linux-kernel - Re: [PATCH v3 RESEND 2/2] PCI: rcar-host: add support for optional regulators

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Message-ID: <20230713153401.GA317502@bhelgaas>
Date:   Thu, 13 Jul 2023 10:34:01 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc:     linux-renesas-soc@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Marek Vasut <marek.vasut+renesas@...il.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 RESEND 2/2] PCI: rcar-host: add support for optional
 regulators

On Wed, Jul 12, 2023 at 12:39:16PM +0200, Wolfram Sang wrote:
> The KingFisher board has regulators. They just need to be en-/disabled,
> so we can leave the handling to devm. Order variables in reverse-xmas
> while we are here.
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

Krzysztof or Lorenzo may fix this up for you, but:
s/add support/Add support/ in subject to match history
and recast commit log to say what the patch *does* ("enable optional
regulators using devm, so devm will automatically disable them when
the driver releases the device"), not *what needs to be done*.

> ---
>  drivers/pci/controller/pcie-rcar-host.c | 16 +++++++++++++++-
>  1 file changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/pcie-rcar-host.c b/drivers/pci/controller/pcie-rcar-host.c
> index 88975e40ee2f..7aecc114af4f 100644
> --- a/drivers/pci/controller/pcie-rcar-host.c
> +++ b/drivers/pci/controller/pcie-rcar-host.c
> @@ -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 +954,20 @@ 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[] = {
> +	"vpcie12v", "vpcie3v3", "vpcie1v5"
> +};
> +
>  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 +978,13 @@ 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, "can't enable regulator %s\n",
> +					     rcar_pcie_supplies[i]);
> +	}
> +
>  	pm_runtime_enable(pcie->dev);
>  	err = pm_runtime_get_sync(pcie->dev);
>  	if (err < 0) {
> -- 
> 2.30.2
>