linux-kernel - Re: [PATCH] Revert "usb: host: ehci-msm: Use devm_ioremap_resource instead of devm

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Date:	Tue, 21 Apr 2015 16:46:03 +0530
From:	Vivek Gautam <gautam.vivek@...sung.com>
To:	"Ivan T. Ivanov" <ivan.ivanov@...aro.org>,
	Alan Stern <stern@...land.harvard.edu>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] Revert
 "usb: host: ehci-msm: Use devm_ioremap_resource instead of devm_ioremap"

Hi,

On Tuesday, April 21, 2015 12:41 PM "Ivan T. Ivanov"
<ivan.ivanov@...aro.org> wrote:
> This reverts commit 70843f623b58 ("usb: host: ehci-msm: Use
> devm_ioremap_resource instead of devm_ioremap"), because msm_otg
> and this driver are using same address space to access AHB mode
> and USB command registers.
>
> Cc: Vivek Gautam <gautam.vivek@...sung.com>

Since ehci-msm and msm_otg both want to control few USB registers,
it makes sense to request ioremap'ed region in both drivers.

Acked-by: Vivek Gautam <gautam.vivek@...sung.com>

I can see a patch in mailing list for adding both ehci-host and otg on msm 
[1].
But I think it has not yet made it to mainline kernel.

[1] [v3,04/11] ARM: dts: apq8064: Add USB OTG support
https://patches.linaro.org/47067/

> Signed-off-by: Ivan T. Ivanov <ivan.ivanov@...aro.org>
> ---
> drivers/usb/host/ehci-msm.c | 13 ++++++++++---
> 1 file changed, 10 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/usb/host/ehci-msm.c b/drivers/usb/host/ehci-msm.c
> index 9db74ca..275c92e 100644
> --- a/drivers/usb/host/ehci-msm.c
> +++ b/drivers/usb/host/ehci-msm.c
> @@ -88,13 +88,20 @@ static int ehci_msm_probe(struct platform_device
> *pdev)
>  }
>
>  res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> - hcd->regs = devm_ioremap_resource(&pdev->dev, res);
> - if (IS_ERR(hcd->regs)) {
> - ret = PTR_ERR(hcd->regs);
> + if (!res) {
> + dev_err(&pdev->dev, "Unable to get memory resource\n");
> + ret = -ENODEV;
>  goto put_hcd;
>  }
> +
>  hcd->rsrc_start = res->start;
>  hcd->rsrc_len = resource_size(res);
> + hcd->regs = devm_ioremap(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len);
> + if (!hcd->regs) {
> + dev_err(&pdev->dev, "ioremap failed\n");
> + ret = -ENOMEM;
> + goto put_hcd;
> + }
>
>  /*
>  * OTG driver takes care of PHY initialization, clock management,
> --
> 1.9.1
> 
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