On 21/08/17 10:41, Kishon Vijay Abraham I wrote: > Create a new sdhci-omap driver to configure the eMMC/SD/SDIO controller > in TI's OMAP SoCs making use of the SDHCI core library. For OMAP specific > configurations, populate sdhci_ops with OMAP specific callbacks and use > SDHCI quirks. > Enable only high speed mode for both SD and eMMC here and add other > UHS mode support later. > > Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx> There are a few minor comments below. > --- > drivers/mmc/host/Kconfig | 12 + > drivers/mmc/host/Makefile | 1 + > drivers/mmc/host/sdhci-omap.c | 629 ++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 642 insertions(+) > create mode 100644 drivers/mmc/host/sdhci-omap.c > > diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig > index 60f90d49e7a9..60d50843e165 100644 > --- a/drivers/mmc/host/Kconfig > +++ b/drivers/mmc/host/Kconfig > @@ -899,3 +899,15 @@ config MMC_SDHCI_XENON > This selects Marvell Xenon eMMC/SD/SDIO SDHCI. > If you have a controller with this interface, say Y or M here. > If unsure, say N. > + > +config MMC_SDHCI_OMAP > + tristate "TI SDHCI Controller Support" > + depends on MMC_SDHCI_PLTFM > + help > + This selects the Secure Digital Host Controller Interface (SDHCI) > + support present in TI's DRA7 SOCs. The controller supports > + SD/MMC/SDIO devices. > + > + If you have a controller with this interface, say Y or M here. > + > + If unsure, say N. > diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile > index 8c46766c000c..33181df88a10 100644 > --- a/drivers/mmc/host/Makefile > +++ b/drivers/mmc/host/Makefile > @@ -88,6 +88,7 @@ obj-$(CONFIG_MMC_SDHCI_MSM) += sdhci-msm.o > obj-$(CONFIG_MMC_SDHCI_ST) += sdhci-st.o > obj-$(CONFIG_MMC_SDHCI_MICROCHIP_PIC32) += sdhci-pic32.o > obj-$(CONFIG_MMC_SDHCI_BRCMSTB) += sdhci-brcmstb.o > +obj-$(CONFIG_MMC_SDHCI_OMAP) += sdhci-omap.o > > ifeq ($(CONFIG_CB710_DEBUG),y) > CFLAGS-cb710-mmc += -DDEBUG > diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c > new file mode 100644 > index 000000000000..73ee3b4a400c > --- /dev/null > +++ b/drivers/mmc/host/sdhci-omap.c > @@ -0,0 +1,629 @@ > +/** > + * SDHCI Controller driver for TI's OMAP SoCs > + * > + * Copyright (C) 2017 Texas Instruments > + * Author: Kishon Vijay Abraham I <kishon@xxxxxx> > + * > + * 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. > + * > + * You should have received a copy of the GNU General Public License > + * along with this program. If not, see <http://www.gnu.org/licenses/>. > + */ > + > +#include <linux/delay.h> > +#include <linux/mmc/slot-gpio.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/of_device.h> > +#include <linux/platform_device.h> > +#include <linux/pm_runtime.h> > +#include <linux/regulator/consumer.h> > + > +#include "sdhci-pltfm.h" > + > +#define SDHCI_OMAP_CON 0x12c > +#define CON_DW8 BIT(5) > +#define CON_DMA_MASTER BIT(20) > +#define CON_INIT BIT(1) > +#define CON_OD BIT(0) > + > +#define SDHCI_OMAP_CMD 0x20c > + > +#define SDHCI_OMAP_HCTL 0x228 > +#define HCTL_SDBP BIT(8) > +#define HCTL_SDVS_SHIFT 9 > +#define HCTL_SDVS_MASK (0x7 << HCTL_SDVS_SHIFT) > +#define HCTL_SDVS_33 (0x7 << HCTL_SDVS_SHIFT) > +#define HCTL_SDVS_30 (0x6 << HCTL_SDVS_SHIFT) > +#define HCTL_SDVS_18 (0x5 << HCTL_SDVS_SHIFT) > + > +#define SDHCI_OMAP_SYSCTL 0x22c > +#define SYSCTL_CEN BIT(2) > +#define SYSCTL_CLKD_SHIFT 6 > +#define SYSCTL_CLKD_MASK 0x3ff > + > +#define SDHCI_OMAP_STAT 0x230 > + > +#define SDHCI_OMAP_IE 0x234 > +#define INT_CC_EN BIT(0) > + > +#define SDHCI_OMAP_AC12 0x23c > +#define AC12_V1V8_SIGEN BIT(19) > + > +#define SDHCI_OMAP_CAPA 0x240 > +#define CAPA_VS33 BIT(24) > +#define CAPA_VS30 BIT(25) > +#define CAPA_VS18 BIT(26) > + > +#define MMC_TIMEOUT 1 /* 1 