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Message-ID: <20241012060847.6teuutvy2u2es2qw@thinkpad>
Date: Sat, 12 Oct 2024 11:38:47 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Anand Moon <linux.amoon@...il.com>
Cc: Shawn Lin <shawn.lin@...k-chips.com>,
Lorenzo Pieralisi <lpieralisi@...nel.org>,
Krzysztof Wilczyński <kw@...ux.com>,
Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
Heiko Stuebner <heiko@...ech.de>,
Philipp Zabel <p.zabel@...gutronix.de>,
"open list:PCIE DRIVER FOR ROCKCHIP" <linux-pci@...r.kernel.org>,
"open list:PCIE DRIVER FOR ROCKCHIP" <linux-rockchip@...ts.infradead.org>,
"moderated list:ARM/Rockchip SoC support" <linux-arm-kernel@...ts.infradead.org>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 1/3] PCI: rockchip: Simplify clock handling by using
clk_bulk*() function
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@...il.com>
With above changes,
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
- 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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