Linux-ARM-Kernel Archive on lore.kernel.org
 help / color / Atom feed
From: Andrey Smirnov <andrew.smirnov@gmail.com>
To: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: "A.s. Dong" <aisheng.dong@nxp.com>, Rob Herring <robh@kernel.org>,
	Richard Zhu <hongxing.zhu@nxp.com>,
	linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
	Andrey Smirnov <andrew.smirnov@gmail.com>,
	linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
	Fabio Estevam <fabio.estevam@nxp.com>,
	linux-imx@nxp.com, Bjorn Helgaas <bhelgaas@google.com>,
	Leonard Crestez <leonard.crestez@nxp.com>,
	Chris Healy <cphealy@gmail.com>,
	Lucas Stach <l.stach@pengutronix.de>
Subject: [PATCH 2/2] PCI: imx6: Add code to request/control "pcie_aux" clock for i.MX8MQ
Date: Mon, 11 Feb 2019 17:51:08 -0800
Message-ID: <20190212015108.16952-3-andrew.smirnov@gmail.com> (raw)
In-Reply-To: <20190212015108.16952-1-andrew.smirnov@gmail.com>

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
---
 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;
-- 
2.20.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-12  1:51 [PATCH 0/2] " Andrey Smirnov
2019-02-12  1:51 ` [PATCH 1/2] dt-bindings: imx6q-pcie: Add "pcie_aux" clock for imx8mq Andrey Smirnov
2019-02-12  8:57   ` Lucas Stach
2019-02-25 23:39   ` Rob Herring
2019-02-12  1:51 ` Andrey Smirnov [this message]
2019-02-12  9:36   ` [PATCH 2/2] PCI: imx6: Add code to request/control "pcie_aux" clock for i.MX8MQ Lucas Stach
2019-02-28 21:23     ` Trent Piepho
2019-03-01  1:16       ` Andrey Smirnov
2019-02-19 12:42 ` [PATCH 0/2] " Lorenzo Pieralisi
2019-02-19 12:46   ` Lucas Stach

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190212015108.16952-3-andrew.smirnov@gmail.com \
    --to=andrew.smirnov@gmail.com \
    --cc=aisheng.dong@nxp.com \
    --cc=bhelgaas@google.com \
    --cc=cphealy@gmail.com \
    --cc=devicetree@vger.kernel.org \
    --cc=fabio.estevam@nxp.com \
    --cc=hongxing.zhu@nxp.com \
    --cc=l.stach@pengutronix.de \
    --cc=leonard.crestez@nxp.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-imx@nxp.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pci@vger.kernel.org \
    --cc=lorenzo.pieralisi@arm.com \
    --cc=robh@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-ARM-Kernel Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-arm-kernel/0 linux-arm-kernel/git/0.git
	git clone --mirror https://lore.kernel.org/linux-arm-kernel/1 linux-arm-kernel/git/1.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-arm-kernel linux-arm-kernel/ https://lore.kernel.org/linux-arm-kernel \
		linux-arm-kernel@lists.infradead.org infradead-linux-arm-kernel@archiver.kernel.org
	public-inbox-index linux-arm-kernel

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.infradead.lists.linux-arm-kernel


AGPL code for this site: git clone https://public-inbox.org/ public-inbox