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Message-ID: <ZYBXEaUcNuKDswux@lizhi-Precision-Tower-5810>
Date: Mon, 18 Dec 2023 09:28:33 -0500
From: Frank Li <Frank.li@....com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: krzysztof.kozlowski@...aro.org, bhelgaas@...gle.com,
conor+dt@...nel.org, devicetree@...r.kernel.org, festevam@...il.com,
helgaas@...nel.org, hongxing.zhu@....com, imx@...ts.linux.dev,
kernel@...gutronix.de, krzysztof.kozlowski+dt@...aro.org,
kw@...ux.com, l.stach@...gutronix.de,
linux-arm-kernel@...ts.infradead.org, linux-imx@....com,
linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
lpieralisi@...nel.org, robh@...nel.org, s.hauer@...gutronix.de,
shawnguo@...nel.org
Subject: Re: [PATCH v4 01/15] PCI: imx6: Simplify clock handling by using
bulk_clk_*() function
On Sun, Dec 17, 2023 at 10:36:55PM +0530, Manivannan Sadhasivam wrote:
> On Sun, Dec 17, 2023 at 12:11:56AM -0500, Frank Li wrote:
> > Refactors the clock handling logic in the imx6 PCI driver by adding
> > clk_names[] define in drvdata . Simplifies the code and makes it more
> > maintainable, as future additions of SOC support will only require
> > straightforward changes.
> >
>
> Commit description should be in imperative mood as per
> Documentation/process/submitting-patches.rst:
>
> "Describe your changes in imperative mood, e.g. "make xyzzy do frotz"
> instead of "[This patch] makes xyzzy do frotz" or "[I] changed xyzzy
> to do frotz", as if you are giving orders to the codebase to change
> its behaviour."
How about:
Refactors the clock handling logic. Adds clk_names[] define in drvdata.
Using clk_bulk*() api simplifies the code.
>
> > Signed-off-by: Frank Li <Frank.Li@....com>
> > ---
> >
> > Notes:
> > Change from v3 to v4
> > - using clk_bulk_*() API
> > Change from v1 to v3
> > - none
> >
> > drivers/pci/controller/dwc/pci-imx6.c | 128 ++++++++------------------
> > 1 file changed, 38 insertions(+), 90 deletions(-)
> >
> > diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> > index 74703362aeec7..2086214345e9a 100644
> > --- a/drivers/pci/controller/dwc/pci-imx6.c
> > +++ b/drivers/pci/controller/dwc/pci-imx6.c
>
> [...]
>
> > static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
> > @@ -1305,32 +1265,19 @@ static int imx6_pcie_probe(struct platform_device *pdev)
> > return imx6_pcie->reset_gpio;
> > }
> >
> > - /* Fetch clocks */
> > - imx6_pcie->pcie_bus = devm_clk_get(dev, "pcie_bus");
> > - if (IS_ERR(imx6_pcie->pcie_bus))
> > - return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_bus),
> > - "pcie_bus clock source missing or invalid\n");
> > + while (imx6_pcie->drvdata->clk_names[imx6_pcie->clks_cnt]) {
> > + int i = imx6_pcie->clks_cnt;
> >
> > - imx6_pcie->pcie = devm_clk_get(dev, "pcie");
> > - if (IS_ERR(imx6_pcie->pcie))
> > - return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie),
> > - "pcie clock source missing or invalid\n");
> > + imx6_pcie->clks[i].id = imx6_pcie->drvdata->clk_names[i];
> > + imx6_pcie->clks_cnt++;
>
> You can just initialize clks_cnt in drv_data with sizeof() of clk_names.
sizeof will return pre allocated clk_names size, for here, it should be 6.
Not initilized string cnt.
or you have to duplicate two line
clk_names = {"clk1", "clk2", ...},
clks_cnt = ARRAY_SIZE({"clk1", "clk2", ...},
Anyway, it need copy to clks[i].id, count here is simple.
Frank
>
> > + }
> > +
> > + /* Fetch clocks */
> > + ret = devm_clk_bulk_get(dev, imx6_pcie->clks_cnt, imx6_pcie->clks);
> > + if (ret)
> > + return ret;
> >
> > switch (imx6_pcie->drvdata->variant) {
> > - case IMX6SX:
> > - imx6_pcie->pcie_inbound_axi = devm_clk_get(dev,
> > - "pcie_inbound_axi");
> > - if (IS_ERR(imx6_pcie->pcie_inbound_axi))
> > - return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_inbound_axi),
> > - "pcie_inbound_axi clock missing or invalid\n");
> > - break;
> > - case IMX8MQ:
> > - case IMX8MQ_EP:
> > - imx6_pcie->pcie_aux = devm_clk_get(dev, "pcie_aux");
> > - if (IS_ERR(imx6_pcie->pcie_aux))
> > - return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_aux),
> > - "pcie_aux clock source missing or invalid\n");
> > - fallthrough;
> > case IMX7D:
> > if (dbi_base->start == IMX8MQ_PCIE2_BASE_ADDR)
> > imx6_pcie->controller_id = 1;
> > @@ -1353,10 +1300,6 @@ static int imx6_pcie_probe(struct platform_device *pdev)
> > case IMX8MM_EP:
> > case IMX8MP:
> > case IMX8MP_EP:
> > - imx6_pcie->pcie_aux = devm_clk_get(dev, "pcie_aux");
> > - if (IS_ERR(imx6_pcie->pcie_aux))
> > - return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_aux),
> > - "pcie_aux clock source missing or invalid\n");
> > imx6_pcie->apps_reset = devm_reset_control_get_exclusive(dev,
> > "apps");
> > if (IS_ERR(imx6_pcie->apps_reset))
> > @@ -1372,14 +1315,6 @@ static int imx6_pcie_probe(struct platform_device *pdev)
> > default:
> > break;
> > }
> > - /* Don't fetch the pcie_phy clock, if it has abstract PHY driver */
> > - if (imx6_pcie->phy == NULL) {
> > - imx6_pcie->pcie_phy = devm_clk_get(dev, "pcie_phy");
> > - if (IS_ERR(imx6_pcie->pcie_phy))
> > - return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_phy),
> > - "pcie_phy clock source missing or invalid\n");
> > - }
> > -
> >
> > /* Grab turnoff reset */
> > imx6_pcie->turnoff_reset = devm_reset_control_get_optional_exclusive(dev, "turnoff");
> > @@ -1470,6 +1405,9 @@ static void imx6_pcie_shutdown(struct platform_device *pdev)
> > imx6_pcie_assert_core_reset(imx6_pcie);
> > }
> >
> > +#define IMX6_CLKS_COMMON "pcie_bus", "pcie"
> > +#define IMX6_CLKS_NO_PHYDRV IMX6_CLKS_COMMON, "pcie_phy"
> > +
>
> Just use the clock names directly instead of definitions. It makes the code more
> readable.
>
> Rest LGTM!
>
> - Mani
>
> --
> மணிவண்ணன் சதாசிவம்
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