msec */ As before, SDHCI_OMAP_TIMEOUT is a better name > + > +#define SYSCTL_CLKD_MAX 0x3FF > + > +#define IOV_1V8 1800000 /* 180000 uV */ > +#define IOV_3V0 3000000 /* 300000 uV */ > +#define IOV_3V3 3300000 /* 330000 uV */ > + > +struct sdhci_omap_data { > + u32 offset; > +}; > + > +struct sdhci_omap_host { > + void __iomem *base; > + struct device *dev; > + struct regulator *pbias; > + bool pbias_enabled; > + struct sdhci_host *host; > + unsigned int flags; > + > +#define SDHCI_OMAP_SUPPORTS_DUAL_VOLT BIT(0) > +#define SDHCI_OMAP_NO_1_8_V BIT(1) > + > + u8 bus_mode; > + u8 power_mode; > + bool io_3_3v_support; > +}; > + > +static inline u32 sdhci_omap_readl(struct sdhci_omap_host *host, > + unsigned int offset) > +{ > + return readl(host->base + offset); > +} > + > +static inline void sdhci_omap_writel(struct sdhci_omap_host *host, > + unsigned int offset, u32 data) > +{ > + writel(data, host->base + offset); > +} > + > +static int sdhci_omap_set_pbias(struct sdhci_omap_host *omap_host, > + bool power_on, unsigned int iov) > +{ > + int ret; > + struct device *dev = omap_host->dev; > + > + if (IS_ERR(omap_host->pbias)) > + return 0; > + > + if (power_on) { > + ret = regulator_set_voltage(omap_host->pbias, iov, iov); > + if (ret) { > + dev_err(dev, "pbias set voltage failed\n"); > + return ret; > + } > + > + if (omap_host->pbias_enabled) > + return 0; > + > + ret = regulator_enable(omap_host->pbias); > + if (ret) { > + dev_err(dev, "pbias reg enable fail\n"); > + return ret; > + } > + > + omap_host->pbias_enabled = true; > + } else { > + if (!omap_host->pbias_enabled) > + return 0; > + > + ret = regulator_disable(omap_host->pbias); > + if (ret) { > + dev_err(dev, "pbias reg disable fail\n"); > + return ret; > + } > + omap_host->pbias_enabled = false; > + } > + > + return 0; > +} > + > +static int sdhci_omap_enable_iov(struct sdhci_omap_host *omap_host, > + unsigned int iov) > +{ > + int ret; > + struct sdhci_host *host = omap_host->host; > + struct mmc_host *mmc = host->mmc; > + > + ret = sdhci_omap_set_pbias(omap_host, false, 0); > + if (ret) > + return ret; > + > + if (!IS_ERR(mmc->supply.vqmmc)) { > + ret = regulator_set_voltage(mmc->supply.vqmmc, iov, iov); > + if (ret) { > + dev_err(mmc_dev(mmc), "vqmmc set voltage failed\n"); > + return ret; > + } > + } > + > + ret = sdhci_omap_set_pbias(omap_host, true, iov); > + if (ret) > + return ret; > + > + return 0; > +} > + > +static void sdhci_omap_conf_bus_power(struct sdhci_omap_host *omap_host, > + unsigned char signal_voltage) > +{ > + u32 reg; > + ktime_t timeout; > + > + reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_HCTL); > + reg &= ~HCTL_SDVS_MASK; > + > + if (signal_voltage == MMC_SIGNAL_VOLTAGE_180) > + reg |= HCTL_SDVS_18; > + else if (omap_host->io_3_3v_support) > + reg |= HCTL_SDVS_33; > + else > + reg |= HCTL_SDVS_30; > + > + sdhci_omap_writel(omap_host, SDHCI_OMAP_HCTL, reg); > + > + reg |= HCTL_SDBP; > + sdhci_omap_writel(omap_host, SDHCI_OMAP_HCTL, reg); > + > + /* wait 1ms */ > + timeout = ktime_add_ms(ktime_get(), MMC_TIMEOUT); > + while (!(sdhci_omap_readl(omap_host, SDHCI_OMAP_HCTL) & HCTL_SDBP)) { > + if (WARN_ON(ktime_after(ktime_get(), timeout))) > + return; > + usleep_range(5, 10); > + } > +} > + > +static int sdhci_omap_start_signal_voltage_switch(struct mmc_host *mmc, > + struct mmc_ios *ios) > +{ > + u32 reg; > + int ret; > + unsigned int iov; > + struct sdhci_host *host = mmc_priv(mmc); > + struct sdhci_pltfm_host *pltfm_host; > + struct sdhci_omap_host *omap_host; > + struct device *dev; > + > + pltfm_host = sdhci_priv(host); > + omap_host = sdhci_pltfm_priv(pltfm_host); > + dev = omap_host->dev; > + > + if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) { > + reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA); > + if (!