linux-kernel - Re: [PATCH 2/2] i3c: dw: Add optional apb clock

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Date: Tue, 18 Jun 2024 22:05:58 +0200
From: Alexandre Belloni <alexandre.belloni@...tlin.com>
To: Aniket <aniketmaurya@...gle.com>
Cc: Jeremy Kerr <jk@...econstruct.com.au>, Joel Stanley <joel@....id.au>,
	Billy Tsai <billy_tsai@...eedtech.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	linux-i3c@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH 2/2] i3c: dw: Add optional apb clock

Hello,

On 11/06/2024 17:16:00+0000, Aniket wrote:
> Besides the core clock, IP also has an apb
> interface clock. Add an optional hook for
> the same and appropriately enable and disable.
> 
> Signed-off-by: Aniket <aniketmaurya@...gle.com>
> ---
>  drivers/i3c/master/dw-i3c-master.c | 12 ++++++++++++
>  drivers/i3c/master/dw-i3c-master.h |  1 +
>  2 files changed, 13 insertions(+)
> 
> diff --git a/drivers/i3c/master/dw-i3c-master.c b/drivers/i3c/master/dw-i3c-master.c
> index 77a2a1c3fd1d..41cdfd6741e3 100644
> --- a/drivers/i3c/master/dw-i3c-master.c
> +++ b/drivers/i3c/master/dw-i3c-master.c
> @@ -1470,12 +1470,20 @@ int dw_i3c_common_probe(struct dw_i3c_master *master,
>  	if (IS_ERR(master->core_clk))
>  		return PTR_ERR(master->core_clk);
>  
> +	master->pclk = devm_clk_get_optional(&pdev->dev, "pclk");
> +	if (IS_ERR(master->pclk))
> +		return PTR_ERR(master->pclk);
> +

I guess you need to update the device tree binding documentation too.

>  	master->core_rst = devm_reset_control_get_optional_exclusive(&pdev->dev,
>  								    "core_rst");
>  	if (IS_ERR(master->core_rst))
>  		return PTR_ERR(master->core_rst);
>  
>  	ret = clk_prepare_enable(master->core_clk);
> +	if (ret)
> +		return ret;
> +
> +	ret = clk_prepare_enable(master->pclk);
>  	if (ret)
>  		goto err_disable_core_clk;
>  
> @@ -1520,6 +1528,8 @@ int dw_i3c_common_probe(struct dw_i3c_master *master,
>  err_assert_rst:
>  	reset_control_assert(master->core_rst);
>  
> +	clk_disable_unprepare(master->pclk);
> +
>  err_disable_core_clk:
>  	clk_disable_unprepare(master->core_clk);
>  
> @@ -1533,6 +1543,8 @@ void dw_i3c_common_remove(struct dw_i3c_master *master)
>  
>  	reset_control_assert(master->core_rst);
>  
> +	clk_disable_unprepare(master->pclk);
> +
>  	clk_disable_unprepare(master->core_clk);
>  }
>  EXPORT_SYMBOL_GPL(dw_i3c_common_remove);
> diff --git a/drivers/i3c/master/dw-i3c-master.h b/drivers/i3c/master/dw-i3c-master.h
> index 8cb617b8147e..50c38e790c0e 100644
> --- a/drivers/i3c/master/dw-i3c-master.h
> +++ b/drivers/i3c/master/dw-i3c-master.h
> @@ -36,6 +36,7 @@ struct dw_i3c_master {
>  	void __iomem *regs;
>  	struct reset_control *core_rst;
>  	struct clk *core_clk;
> +	struct clk *pclk;
>  	char version[5];
>  	char type[5];
>  	bool ibi_capable;
> -- 
> 2.45.2.505.gda0bf45e8d-goog
> 

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com