linux-kernel - Re: [PATCH v2 2/3] can: m_can: m_can_platform: Add support for enabling transceiver

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Date:   Mon, 17 Feb 2020 09:10:47 -0600
From:   Dan Murphy <dmurphy@...com>
To:     Faiz Abbas <faiz_abbas@...com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <netdev@...r.kernel.org>, <linux-can@...r.kernel.org>
CC:     <broonie@...nel.org>, <lgirdwood@...il.com>,
        <catalin.marinas@....com>, <mark.rutland@....com>,
        <robh+dt@...nel.org>, <mkl@...gutronix.de>, <wg@...ndegger.com>,
        <sriram.dash@...sung.com>
Subject: Re: [PATCH v2 2/3] can: m_can: m_can_platform: Add support for
 enabling transceiver

Faiz

On 2/17/20 8:28 AM, Faiz Abbas wrote:
> CAN transceivers on some boards have a standby line which can be
> toggled to enable/disable the transceiver. Model this as an optional
> fixed xceiver regulator.
>
> Signed-off-by: Faiz Abbas <faiz_abbas@...com>
> Acked-by: Sriram Dash <sriram.dash@...sung.com>
> ---
>   drivers/net/can/m_can/m_can_platform.c | 6 ++++++
>   1 file changed, 6 insertions(+)
>
> diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c
> index 38ea5e600fb8..719468fab507 100644
> --- a/drivers/net/can/m_can/m_can_platform.c
> +++ b/drivers/net/can/m_can/m_can_platform.c
> @@ -6,6 +6,7 @@
>   // Copyright (C) 2018-19 Texas Instruments Incorporated - http://www.ti.com/
>   
>   #include <linux/platform_device.h>
> +#include <linux/regulator/consumer.h>
>   
>   #include "m_can.h"
>   
> @@ -57,6 +58,7 @@ static int m_can_plat_probe(struct platform_device *pdev)
>   {
>   	struct m_can_classdev *mcan_class;
>   	struct m_can_plat_priv *priv;
> +	struct regulator *reg_xceiver;
>   	struct resource *res;
>   	void __iomem *addr;
>   	void __iomem *mram_addr;
> @@ -111,6 +113,10 @@ static int m_can_plat_probe(struct platform_device *pdev)
>   
>   	m_can_init_ram(mcan_class);
>   
> +	reg_xceiver = devm_regulator_get_optional(&pdev->dev, "xceiver");
> +	if (PTR_ERR(reg_xceiver) == -EPROBE_DEFER)
> +		return -EPROBE_DEFER;
> +

Where is this regulator enabled?

Shouldn't the regulator be managed by runtime PM as well?

Dan