From: "Marek Behún" <kabel@kernel.org>
To: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: "Bjorn Helgaas" <helgaas@kernel.org>,
"Gregory CLEMENT" <gregory.clement@bootlin.com>,
pali@kernel.org, "Krzysztof Wilczyński" <kw@linux.com>,
linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
"Miquel Raynal" <miquel.raynal@bootlin.com>,
"Marek Behún" <kabel@kernel.org>
Subject: [PATCH v2 05/10] PCI: aardvark: Add clock support
Date: Tue, 27 Sep 2022 16:19:21 +0200 [thread overview]
Message-ID: <20220927141926.8895-6-kabel@kernel.org> (raw)
In-Reply-To: <20220927141926.8895-1-kabel@kernel.org>
From: Miquel Raynal <miquel.raynal@bootlin.com>
The IP relies on a gated clock. When we will add S2RAM support, this
clock will need to be resumed before any PCIe registers are
accessed. Add support for this clock.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Marek Behún <kabel@kernel.org>
---
drivers/pci/controller/pci-aardvark.c | 32 +++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
index 03e318bc171f..3beafc893969 100644
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -9,6 +9,7 @@
*/
#include <linux/bitfield.h>
+#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/interrupt.h>
@@ -297,6 +298,7 @@ struct advk_pcie {
struct timer_list link_irq_timer;
struct pci_bridge_emul bridge;
struct gpio_desc *reset_gpio;
+ struct clk *clk;
struct phy *phy;
};
@@ -1809,6 +1811,29 @@ static int advk_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
return of_irq_parse_and_map_pci(dev, slot, pin);
}
+static int advk_pcie_setup_clk(struct advk_pcie *pcie)
+{
+ struct device *dev = &pcie->pdev->dev;
+ int ret;
+
+ pcie->clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(pcie->clk) && (PTR_ERR(pcie->clk) == -EPROBE_DEFER))
+ return PTR_ERR(pcie->clk);
+
+ /* Old bindings miss the clock handle */
+ if (IS_ERR(pcie->clk)) {
+ dev_warn(dev, "Clock unavailable (%ld)\n", PTR_ERR(pcie->clk));
+ pcie->clk = NULL;
+ return 0;
+ }
+
+ ret = clk_prepare_enable(pcie->clk);
+ if (ret)
+ dev_err(dev, "Clock initialization failed (%d)\n", ret);
+
+ return ret;
+}
+
static void advk_pcie_disable_phy(struct advk_pcie *pcie)
{
phy_power_off(pcie->phy);
@@ -2000,6 +2025,10 @@ static int advk_pcie_probe(struct platform_device *pdev)
slot_power_limit / 1000,
(slot_power_limit / 100) % 10);
+ ret = advk_pcie_setup_clk(pcie);
+ if (ret)
+ return ret;
+
ret = advk_pcie_setup_phy(pcie);
if (ret)
return ret;
@@ -2122,6 +2151,9 @@ static int advk_pcie_remove(struct platform_device *pdev)
/* Disable phy */
advk_pcie_disable_phy(pcie);
+ /* Disable clock */
+ clk_disable_unprepare(pcie->clk);
+
return 0;
}
--
2.35.1
next prev parent reply other threads:[~2022-09-27 14:20 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-27 14:19 [PATCH v2 00/10] PCI: aardvark controller changes BATCH 6 Marek Behún
2022-09-27 14:19 ` [PATCH v2 01/10] PCI: pciehp: Enable Command Completed Interrupt only if supported Marek Behún
2022-12-07 14:29 ` Bjorn Helgaas
2022-09-27 14:19 ` [PATCH v2 02/10] PCI: aardvark: Add support for DLLSC and hotplug interrupt Marek Behún
2022-09-27 14:19 ` [PATCH v2 03/10] PCI: aardvark: Send Set_Slot_Power_Limit message Marek Behún
2022-09-27 14:19 ` [PATCH v2 04/10] arm64: dts: armada-3720-turris-mox: Define slot-power-limit-milliwatt for PCIe Marek Behún
2022-11-27 23:36 ` Gregory CLEMENT
2022-09-27 14:19 ` Marek Behún [this message]
2022-09-27 14:19 ` [PATCH v2 06/10] PCI: aardvark: Add suspend to RAM support Marek Behún
2022-09-27 14:19 ` [PATCH v2 07/10] PCI: aardvark: Replace custom PCIE_CORE_ERR_CAPCTL_* macros by linux/pci_regs.h macros Marek Behún
2022-09-27 14:19 ` [PATCH v2 08/10] PCI: aardvark: Don't write read-only bits explicitly in PCI_ERR_CAP register Marek Behún
2022-09-27 14:19 ` [PATCH v2 09/10] PCI: aardvark: Explicitly disable Marvell strict ordering Marek Behún
2022-09-27 14:19 ` [PATCH v2 10/10] PCI: aardvark: Cleanup some register macros Marek Behún
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=20220927141926.8895-6-kabel@kernel.org \
--to=kabel@kernel.org \
--cc=gregory.clement@bootlin.com \
--cc=helgaas@kernel.org \
--cc=kw@linux.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-pci@vger.kernel.org \
--cc=lorenzo.pieralisi@arm.com \
--cc=miquel.raynal@bootlin.com \
--cc=pali@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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).