linux-kernel - RE: [PATCH v4 1/2] clk: Provide managed helper to get and enable bulk clocks

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Date: Wed, 31 Jan 2024 10:34:37 +0530
From: "Alim Akhtar" <alim.akhtar@...sung.com>
To: "'Shradha Todi'" <shradha.t@...sung.com>, <linux-clk@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-samsung-soc@...r.kernel.org>
Cc: <mturquette@...libre.com>, <sboyd@...nel.org>, <jingoohan1@...il.com>,
	<lpieralisi@...nel.org>, <kw@...ux.com>, <robh@...nel.org>,
	<bhelgaas@...gle.com>, <krzysztof.kozlowski@...aro.org>,
	<linux@...linux.org.uk>, <m.szyprowski@...sung.com>,
	<manivannan.sadhasivam@...aro.org>, <pankaj.dubey@...sung.com>
Subject: RE: [PATCH v4 1/2] clk: Provide managed helper to get and enable
 bulk clocks

Hi Shradha

> -----Original Message-----
> From: Shradha Todi <shradha.t@...sung.com>
> Sent: Wednesday, January 24, 2024 4:09 PM
> To: linux-clk@...r.kernel.org; linux-kernel@...r.kernel.org; linux-
> pci@...r.kernel.org; linux-arm-kernel@...ts.infradead.org; linux-samsung-
> soc@...r.kernel.org
> Cc: mturquette@...libre.com; sboyd@...nel.org; jingoohan1@...il.com;
> lpieralisi@...nel.org; kw@...ux.com; robh@...nel.org;
> bhelgaas@...gle.com; krzysztof.kozlowski@...aro.org;
> alim.akhtar@...sung.com; linux@...linux.org.uk;
> m.szyprowski@...sung.com; manivannan.sadhasivam@...aro.org;
> pankaj.dubey@...sung.com; Shradha Todi <shradha.t@...sung.com>
> Subject: [PATCH v4 1/2] clk: Provide managed helper to get and enable bulk
> clocks
> 
> Provide a managed devm_clk_bulk* wrapper to get and enable all bulk clocks
> in order to simplify drivers that keeps all clocks enabled for the time of driver
> operation.
> 
> Suggested-by: Marek Szyprowski <m.szyprowski@...sung.com>
> Signed-off-by: Shradha Todi <shradha.t@...sung.com>
> ---

Reviewed-by: Alim Akhtar <alim.akhtar@...sung.com>

>  drivers/clk/clk-devres.c | 40
> ++++++++++++++++++++++++++++++++++++++++
>  include/linux/clk.h      | 24 ++++++++++++++++++++++++
>  2 files changed, 64 insertions(+)
> 
> diff --git a/drivers/clk/clk-devres.c b/drivers/clk/clk-devres.c index
> 4fb4fd4b06bd..cbbd2cc339c3 100644
> --- a/drivers/clk/clk-devres.c
> +++ b/drivers/clk/clk-devres.c
> @@ -182,6 +182,46 @@ int __must_check devm_clk_bulk_get_all(struct
> device *dev,  }  EXPORT_SYMBOL_GPL(devm_clk_bulk_get_all);
> 
> +static void devm_clk_bulk_release_all_enable(struct device *dev, void
> +*res) {
> +	struct clk_bulk_devres *devres = res;
> +
> +	clk_bulk_disable_unprepare(devres->num_clks, devres->clks);
> +	clk_bulk_put_all(devres->num_clks, devres->clks); }
> +
> +int __must_check devm_clk_bulk_get_all_enable(struct device *dev,
> +					      struct clk_bulk_data **clks) {
> +	struct clk_bulk_devres *devres;
> +	int ret;
> +
> +	devres = devres_alloc(devm_clk_bulk_release_all_enable,
> +			      sizeof(*devres), GFP_KERNEL);
> +	if (!devres)
> +		return -ENOMEM;
> +
> +	ret = clk_bulk_get_all(dev, &devres->clks);
> +	if (ret > 0) {
> +		*clks = devres->clks;
> +		devres->num_clks = ret;
> +	} else {
> +		devres_free(devres);
> +		return ret;
> +	}
> +
> +	ret = clk_bulk_prepare_enable(devres->num_clks, *clks);
> +	if (!ret) {
> +		devres_add(dev, devres);
> +	} else {
> +		clk_bulk_put_all(devres->num_clks, devres->clks);
> +		devres_free(devres);
> +	}
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(devm_clk_bulk_get_all_enable);
> +
>  static int devm_clk_match(struct device *dev, void *res, void *data)  {
>  	struct clk **c = res;
> diff --git a/include/linux/clk.h b/include/linux/clk.h index
> 1ef013324237..a005e709b7bd 100644
> --- a/include/linux/clk.h
> +++ b/include/linux/clk.h
> @@ -438,6 +438,23 @@ int __must_check
> devm_clk_bulk_get_optional(struct device *dev, int num_clks,  int
> __must_check devm_clk_bulk_get_all(struct device *dev,
>  				       struct clk_bulk_data **clks);
> 
> +/**
> + * devm_clk_bulk_get_all_enable - managed get multiple clk consumers
> and
> + *				  enable all clks
> + * @dev: device for clock "consumer"
> + * @clks: pointer to the clk_bulk_data table of consumer
> + *
> + * Returns success (0) or negative errno.
> + *
> + * This helper function allows drivers to get several clk
> + * consumers and enable all of them in one operation with management.
> + * The clks will automatically be disabled and freed when the device
> + * is unbound.
> + */
> +
> +int __must_check devm_clk_bulk_get_all_enable(struct device *dev,
> +					      struct clk_bulk_data **clks);
> +
>  /**
>   * devm_clk_get - lookup and obtain a managed reference to a clock
> producer.
>   * @dev: device for clock "consumer"
> @@ -960,6 +977,13 @@ static inline int __must_check
> devm_clk_bulk_get_all(struct device *dev,
>  	return 0;
>  }
> 
> +static inline int __must_check devm_clk_bulk_get_all_enable(struct device
> *dev,
> +						struct clk_bulk_data **clks)
> +{
> +
> +	return 0;
> +}
> +
>  static inline struct clk *devm_get_clk_from_child(struct device *dev,
>  				struct device_node *np, const char *con_id)
> {
> --
> 2.17.1