Messages in this thread | | | Subject | Re: [PATCH 2/2] PCI: imx6: Add code to request/control "pcie_aux" clock for i.MX8MQ | From | Lucas Stach <> | Date | Tue, 12 Feb 2019 10:36:06 +0100 |
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Am Montag, den 11.02.2019, 17:51 -0800 schrieb Andrey Smirnov: > PCIe IP block has additional clock, "pcie_aux", that needs to be > controlled by the driver. Add code to support that. > > Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> > Cc: Bjorn Helgaas <bhelgaas@google.com> > Cc: Fabio Estevam <fabio.estevam@nxp.com> > Cc: Chris Healy <cphealy@gmail.com> > Cc: Lucas Stach <l.stach@pengutronix.de> > Cc: Leonard Crestez <leonard.crestez@nxp.com> > Cc: "A.s. Dong" <aisheng.dong@nxp.com> > Cc: Richard Zhu <hongxing.zhu@nxp.com> > Cc: linux-imx@nxp.com > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-kernel@vger.kernel.org > Cc: linux-pci@vger.kernel.org > Cc: Rob Herring <robh@kernel.org> > Cc: devicetree@vger.kernel.org
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
> --- > drivers/pci/controller/dwc/pci-imx6.c | 16 ++++++++++++++++ > 1 file changed, 16 insertions(+) > > diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c > index 7cdf8f9ab244..1a7031782846 100644 > --- a/drivers/pci/controller/dwc/pci-imx6.c > +++ b/drivers/pci/controller/dwc/pci-imx6.c > @@ -65,6 +65,7 @@ struct imx6_pcie { > struct clk *pcie_phy; > struct clk *pcie_inbound_axi; > struct clk *pcie; > + struct clk *pcie_aux; > struct regmap *iomuxc_gpr; > u32 controller_id; > struct reset_control *pciephy_reset; > @@ -421,6 +422,12 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie) > case IMX7D: > break; > case IMX8MQ: > + ret = clk_prepare_enable(imx6_pcie->pcie_aux); > + if (ret) { > + dev_err(dev, "unable to enable pcie_aux clock\n"); > + break; > + } > + > offset = imx6_pcie_grp_offset(imx6_pcie); > /* > * Set the over ride low and enabled > @@ -904,6 +911,9 @@ static void imx6_pcie_clk_disable(struct imx6_pcie *imx6_pcie) > IMX7D_GPR12_PCIE_PHY_REFCLK_SEL, > IMX7D_GPR12_PCIE_PHY_REFCLK_SEL); > break; > + case IMX8MQ: > + clk_disable_unprepare(imx6_pcie->pcie_aux); > + break; > default: > break; > } > @@ -1049,6 +1059,12 @@ static int imx6_pcie_probe(struct platform_device *pdev) > dev_err(dev, "Failed to get PCIE APPS reset control\n"); > return PTR_ERR(imx6_pcie->apps_reset); > } > + > + imx6_pcie->pcie_aux = devm_clk_get(dev, "pcie_aux"); > + if (IS_ERR(imx6_pcie->pcie_aux)) { > + dev_err(dev, "pcie_aux clock source missing or invalid\n"); > + return PTR_ERR(imx6_pcie->pcie_aux); > + } > break; > default: > break;
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