(reg & (CAPA_VS33 | CAPA_VS30))) > + return -EOPNOTSUPP; > + > + sdhci_omap_conf_bus_power(omap_host, ios->signal_voltage); > + > + reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12); > + reg &= ~AC12_V1V8_SIGEN; > + sdhci_omap_writel(omap_host, SDHCI_OMAP_AC12, reg); > + > + if (omap_host->io_3_3v_support) > + iov = IOV_3V3; > + else > + iov = IOV_3V0; > + } else if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180) { > + reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA); > + if (!(reg & CAPA_VS18)) > + return -EOPNOTSUPP; > + > + sdhci_omap_conf_bus_power(omap_host, ios->signal_voltage); > + > + reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12); > + reg |= AC12_V1V8_SIGEN; > + sdhci_omap_writel(omap_host, SDHCI_OMAP_AC12, reg); > + > + iov = IOV_1V8; > + } else { > + return -EOPNOTSUPP; > + } > + > + ret = sdhci_omap_enable_iov(omap_host, iov); > + if (ret) { > + dev_err(dev, "failed to switch IO voltage to %dmV\n", iov); > + return ret; > + } > + > + dev_dbg(dev, "IO voltage switched to %dmV\n", iov); > + return 0; > +} > + > +static void sdhci_omap_set_bus_mode(struct sdhci_omap_host *omap_host, > + unsigned int mode) > +{ > + u32 reg; > + > + if (omap_host->bus_mode == mode) > + return; > + > + reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON); > + if (mode == MMC_BUSMODE_OPENDRAIN) > + reg |= CON_OD; > + else > + reg &= ~CON_OD; > + sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg); > + > + omap_host->bus_mode = mode; > +} > + > +void sdhci_omap_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) > +{ > + struct sdhci_host *host = mmc_priv(mmc); > + struct sdhci_pltfm_host *pltfm_host; > + struct sdhci_omap_host *omap_host; > + > + pltfm_host = sdhci_priv(host); > + omap_host = sdhci_pltfm_priv(pltfm_host); > + > + sdhci_omap_set_bus_mode(omap_host, ios->bus_mode); > + sdhci_set_ios(mmc, ios); > +} > + > +static void sdhci_omap_set_capabilities(struct sdhci_omap_host *omap_host) > +{ > + u32 reg; > + > + /* voltage capabilities might be set by boot loader, clear it */ > + reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA); > + reg &= ~(CAPA_VS18 | CAPA_VS30 | CAPA_VS33); > + > + if (omap_host->flags & SDHCI_OMAP_SUPPORTS_DUAL_VOLT) { > + if (omap_host->io_3_3v_support) > + reg |= (CAPA_VS33 | CAPA_VS18); > + else > + reg |= (CAPA_VS30 | CAPA_VS18); > + } else if (omap_host->flags & SDHCI_OMAP_NO_1_8_V) { > + if (omap_host->io_3_3v_support) > + reg |= CAPA_VS33; > + else > + reg |= CAPA_VS30; > + } else { > + reg |= CAPA_VS18; > + } > + > + sdhci_omap_writel(omap_host, SDHCI_OMAP_CAPA, reg); > +} > + > +static u16 sdhci_omap_calc_divisor(struct sdhci_pltfm_host *host, > + unsigned int clock) > +{ > + u16 dsor; > + > + dsor = DIV_ROUND_UP(clk_get_rate(host->clk), clock); > + if (dsor > SYSCTL_CLKD_MAX) > + dsor = SYSCTL_CLKD_MAX; > + > + return dsor; > +} > + > +static void sdhci_omap_start_clock(struct sdhci_omap_host *omap_host) > +{ > + u32 reg; > + > + reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_SYSCTL); > + reg |= SYSCTL_CEN; > + sdhci_omap_writel(omap_host, SDHCI_OMAP_SYSCTL, reg); > +} > + > +static void sdhci_omap_stop_clock(struct sdhci_omap_host *omap_host) > +{ > + u32 reg; > + > + reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_SYSCTL); > + reg &= ~SYSCTL_CEN; > + sdhci_omap_writel(omap_host, SDHCI_OMAP_SYSCTL, reg); > +} > + > +static void sdhci_omap_set_clock(struct sdhci_host *host, unsigned int clock) > +{ > + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); > + struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host); > + unsigned long clkdiv; > + > + if (!clock) > + return; Are you sure you