linux-kernel - Re: [PATCH v3] usb: dwc3: OCTEON: add support for device tree

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Date:   Mon, 12 Sep 2016 09:58:08 +0300
From:   Felipe Balbi <felipe.balbi@...ux.intel.com>
To:     "Steven J. Hill" <Steven.Hill@...ium.com>,
        linux-usb@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
        David Daney <david.daney@...ium.com>
Subject: Re: [PATCH v3] usb: dwc3: OCTEON: add support for device tree

"Steven J. Hill" <Steven.Hill@...ium.com> writes:

> This patch adds support to parse probe data for
> the dwc3-octeon driver using device tree. The
> DWC3 IP core is found on OCTEON III processors.
>
> Signed-off-by: Steven J. Hill <Steven.Hill@...ium.com>
>
> Changes in v3:
> - Massive simplification of glue logic. Almost all the
>   work is done in the SoC platform code.
> Changes in v2:
> - Changed comment block to acurately describe why the DMA
>   properties are being set.
> - Deleted 'dwc3_octeon_remove()' function as it serves
>   no purpose. Also changed driver from tristate to a
>   boolen as we have no plans to make it modular.
> - Changed driver dependency from CAVIUM_OCTEON_SOC to
>   CPU_CAVIUM_OCTEON || COMPILE_TEST per Balbi's request.

Thanks for updating this changelog, but next time it should come after
the tearline (---) below. We don't want this to reach git's history :-)

> ---
>  drivers/usb/dwc3/Kconfig       | 10 +++++++
>  drivers/usb/dwc3/Makefile      |  1 +
>  drivers/usb/dwc3/dwc3-octeon.c | 61 ++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 72 insertions(+)
>  create mode 100644 drivers/usb/dwc3/dwc3-octeon.c
>
> diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
> index a64ce1c..f2cb24b 100644
> --- a/drivers/usb/dwc3/Kconfig
> +++ b/drivers/usb/dwc3/Kconfig
> @@ -105,4 +105,14 @@ config USB_DWC3_ST
>  	  inside (i.e. STiH407).
>  	  Say 'Y' or 'M' if you have one such device.
>
> +config USB_DWC3_OCTEON
> +	bool "Cavium OCTEON III Platforms"
> +	depends on CPU_CAVIUM_OCTEON || COMPILE_TEST
> +	depends on OF
> +	default USB_DWC3
> +	help
> +	  Cavium OCTEON III SoCs with one DesignWare Core USB3 IP
> +	  inside (i.e. cn71xx and cn78xx).
> +	  Say 'Y' or 'M' if you have one such device.
> +
>  endif
> diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile
> index 22420e1..f1a7a3e 100644
> --- a/drivers/usb/dwc3/Makefile
> +++ b/drivers/usb/dwc3/Makefile
> @@ -39,3 +39,4 @@ obj-$(CONFIG_USB_DWC3_PCI)		+= dwc3-pci.o
>  obj-$(CONFIG_USB_DWC3_KEYSTONE)		+= dwc3-keystone.o
>  obj-$(CONFIG_USB_DWC3_OF_SIMPLE)	+= dwc3-of-simple.o
>  obj-$(CONFIG_USB_DWC3_ST)		+= dwc3-st.o
> +obj-$(CONFIG_USB_DWC3_OCTEON)		+= dwc3-octeon.o
> diff --git a/drivers/usb/dwc3/dwc3-octeon.c b/drivers/usb/dwc3/dwc3-octeon.c
> new file mode 100644
> index 0000000..ae84a01
> --- /dev/null
> +++ b/drivers/usb/dwc3/dwc3-octeon.c
> @@ -0,0 +1,61 @@
> +/**
> + * dwc3-octeon.c - Cavium OCTEON III DWC3 Specific Glue Layer
> + *
> + * Copyright (C) 2016 Cavium Networks
> + *
> + * Author: Steven J. Hill <steven.hill@...ium.com>
> + *
> + * This program is free software: you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2  of
> + * the License as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * Inspired by dwc3-exynos.c and dwc3-st.c files.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/device.h>
> +#include <linux/platform_device.h>
> +#include <linux/of.h>
> +#include <linux/dma-mapping.h>
> +
> +static int dwc3_octeon_probe(struct platform_device *pdev)
> +{
> +	struct device		*dev = &pdev->dev;
> +	int			ret;
> +
> +	/*
> +	 * Right now device-tree probed devices do not provide
> +	 * "dma-ranges" or "dma-coherent" properties.
> +	 */
> +	ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64));
> +	if (ret)
> +		return ret;

don't you need to call of_platform_populate() at least?

-- 
balbi

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