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Message-ID: <20241202151150.7393-2-linux.amoon@gmail.com>
Date: Mon, 2 Dec 2024 20:41:42 +0530
From: Anand Moon <linux.amoon@...il.com>
To: Shawn Lin <shawn.lin@...k-chips.com>,
Lorenzo Pieralisi <lpieralisi@...nel.org>,
Krzysztof Wilczyński <kw@...ux.com>,
Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
Rob Herring <robh@...nel.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Heiko Stuebner <heiko@...ech.de>
Cc: Anand Moon <linux.amoon@...il.com>,
Philipp Zabel <p.zabel@...gutronix.de>,
linux-pci@...r.kernel.org,
linux-rockchip@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v11 1/3] PCI: rockchip: Simplify clock handling by using clk_bulk*() function
Currently, the driver acquires clks and prepare enable/disable unprepare
the clks individually thereby making the driver complex to read.
But this can be simplified by using the clk_bulk*() APIs.
Use devm_clk_bulk_get_all() API to acquire all the clks and use
clk_bulk_prepare_enable() to prepare enable clks
and clk_bulk_disable_unprepare() APIs disable unprepare them in bulk.
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Signed-off-by: Anand Moon <linux.amoon@...il.com>
---
V11: None
V10: None
v9: Re write the commmit message.
v8: Improve the description of the code changes in commit messagee.
Add Rb: Manivannan
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 b9ade7632e11..53aaba03aca6 100644
--- a/drivers/pci/controller/pcie-rockchip.c
+++ b/drivers/pci/controller/pcie-rockchip.c
@@ -129,29 +129,9 @@ int rockchip_pcie_parse_dt(struct rockchip_pcie *rockchip)
return dev_err_probe(dev, PTR_ERR(rockchip->perst_gpio),
"failed to get PERST# 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;
}
@@ -375,39 +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);
@@ -415,10 +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 a51b087ce878..f79c0a1cbbd0 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>
@@ -321,10 +322,8 @@ 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 */
--
2.47.0
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