linux-kernel - Re: [RFC][PATCH 2/2] reset: qcom-pon: Add support for gen2 pon

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Date:   Fri, 31 May 2019 16:53:02 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     John Stultz <john.stultz@...aro.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Andy Gross <agross@...nel.org>,
        David Brown <david.brown@...aro.org>,
        Amit Pundir <amit.pundir@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Sebastian Reichel <sre@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [RFC][PATCH 2/2] reset: qcom-pon: Add support for gen2 pon

On Fri 31 May 16:47 PDT 2019, John Stultz wrote:

> Add support for gen2 pon register so "reboot bootloader" can
> work on pixel3 and db845.
> 
> Cc: Andy Gross <agross@...nel.org>
> Cc: David Brown <david.brown@...aro.org>
> Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> Cc: Amit Pundir <amit.pundir@...aro.org>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Sebastian Reichel <sre@...nel.org>
> Cc: linux-arm-msm@...r.kernel.org
> Cc: devicetree@...r.kernel.org
> Signed-off-by: John Stultz <john.stultz@...aro.org>
> ---
>  arch/arm64/boot/dts/qcom/pm8998.dtsi |  2 +-
>  drivers/power/reset/qcom-pon.c       | 15 ++++++++++++---
>  2 files changed, 13 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/pm8998.dtsi b/arch/arm64/boot/dts/qcom/pm8998.dtsi
> index d3ca35a940fb..051a52df80f9 100644
> --- a/arch/arm64/boot/dts/qcom/pm8998.dtsi
> +++ b/arch/arm64/boot/dts/qcom/pm8998.dtsi
> @@ -39,7 +39,7 @@
>  		#size-cells = <0>;
>  
>  		pm8998_pon: pon@800 {
> -			compatible = "qcom,pm8916-pon";
> +			compatible = "qcom,pm8998-pon";
>  
>  			reg = <0x800>;
>  			mode-bootloader = <0x2>;

We want to take this through arm-soc and the rest through Sebastian's
tree, so please provide the dts update in a separate commit.

Apart from that this looks good!

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> diff --git a/drivers/power/reset/qcom-pon.c b/drivers/power/reset/qcom-pon.c
> index 3fa1642d4c54..d0336a1612a4 100644
> --- a/drivers/power/reset/qcom-pon.c
> +++ b/drivers/power/reset/qcom-pon.c
> @@ -14,11 +14,15 @@
>  
>  #define PON_SOFT_RB_SPARE		0x8f
>  
> +#define GEN1_REASON_SHIFT		2
> +#define GEN2_REASON_SHIFT		1
> +
>  struct pm8916_pon {
>  	struct device *dev;
>  	struct regmap *regmap;
>  	u32 baseaddr;
>  	struct reboot_mode_driver reboot_mode;
> +	long reason_shift;
>  };
>  
>  static int pm8916_reboot_mode_write(struct reboot_mode_driver *reboot,
> @@ -30,15 +34,18 @@ static int pm8916_reboot_mode_write(struct reboot_mode_driver *reboot,
>  
>  	ret = regmap_update_bits(pon->regmap,
>  				 pon->baseaddr + PON_SOFT_RB_SPARE,
> -				 0xfc, magic << 2);
> +				 0xfc, magic << pon->reason_shift);
>  	if (ret < 0)
>  		dev_err(pon->dev, "update reboot mode bits failed\n");
>  
>  	return ret;
>  }
>  
> +static const struct of_device_id pm8916_pon_id_table[];
> +
>  static int pm8916_pon_probe(struct platform_device *pdev)
>  {
> +	const struct of_device_id *match;
>  	struct pm8916_pon *pon;
>  	int error;
>  
> @@ -60,6 +67,7 @@ static int pm8916_pon_probe(struct platform_device *pdev)
>  		return error;
>  
>  	pon->reboot_mode.dev = &pdev->dev;
> +	pon->reason_shift = of_device_get_match_data(&pdev->dev);
>  	pon->reboot_mode.write = pm8916_reboot_mode_write;
>  	error = devm_reboot_mode_register(&pdev->dev, &pon->reboot_mode);
>  	if (error) {
> @@ -73,8 +81,9 @@ static int pm8916_pon_probe(struct platform_device *pdev)
>  }
>  
>  static const struct of_device_id pm8916_pon_id_table[] = {
> -	{ .compatible = "qcom,pm8916-pon" },
> -	{ .compatible = "qcom,pms405-pon" },
> +	{ .compatible = "qcom,pm8916-pon", .data = (void *)GEN1_REASON_SHIFT },
> +	{ .compatible = "qcom,pms405-pon", .data = (void *)GEN1_REASON_SHIFT },
> +	{ .compatible = "qcom,pm8998-pon", .data = (void *)GEN2_REASON_SHIFT },
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(of, pm8916_pon_id_table);
> -- 
> 2.17.1
>