linux-kernel - Re: [PATCH v2] usb: host: xhci-mtk: Simplify supplies handling with regulator

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Message-ID: <d072b376ef5eb5d14cbcf35e342dd359d532bd23.camel@mediatek.com>
Date:   Mon, 28 Feb 2022 16:19:00 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
CC:     <mathias.nyman@...el.com>, <gregkh@...uxfoundation.org>,
        <matthias.bgg@...il.com>, <linux-usb@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <kernel@...labora.com>
Subject: Re: [PATCH v2] usb: host: xhci-mtk: Simplify supplies handling with
 regulator_bulk

On Mon, 2022-02-14 at 12:19 +0100, AngeloGioacchino Del Regno wrote:
> Remove the custom functions xhci_mtk_ldos_{enable,disable}() by
> switching to using regulator_bulk to perform the very same thing,
> as the regulators are always either both enabled or both disabled.
> 
> Signed-off-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@...labora.com>
> ---
> 
> v2: Change dynamic vregs array to static definition with new
> xhci_mtk_vregs_get()
>     helper as requested by Chunfeng
> 
>  drivers/usb/host/xhci-mtk.c | 44 ++++++++++-------------------------
> --
>  drivers/usb/host/xhci-mtk.h |  5 +++--
>  2 files changed, 14 insertions(+), 35 deletions(-)
> 
> diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-
> mtk.c
> index e25bad0894cf..b89b4f159a4d 100644
> --- a/drivers/usb/host/xhci-mtk.c
> +++ b/drivers/usb/host/xhci-mtk.c
> @@ -401,29 +401,14 @@ static int xhci_mtk_clks_get(struct
> xhci_hcd_mtk *mtk)
>  	return devm_clk_bulk_get_optional(mtk->dev, BULK_CLKS_NUM,
> clks);
>  }
>  
> -static int xhci_mtk_ldos_enable(struct xhci_hcd_mtk *mtk)
> +static int xhci_mtk_vregs_get(struct xhci_hcd_mtk *mtk)
>  {
> -	int ret;
> +	struct regulator_bulk_data *supplies = mtk->supplies;
>  
> -	ret = regulator_enable(mtk->vbus);
> -	if (ret) {
> -		dev_err(mtk->dev, "failed to enable vbus\n");
> -		return ret;
> -	}
> -
> -	ret = regulator_enable(mtk->vusb33);
> -	if (ret) {
> -		dev_err(mtk->dev, "failed to enable vusb33\n");
> -		regulator_disable(mtk->vbus);
> -		return ret;
> -	}
> -	return 0;
> -}
> +	supplies[0].supply = "vbus";
> +	supplies[1].supply = "vusb33";
>  
> -static void xhci_mtk_ldos_disable(struct xhci_hcd_mtk *mtk)
> -{
> -	regulator_disable(mtk->vbus);
> -	regulator_disable(mtk->vusb33);
> +	return devm_regulator_bulk_get(mtk->dev, BULK_VREGS_NUM,
> supplies);
>  }
>  
>  static void xhci_mtk_quirks(struct device *dev, struct xhci_hcd
> *xhci)
> @@ -513,17 +498,10 @@ static int xhci_mtk_probe(struct
> platform_device *pdev)
>  		return -ENOMEM;
>  
>  	mtk->dev = dev;
> -	mtk->vbus = devm_regulator_get(dev, "vbus");
> -	if (IS_ERR(mtk->vbus)) {
> -		dev_err(dev, "fail to get vbus\n");
> -		return PTR_ERR(mtk->vbus);
> -	}
>  
> -	mtk->vusb33 = devm_regulator_get(dev, "vusb33");
> -	if (IS_ERR(mtk->vusb33)) {
> -		dev_err(dev, "fail to get vusb33\n");
> -		return PTR_ERR(mtk->vusb33);
> -	}
> +	ret = xhci_mtk_vregs_get(mtk);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to get
> regulators\n");
>  
>  	ret = xhci_mtk_clks_get(mtk);
>  	if (ret)
> @@ -564,7 +542,7 @@ static int xhci_mtk_probe(struct platform_device
> *pdev)
>  	pm_runtime_enable(dev);
>  	pm_runtime_get_sync(dev);
>  
> -	ret = xhci_mtk_ldos_enable(mtk);
> +	ret = regulator_bulk_enable(BULK_VREGS_NUM, mtk->supplies);
>  	if (ret)
>  		goto disable_pm;
>  
> @@ -673,7 +651,7 @@ static int xhci_mtk_probe(struct platform_device
> *pdev)
>  	clk_bulk_disable_unprepare(BULK_CLKS_NUM, mtk->clks);
>  
>  disable_ldos:
> -	xhci_mtk_ldos_disable(mtk);
> +	regulator_bulk_disable(BULK_VREGS_NUM, mtk->supplies);
>  
>  disable_pm:
>  	pm_runtime_put_noidle(dev);
> @@ -701,7 +679,7 @@ static int xhci_mtk_remove(struct platform_device
> *pdev)
>  	usb_put_hcd(hcd);
>  	xhci_mtk_sch_exit(mtk);
>  	clk_bulk_disable_unprepare(BULK_CLKS_NUM, mtk->clks);
> -	xhci_mtk_ldos_disable(mtk);
> +	regulator_bulk_disable(BULK_VREGS_NUM, mtk->supplies);
>  
>  	pm_runtime_disable(dev);
>  	pm_runtime_put_noidle(dev);
> diff --git a/drivers/usb/host/xhci-mtk.h b/drivers/usb/host/xhci-
> mtk.h
> index 4b1ea89f959a..ffd4b493b4ba 100644
> --- a/drivers/usb/host/xhci-mtk.h
> +++ b/drivers/usb/host/xhci-mtk.h
> @@ -11,10 +11,12 @@
>  
>  #include <linux/clk.h>
>  #include <linux/hashtable.h>
> +#include <linux/regulator/consumer.h>
>  
>  #include "xhci.h"
>  
>  #define BULK_CLKS_NUM	5
> +#define BULK_VREGS_NUM	2
>  
>  /* support at most 64 ep, use 32 size hash table */
>  #define SCH_EP_HASH_BITS	5
> @@ -150,9 +152,8 @@ struct xhci_hcd_mtk {
>  	int num_u3_ports;
>  	int u2p_dis_msk;
>  	int u3p_dis_msk;
> -	struct regulator *vusb33;
> -	struct regulator *vbus;
>  	struct clk_bulk_data clks[BULK_CLKS_NUM];
> +	struct regulator_bulk_data supplies[BULK_VREGS_NUM];
>  	unsigned int has_ippc:1;
>  	unsigned int lpm_support:1;
>  	unsigned int u2_lpm_disable:1;

Acked-by: Chunfeng Yun <chunfeng.yun@...iatek.com>

Thanks a lot