,14 @@ static int scmi_clocks_probe(struct scmi_device *sdev)
>  		if (!sclk)
>  			return -ENOMEM;
>  
> -		sclk->info = handle->clk_ops->info_get(handle, idx);
> +		sclk->info = clk_ops->info_get(ph, idx);
>  		if (!sclk->info) {
>  			dev_dbg(dev, "invalid clock info for idx %d\n", idx);
>  			continue;
>  		}
>  
>  		sclk->id = idx;
> -		sclk->handle = handle;
> +		sclk->ph = ph;
>  
>  		err = scmi_clk_ops_init(dev, sclk);
>  		if (err) {
> -- 
> 2.17.1
>