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PCI: rcar-host: Add support for optional regulators

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The KingFisher board has regulators for miniPCIe, so enable these
optional regulators using devm. devm will automatically disable them
when the driver releases the device. Order variables in reverse-xmas
while we are here.

[kwilczynski: update style to match rest of the code]
Link: https://lore.kernel.org/linux-pci/20231105092908.3792-3-wsa+renesas@sang-engineering.com
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Manivannan Sadhasivam <mani@kernel.org>
This commit is contained in:
Wolfram Sang 2023-11-05 10:29:08 +01:00 committed by Krzysztof Wilczyński
parent b952f96a57
commit 6797e4da2d
No known key found for this signature in database
GPG Key ID: 7C64768D3DE334E7
1 changed files with 17 additions and 1 deletions
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18
drivers/pci/controller/pcie-rcar-host.c
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@ -29,6 +29,7 @@
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include "pcie-rcar.h"
@ -953,14 +954,22 @@ static const struct of_device_id rcar_pcie_of_match[] = {
{},
};
/* Design note 346 from Linear Technology says order is not important. */
static const char * const rcar_pcie_supplies[] = {
"vpcie1v5",
"vpcie3v3",
"vpcie12v",
};
static int rcar_pcie_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct pci_host_bridge *bridge;
struct rcar_pcie_host *host;
struct rcar_pcie *pcie;
unsigned int i;
u32 data;
int err;
struct pci_host_bridge *bridge;
bridge = devm_pci_alloc_host_bridge(dev, sizeof(*host));
if (!bridge)
@ -971,6 +980,13 @@ static int rcar_pcie_probe(struct platform_device *pdev)
pcie->dev = dev;
platform_set_drvdata(pdev, host);
for (i = 0; i < ARRAY_SIZE(rcar_pcie_supplies); i++) {
err = devm_regulator_get_enable_optional(dev, rcar_pcie_supplies[i]);
if (err < 0 && err != -ENODEV)
return dev_err_probe(dev, err, "failed to enable regulator: %s\n",
rcar_pcie_supplies[i]);
}
pm_runtime_enable(pcie->dev);
err = pm_runtime_get_sync(pcie->dev);
if (err < 0) {