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Message-ID: <CAP6Zq1iokM2chLjGiRmFxe3w2vUUKQ0acd6V9z=7AmDZMSViQw@mail.gmail.com>
Date: Sun, 4 Dec 2022 13:21:14 +0200
From: Tomer Maimon <tmaimon77@...il.com>
To: Adrian Hunter <adrian.hunter@...el.com>
Cc: ulf.hansson@...aro.org, avifishman70@...il.com,
tali.perry1@...il.com, joel@....id.au, venture@...gle.com,
yuenn@...gle.com, benjaminfair@...gle.com,
skhan@...uxfoundation.org, davidgow@...gle.com,
pbrobinson@...il.com, gsomlo@...il.com, briannorris@...omium.org,
arnd@...db.de, krakoczy@...micro.com, andy.shevchenko@...il.com,
openbmc@...ts.ozlabs.org, linux-mmc@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/2] mmc: sdhci-npcm: Add NPCM SDHCI driver
Hi Adrian,
Thanks for your comments.
Your comments will be addressed next version.
On Thu, 1 Dec 2022 at 18:28, Adrian Hunter <adrian.hunter@...el.com> wrote:
>
> On 30/11/22 17:08, Tomer Maimon wrote:
> > Add Nuvoton NPCM BMC sdhci-pltfm controller driver.
> >
> > Signed-off-by: Tomer Maimon <tmaimon77@...il.com>
> > ---
> > drivers/mmc/host/Kconfig | 8 ++++
> > drivers/mmc/host/Makefile | 1 +
> > drivers/mmc/host/sdhci-npcm.c | 81 +++++++++++++++++++++++++++++++++++
> > 3 files changed, 90 insertions(+)
> > create mode 100644 drivers/mmc/host/sdhci-npcm.c
> >
> > diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> > index fb1062a6394c..4b2d9ce4308c 100644
> > --- a/drivers/mmc/host/Kconfig
> > +++ b/drivers/mmc/host/Kconfig
> > @@ -709,6 +709,14 @@ config MMC_TMIO
> > This provides support for the SD/MMC cell found in TC6393XB,
> > T7L66XB and also HTC ASIC3
> >
> > +config MMC_SDHCI_NPCM
> > + tristate "Secure Digital Host Controller Interface support for NPCM"
> > + depends on ARCH_NPCM || COMPILE_TEST
> > + depends on MMC_SDHCI_PLTFM
> > + help
> > + This provides support for the SD/eMMC controller found in
> > + NPCM BMC family SoCs.
> > +
> > config MMC_SDHI
> > tristate "Renesas SDHI SD/SDIO controller support"
> > depends on SUPERH || ARCH_RENESAS || COMPILE_TEST
> > diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> > index 4e4ceb32c4b4..801086613d7f 100644
> > --- a/drivers/mmc/host/Makefile
> > +++ b/drivers/mmc/host/Makefile
> > @@ -37,6 +37,7 @@ obj-$(CONFIG_MMC_SPI) += of_mmc_spi.o
> > obj-$(CONFIG_MMC_S3C) += s3cmci.o
> > obj-$(CONFIG_MMC_SDRICOH_CS) += sdricoh_cs.o
> > obj-$(CONFIG_MMC_TMIO) += tmio_mmc.o
> > +obj-$(CONFIG_MMC_SDHCI_NPCM) += sdhci-npcm.o
> > obj-$(CONFIG_MMC_TMIO_CORE) += tmio_mmc_core.o
> > obj-$(CONFIG_MMC_SDHI) += renesas_sdhi_core.o
> > obj-$(CONFIG_MMC_SDHI_SYS_DMAC) += renesas_sdhi_sys_dmac.o
> > diff --git a/drivers/mmc/host/sdhci-npcm.c b/drivers/mmc/host/sdhci-npcm.c
> > new file mode 100644
> > index 000000000000..298c5f3e7c2b
> > --- /dev/null
> > +++ b/drivers/mmc/host/sdhci-npcm.c
> > @@ -0,0 +1,81 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * NPCM SDHC MMC host controller driver.
