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

Anand Moon
2024-10-12T05:06:32Z

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.

- 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@gmail.com>
---
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