Re: [PATCH v7 1/3] PCI: rockchip: Simplify clock handling by using clk_bulk*() function

[Manivannan Sadhasivam]

On Sat, Oct 12, 2024 at 10:36:03AM +0530, Anand Moon wrote:
> Refactor the clock handling in the Rockchip PCIe driver,
> introducing a more robust and efficient method for enabling and
> disabling clocks using clk_bulk*() API. Using the clk_bulk APIs,

I think I mentioned earlier to use impreative tone in commit messages.

> the clock handling for the core clocks becomes much simpler.
> 

Could you please elaborate how? i.e., devm_clk_bulk_get_all() allows the driver
to get all clocks defined in the DT thereby removing the hardcoded clock names
in the driver.

> - Replace devm_clk_get() with devm_clk_bulk_get_all().
> - Replace clk_prepare_enable() with clk_bulk_prepare_enable().
> - Replace clk_disable_unprepare() with clk_bulk_disable_unprepare().
> 
> Signed-off-by: Anand Moon <linux.amoon@xxxxxxxxx>

With above changes,

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>

- Mani

> ---
> v7: Update the functional change in commmit message.
> v6: None.
> v5: switch to use use devm_clk_bulk_get_all()? gets rid of hardcoding the
>        clock names in driver.
> v4: use dev_err_probe for error patch.
> v3: Fix typo in commit message, dropped reported by.
> v2: Fix compilation error reported by Intel test robot.
> ---
>  drivers/pci/controller/pcie-rockchip.c | 65 +++-----------------------
>  drivers/pci/controller/pcie-rockchip.h |  7 ++-
>  2 files changed, 10 insertions(+), 62 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-rockchip.c b/drivers/pci/controller/pcie-rockchip.c
> index c07d7129f1c7..2777ef0cb599 100644
> --- a/drivers/pci/controller/pcie-rockchip.c
> +++ b/drivers/pci/controller/pcie-rockchip.c
> @@ -127,29 +127,9 @@ int rockchip_pcie_parse_dt(struct rockchip_pcie *rockchip)
>  					     "failed to get ep GPIO\n");
>  	}
>  
> -	rockchip->aclk_pcie = devm_clk_get(dev, "aclk");
> -	if (IS_ERR(rockchip->aclk_pcie)) {
> -		dev_err(dev, "aclk clock not found\n");
> -		return PTR_ERR(rockchip->aclk_pcie);
> -	}
> -
> -	rockchip->aclk_perf_pcie = devm_clk_get(dev, "aclk-perf");
> -	if (IS_ERR(rockchip->aclk_perf_pcie)) {
> -		dev_err(dev, "aclk_perf clock not found\n");
> -		return PTR_ERR(rockchip->aclk_perf_pcie);
> -	}
> -
> -	rockchip->hclk_pcie = devm_clk_get(dev, "hclk");
> -	if (IS_ERR(rockchip->hclk_pcie)) {
> -		dev_err(dev, "hclk clock not found\n");
> -		return PTR_ERR(rockchip->hclk_pcie);
> -	}
> -
> -	rockchip->clk_pcie_pm = devm_clk_get(dev, "pm");
> -	if (IS_ERR(rockchip->clk_pcie_pm)) {
> -		dev_err(dev, "pm clock not found\n");
> -		return PTR_ERR(rockchip->clk_pcie_pm);
> -	}
> +	rockchip->num_clks = devm_clk_bulk_get_all(dev, &rockchip->clks);
> +	if (rockchip->num_clks < 0)
> +		return dev_err_probe(dev, err, "failed to get clocks\n");
>  
>  	return 0;
>  }
> @@ -372,39 +352,11 @@ int rockchip_pcie_enable_clocks(struct rockchip_pcie *rockchip)
>  	struct device *dev = rockchip->dev;
>  	int err;
>  
> -	err = clk_prepare_enable(rockchip->aclk_pcie);
> -	if (err) {
> -		dev_err(dev, "unable to enable aclk_pcie clock\n");
> -		return err;
> -	}
> -
> -	err = clk_prepare_enable(rockchip->aclk_perf_pcie);
> -	if (err) {
> -		dev_err(dev, "unable to enable aclk_perf_pcie clock\n");
> -		goto err_aclk_perf_pcie;
> -	}
> -
> -	err = clk_prepare_enable(rockchip->hclk_pcie);
> -	if (err) {
> -		dev_err(dev, "unable to enable hclk_pcie clock\n");
> -		goto err_hclk_pcie;
> -	}
> -
> -	err = clk_prepare_enable(rockchip->clk_pcie_pm);
> -	if (err) {
> -		dev_err(dev, "unable to enable clk_pcie_pm clock\n");
> -		goto err_clk_pcie_pm;
> -	}
> +	err = clk_bulk_prepare_enable(rockchip->num_clks, rockchip->clks);
> +	if (err)
> +		return dev_err_probe(dev, err, "failed to enable clocks\n");
>  
>  	return 0;
> -
> -err_clk_pcie_pm:
> -	clk_disable_unprepare(rockchip->hclk_pcie);
> -err_hclk_pcie:
> -	clk_disable_unprepare(rockchip->aclk_perf_pcie);
> -err_aclk_perf_pcie:
> -	clk_disable_unprepare(rockchip->aclk_pcie);
> -	return err;
>  }
>  EXPORT_SYMBOL_GPL(rockchip_pcie_enable_clocks);
>  
> @@ -412,10 +364,7 @@ void rockchip_pcie_disable_clocks(void *data)
>  {
>  	struct rockchip_pcie *rockchip = data;
>  
> -	clk_disable_unprepare(rockchip->clk_pcie_pm);
> -	clk_disable_unprepare(rockchip->hclk_pcie);
> -	clk_disable_unprepare(rockchip->aclk_perf_pcie);
> -	clk_disable_unprepare(rockchip->aclk_pcie);
> +	clk_bulk_disable_unprepare(rockchip->num_clks, rockchip->clks);
>  }
>  EXPORT_SYMBOL_GPL(rockchip_pcie_disable_clocks);
>  
> diff --git a/drivers/pci/controller/pcie-rockchip.h b/drivers/pci/controller/pcie-rockchip.h
> index 6111de35f84c..bebab80c9553 100644
> --- a/drivers/pci/controller/pcie-rockchip.h
> +++ b/drivers/pci/controller/pcie-rockchip.h
> @@ -11,6 +11,7 @@
>  #ifndef _PCIE_ROCKCHIP_H
>  #define _PCIE_ROCKCHIP_H
>  
> +#include <linux/clk.h>
>  #include <linux/kernel.h>
>  #include <linux/pci.h>
>  #include <linux/pci-ecam.h>
> @@ -299,10 +300,8 @@ struct rockchip_pcie {
>  	struct	reset_control *pm_rst;
>  	struct	reset_control *aclk_rst;
>  	struct	reset_control *pclk_rst;
> -	struct	clk *aclk_pcie;
> -	struct	clk *aclk_perf_pcie;
> -	struct	clk *hclk_pcie;
> -	struct	clk *clk_pcie_pm;
> +	struct  clk_bulk_data *clks;
> +	int	num_clks;
>  	struct	regulator *vpcie12v; /* 12V power supply */
>  	struct	regulator *vpcie3v3; /* 3.3V power supply */
>  	struct	regulator *vpcie1v8; /* 1.8V power supply */
> -- 
> 2.44.0
> 

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