linux-kernel - Re: [PATCH V8 08/23] mmc: sdhci: add UHS-II module and add a kernel configuration

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Message-ID: <CAK00qKCUtuQBVWmsF4NUv6iyFFdJ4R52iZ4BtmUU3UVB8mJ-+g@mail.gmail.com>
Date:   Fri, 21 Jul 2023 18:11:32 +0800
From:   Victor Shih <victorshihgli@...il.com>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     ulf.hansson@...aro.org, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, benchuanggli@...il.com,
        HL.Liu@...esyslogic.com.tw, Greg.tu@...esyslogic.com.tw,
        takahiro.akashi@...aro.org, dlunev@...omium.org,
        Ben Chuang <ben.chuang@...esyslogic.com.tw>,
        Victor Shih <victor.shih@...esyslogic.com.tw>
Subject: Re: [PATCH V8 08/23] mmc: sdhci: add UHS-II module and add a kernel configuration

On Tue, Jul 11, 2023 at 12:01 AM Adrian Hunter <adrian.hunter@...el.com> wrote:
>
> On 21/06/23 13:01, Victor Shih wrote:
> > From: Victor Shih <victor.shih@...esyslogic.com.tw>
> >
> > This patch adds sdhci-uhs2.c as a module for UHS-II support.
> > This is a skelton for further development in this patch series.
>
> skelton -> skeleton
>

Hi, Adrian

      I will fix it in the V9 version.

Thanks, Victor Shih

> >
> > This kernel configuration, CONFIG_MMC_SDHCI_UHS2, will be used
> > in the following commits to indicate UHS-II specific code in sdhci
> > controllers.
> >
> > Updates in V8:
> >  - Modify MODULE_LICENSE from "GPL v2" to "GPL".
> >
> > Updates in V6:
> >  - Merage V5 of patch[7] and patch[9] in to V6 of patch[8].
> >
> > Signed-off-by: Ben Chuang <ben.chuang@...esyslogic.com.tw>
> > Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
> > Signed-off-by: Victor Shih <victor.shih@...esyslogic.com.tw>
> > ---
> >  drivers/mmc/host/Kconfig      |  9 +++++++
> >  drivers/mmc/host/Makefile     |  1 +
> >  drivers/mmc/host/sdhci-uhs2.c | 46 +++++++++++++++++++++++++++++++++++
> >  3 files changed, 56 insertions(+)
> >  create mode 100644 drivers/mmc/host/sdhci-uhs2.c
> >
> > diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> > index 159a3e9490ae..215f1ab011dd 100644
> > --- a/drivers/mmc/host/Kconfig
> > +++ b/drivers/mmc/host/Kconfig
> > @@ -98,6 +98,15 @@ config MMC_SDHCI_BIG_ENDIAN_32BIT_BYTE_SWAPPER
> >
> >         This is the case for the Nintendo Wii SDHCI.
> >
> > +config MMC_SDHCI_UHS2
> > +     tristate "UHS2 support on SDHCI controller"
> > +     depends on MMC_SDHCI
> > +     help
> > +       This option is selected by SDHCI controller drivers that want to
> > +       support UHS2-capable devices.
> > +
> > +       If you have a controller with this feature, say Y or M here.
> > +
> >  config MMC_SDHCI_PCI
> >       tristate "SDHCI support on PCI bus"
> >       depends on MMC_SDHCI && PCI
> > diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> > index a693fa3d3f1c..799f21d1f81f 100644
> > --- a/drivers/mmc/host/Makefile
> > +++ b/drivers/mmc/host/Makefile
> > @@ -11,6 +11,7 @@ obj-$(CONFIG_MMC_PXA)               += pxamci.o
> >  obj-$(CONFIG_MMC_MXC)                += mxcmmc.o
> >  obj-$(CONFIG_MMC_MXS)                += mxs-mmc.o
> >  obj-$(CONFIG_MMC_SDHCI)              += sdhci.o
> > +obj-$(CONFIG_MMC_SDHCI_UHS2) += sdhci-uhs2.o
> >  obj-$(CONFIG_MMC_SDHCI_PCI)  += sdhci-pci.o
> >  sdhci-pci-y                  += sdhci-pci-core.o sdhci-pci-o2micro.o sdhci-pci-arasan.o \
> >                                  sdhci-pci-dwc-mshc.o sdhci-pci-gli.o
> > diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
> > new file mode 100644
> > index 000000000000..608f8ad5aaed
> > --- /dev/null
> > +++ b/drivers/mmc/host/sdhci-uhs2.c
> > @@ -0,0 +1,46 @@
> > +// SPDX-License-Identifier: GPL-2.0-or-later
> > +/*
> > + *  linux/drivers/mmc/host/sdhci_uhs2.c - Secure Digital Host Controller
> > + *  Interface driver
> > + *
> > + *  Copyright (C) 2014 Intel Corp, All Rights Reserved.
> > + *  Copyright (C) 2020 Genesys Logic, Inc.
> > + *  Authors: Ben Chuang <ben.chuang@...esyslogic.com.tw>
> > + *  Copyright (C) 2020 Linaro Limited
> > + *  Author: AKASHI Takahiro <takahiro.akashi@...aro.org>
> > + */
> > +
> > +#include <linux/module.h>
> > +
> > +#include "sdhci.h"
> > +#include "sdhci-uhs2.h"
> > +
> > +#define DRIVER_NAME "sdhci_uhs2"
> > +#define DBG(f, x...) \
> > +     pr_debug(DRIVER_NAME " [%s()]: " f, __func__, ## x)
> > +
> > +/*****************************************************************************\
> > + *                                                                           *
> > + * Driver init/exit                                                          *
> > + *                                                                           *
> > +\*****************************************************************************/
> > +
> > +static int sdhci_uhs2_host_ops_init(struct sdhci_host *host)
> > +{
> > +     return 0;
> > +}
> > +
> > +static int __init sdhci_uhs2_mod_init(void)
> > +{
> > +     return 0;
> > +}
> > +module_init(sdhci_uhs2_mod_init);
> > +
> > +static void __exit sdhci_uhs2_mod_exit(void)
> > +{
> > +}
> > +module_exit(sdhci_uhs2_mod_exit);
> > +
> > +MODULE_AUTHOR("Intel, Genesys Logic, Linaro");
> > +MODULE_DESCRIPTION("MMC UHS-II Support");
> > +MODULE_LICENSE("GPL");
>