linux-omap.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Kishon Vijay Abraham I <kishon@ti.com>
To: Kishon Vijay Abraham I <kishon@ti.com>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Rob Herring <robh+dt@kernel.org>,
	Tom Joseph <tjoseph@cadence.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Nadeem Athani <nadeem@cadence.com>
Cc: <linux-pci@vger.kernel.org>, <devicetree@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, <linux-omap@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	Lokesh Vutla <lokeshvutla@ti.com>
Subject: [PATCH v4 4/4] PCI: j721e: Add support to provide refclk to PCIe connector
Date: Mon, 8 Mar 2021 12:05:50 +0530	[thread overview]
Message-ID: <20210308063550.6227-5-kishon@ti.com> (raw)
In-Reply-To: <20210308063550.6227-1-kishon@ti.com>

Add support to provide refclk to PCIe connector.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 drivers/pci/controller/cadence/pci-j721e.c | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c
index dac1ac8a7615..7f9dd34b98a9 100644
--- a/drivers/pci/controller/cadence/pci-j721e.c
+++ b/drivers/pci/controller/cadence/pci-j721e.c
@@ -6,6 +6,7 @@
  * Author: Kishon Vijay Abraham I <kishon@ti.com>
  */
 
+#include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/gpio/consumer.h>
 #include <linux/io.h>
@@ -50,6 +51,7 @@ enum link_status {
 
 struct j721e_pcie {
 	struct device		*dev;
+	struct clk		*refclk;
 	u32			mode;
 	u32			num_lanes;
 	struct cdns_pcie	*cdns_pcie;
@@ -310,6 +312,7 @@ static int j721e_pcie_probe(struct platform_device *pdev)
 	struct cdns_pcie_ep *ep;
 	struct gpio_desc *gpiod;
 	void __iomem *base;
+	struct clk *clk;
 	u32 num_lanes;
 	u32 mode;
 	int ret;
@@ -408,6 +411,20 @@ static int j721e_pcie_probe(struct platform_device *pdev)
 			goto err_get_sync;
 		}
 
+		clk = devm_clk_get_optional(dev, "pcie_refclk");
+		if (IS_ERR(clk)) {
+			ret = PTR_ERR(clk);
+			dev_err(dev, "failed to get pcie_refclk\n");
+			goto err_pcie_setup;
+		}
+
+		ret = clk_prepare_enable(clk);
+		if (ret) {
+			dev_err(dev, "failed to enable pcie_refclk\n");
+			goto err_get_sync;
+		}
+		pcie->refclk = clk;
+
 		/*
 		 * "Power Sequencing and Reset Signal Timings" table in
 		 * PCI EXPRESS CARD ELECTROMECHANICAL SPECIFICATION, REV. 3.0
@@ -422,8 +439,10 @@ static int j721e_pcie_probe(struct platform_device *pdev)
 		}
 
 		ret = cdns_pcie_host_setup(rc);
-		if (ret < 0)
+		if (ret < 0) {
+			clk_disable_unprepare(pcie->refclk);
 			goto err_pcie_setup;
+		}
 
 		break;
 	case PCI_MODE_EP:
@@ -476,6 +495,7 @@ static int j721e_pcie_remove(struct platform_device *pdev)
 	struct cdns_pcie *cdns_pcie = pcie->cdns_pcie;
 	struct device *dev = &pdev->dev;
 
+	clk_disable_unprepare(pcie->refclk);
 	cdns_pcie_disable_phy(cdns_pcie);
 	pm_runtime_put(dev);
 	pm_runtime_disable(dev);
-- 
2.17.1


  parent reply	other threads:[~2021-03-08  6:37 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-08  6:35 [PATCH v4 0/4] AM64: Add PCIe bindings and driver support Kishon Vijay Abraham I
2021-03-08  6:35 ` [PATCH v4 1/4] dt-bindings: PCI: ti,j721e: Add binding to represent refclk to the connector Kishon Vijay Abraham I
2021-03-10  2:34   ` [PATCH v4 1/4] dt-bindings: PCI: ti, j721e: " Rob Herring
2021-03-08  6:35 ` [PATCH v4 2/4] dt-bindings: PCI: ti,j721e: Add host mode dt-bindings for TI's AM64 SoC Kishon Vijay Abraham I
2021-03-08  6:35 ` [PATCH v4 3/4] dt-bindings: PCI: ti,j721e: Add endpoint " Kishon Vijay Abraham I
2021-03-08  6:35 ` Kishon Vijay Abraham I [this message]
2021-03-23 10:35 ` [PATCH v4 0/4] AM64: Add PCIe bindings and driver support Lorenzo Pieralisi

Reply instructions:

You may reply publicly 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=20210308063550.6227-5-kishon@ti.com \
    --to=kishon@ti.com \
    --cc=bhelgaas@google.com \
    --cc=devicetree@vger.kernel.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-omap@vger.kernel.org \
    --cc=linux-pci@vger.kernel.org \
    --cc=lokeshvutla@ti.com \
    --cc=lorenzo.pieralisi@arm.com \
    --cc=nadeem@cadence.com \
    --cc=robh+dt@kernel.org \
    --cc=tjoseph@cadence.com \
    --subject='Re: [PATCH v4 4/4] PCI: j721e: Add support to provide refclk to PCIe connector' \
    /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

This is a public inbox, see mirroring instructions
on how to clone and mirror all data and code used for this inbox