> > + *
> > + */
> > +
> > +#include <linux/clk.h>
> > +#include <linux/err.h>
> > +#include <linux/io.h>
> > +#include <linux/mmc/host.h>
> > +#include <linux/mmc/mmc.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +
> > +#include "sdhci-pltfm.h"
> > +
> > +static const struct sdhci_pltfm_data npcm_sdhci_pdata = {
> > + .quirks = SDHCI_QUIRK_DELAY_AFTER_POWER,
> > + .quirks2 = SDHCI_QUIRK2_STOP_WITH_TC |
> > + SDHCI_QUIRK2_NO_1_8_V,
> > +};
> > +
> > +static int npcm_sdhci_probe(struct platform_device *pdev)
> > +{
> > + struct sdhci_pltfm_host *pltfm_host;
> > + struct sdhci_host *host;
> > + u32 caps;
> > + int ret;
> > +
> > + host = sdhci_pltfm_init(pdev, &npcm_sdhci_pdata, 0);
> > + if (IS_ERR(host))
> > + return PTR_ERR(host);
> > +
> > + pltfm_host = sdhci_priv(host);
> > + pltfm_host->clk = devm_clk_get(&pdev->dev, NULL);
>
> For an optional clock, something like:
>
> pltfm_host->clk = devm_clk_get_optional(&pdev->dev, NULL);
> if (IS_ERR(pltfm_host->clk))
> return PTR_ERR(pltfm_host->clk);
>
> will handle -EPROBE_DEFER
>
> > +
> > + if (!IS_ERR(pltfm_host->clk))
> > + clk_prepare_enable(pltfm_host->clk);
> > +
> > + caps = sdhci_readl(host, SDHCI_CAPABILITIES);
> > + if (caps & SDHCI_CAN_DO_8BIT)
> > + host->mmc->caps |= MMC_CAP_8_BIT_DATA;
> > +
> > + ret = mmc_of_parse(host->mmc);
> > + if (ret)
> > + goto err_sdhci_add;
> > +
> > + ret = sdhci_add_host(host);
> > + if (ret)
> > + goto err_sdhci_add;
> > +
> > + return 0;
> > +
> > +err_sdhci_add:
> > + clk_disable_unprepare(pltfm_host->clk);
> > + sdhci_pltfm_free(pdev);
> > + return ret;
> > +}
> > +
> > +static const struct of_device_id npcm_sdhci_of_match[] = {
> > + { .compatible = "nuvoton,npcm750-sdhci" },
> > + { .compatible = "nuvoton,npcm845-sdhci" },
> > + { }
> > +};
> > +MODULE_DEVICE_TABLE(of, npcm_sdhci_of_match);
> > +
> > +static struct platform_driver npcm_sdhci_driver = {
> > + .driver = {
> > + .name = "npcm-sdhci",
> > + .of_match_table = npcm_sdhci_of_match,
> > + .pm = &sdhci_pltfm_pmops,
> > + },
> > + .probe = npcm_sdhci_probe,
> > + .remove = sdhci_pltfm_unregister,
> > +};
> > +
> > +module_platform_driver(npcm_sdhci_driver);
> > +
> > +MODULE_DESCRIPTION("NPCM Secure Digital Host Controller Interface driver");
> > +MODULE_AUTHOR("Tomer Maimon <tomer.maimon@...oton.com>");
> > +MODULE_LICENSE("GPL v2");
>
> WARNING: Prefer "GPL" over "GPL v2" - see commit bf7fbeeae6db ("module: Cure the MODULE_LICENSE "GPL" vs. "GPL v2" bogosity")
> #133: FILE: drivers/mmc/host/sdhci-npcm.c:81:
> +MODULE_LICENSE("GPL v2");
>
>
Best regards,
Tomer
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