Re: [PATCH v4 1/3] PCI: rockchip: Simplify clock handling by using clk_bulk*() function

Manivannan Sadhasivam
2024-08-15T16:11:44Z

On Tue, Jun 25, 2024 at 04:10:32PM +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,
> the clock handling for the core clocks becomes much simpler.
>

Why can't you just use devm_clk_bulk_get_all()? This gets rid of hardcoding the
clock names in driver.

- Mani

> Signed-off-by: Anand Moon <linux.amoon@gmail.com>
> ---
> 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 | 68 ++++----------------------
> drivers/pci/controller/pcie-rockchip.h | 15 ++++--
> 2 files changed, 21 insertions(+), 62 deletions(-)
>
> diff --git a/drivers/pci/controller/pcie-rockchip.c b/drivers/pci/controller/pcie-rockchip.c
> index 0ef2e622d36e..804135511528 100644
> --- a/drivers/pci/controller/pcie-rockchip.c
> +++ b/drivers/pci/controller/pcie-rockchip.c
> @@ -30,7 +30,7 @@ int rockchip_pcie_parse_dt(struct rockchip_pcie *rockchip)
> struct platform_device *pdev = to_platform_device(dev);
> struct device_node *node = dev->of_node;
> struct resource *regs;
> - int err;
> + int err, i;
>
> if (rockchip->is_rc) {
> regs = platform_get_resource_byname(pdev,
> @@ -127,29 +127,12 @@ 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);
> - }
> + for (i = 0; i < ROCKCHIP_NUM_CLKS; i++)
> + rockchip->clks[i].id = rockchip_pci_clks[i];
>
> - 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);
> - }
> + err = devm_clk_bulk_get(dev, ROCKCHIP_NUM_CLKS, rockchip->clks);
> + if (err)
> + return dev_err_probe(dev, err, "failed to get clocks\n");
>
> return 0;
> }
> @@ -372,39 +355,11 @@ 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 +367,7 @@ 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..72346e17e45e 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>
> @@ -287,6 +288,15 @@
> (((c) << ((b) * 8 + 5)) & \
> ROCKCHIP_PCIE_CORE_EP_FUNC_BAR_CFG_BAR_CTRL_MASK(b))
>
> +#define ROCKCHIP_NUM_CLKS ARRAY_SIZE(rockchip_pci_clks)
> +
> +static const char * const rockchip_pci_clks[] = {
> + "aclk",
> + "aclk-perf",
> + "hclk",
> + "pm",
> +};
> +
> struct rockchip_pcie {
> void __iomem *reg_base; /* DT axi-base */
> void __iomem *apb_base; /* DT apb-base */
> @@ -299,10 +309,7 @@ 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[ROCKCHIP_NUM_CLKS];
> struct regulator *vpcie12v; /* 12V power supply */
> struct regulator *vpcie3v3; /* 3.3V power supply */
> struct regulator *vpcie1v8; /* 1.8V power supply */
>
> base-commit: 35bb670d65fc0f80c62383ab4f2544cec85ac57a
> --
> 2.44.0
>
>

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