don't want to stop the clock. > + > + sdhci_omap_stop_clock(omap_host); > + > + clkdiv = sdhci_omap_calc_divisor(pltfm_host, clock); > + clkdiv = (clkdiv & SYSCTL_CLKD_MASK) << SYSCTL_CLKD_SHIFT; > + sdhci_enable_clk(host, clkdiv); > + > + sdhci_omap_start_clock(omap_host); > +} > + > +void sdhci_omap_set_power(struct sdhci_host *host, unsigned char mode, > + unsigned short vdd) > +{ > + struct mmc_host *mmc = host->mmc; > + > + mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd); > +} > + > +static int sdhci_omap_enable_dma(struct sdhci_host *host) > +{ > + u32 reg; > + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); > + struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host); > + > + reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON); > + reg |= CON_DMA_MASTER; > + sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg); > + > + return 0; > +} > + > +unsigned int sdhci_omap_get_min_clock(struct sdhci_host *host) > +{ > + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); > + > + return clk_get_rate(pltfm_host->clk) / SYSCTL_CLKD_MAX; > +} > + > +static void sdhci_omap_set_bus_width(struct sdhci_host *host, int width) > +{ > + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); > + struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host); > + u32 reg; > + > + reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON); > + if (width == MMC_BUS_WIDTH_8) > + reg |= CON_DW8; > + else > + reg &= ~CON_DW8; > + sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg); > + > + sdhci_set_bus_width(host, width); > +} > + > +static void sdhci_omap_init_74_clocks(struct sdhci_host *host, u8 power_mode) > +{ > + u32 reg; > + ktime_t timeout; > + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); > + struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host); > + > + if (omap_host->power_mode == power_mode) > + return; > + > + if (power_mode != MMC_POWER_ON) > + return; > + > + disable_irq(host->irq); > + > + reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON); > + reg |= CON_INIT; > + sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg); > + sdhci_omap_writel(omap_host, SDHCI_OMAP_CMD, 0x0); > + > + /* wait 1ms */ > + timeout = ktime_add_ms(ktime_get(), MMC_TIMEOUT); > + while (!(sdhci_omap_readl(omap_host, SDHCI_OMAP_STAT) & INT_CC_EN)) { > + if (WARN_ON(ktime_after(ktime_get(), timeout))) > + return; > + usleep_range(5, 10); > + } > + > + reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON); > + reg &= ~CON_INIT; > + sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg); > + sdhci_omap_writel(omap_host, SDHCI_OMAP_STAT, INT_CC_EN); > + > + enable_irq(host->irq); > + > + omap_host->power_mode = power_mode; > +} > + > +static struct sdhci_ops sdhci_omap_ops = { > + .set_clock = sdhci_omap_set_clock, > + .set_power = sdhci_omap_set_power, > + .enable_dma = sdhci_omap_enable_dma, > + .get_max_clock = sdhci_pltfm_clk_get_max_clock, > + .get_min_clock = sdhci_omap_get_min_clock, > + .set_bus_width = sdhci_omap_set_bus_width, > + .platform_send_init_74_clocks = sdhci_omap_init_74_clocks, > + .reset = sdhci_reset, > + .set_uhs_signaling = sdhci_set_uhs_signaling, > +}; > + > +void sdhci_omap_get_of_property(struct sdhci_omap_host *omap_host) > +{ > + struct device *dev = omap_host->dev; > + struct sdhci_host *host = omap_host->host; > + struct mmc_host *mmc = host->mmc; > + > + if (device_property_read_bool(dev, "ti,dual-volt")) > + omap_host->flags |= SDHCI_OMAP_SUPPORTS_DUAL_VOLT; > + > + if (device_property_read_bool(dev, "no-1-8-v")) > + omap_host->flags |= SDHCI_OMAP_NO_1_8_V; > + > + if (device_property_read_bool(dev, "ti,non-removable")) > + mmc->caps |= MMC_CAP_NONREMOVABLE; > +} > + > +static const struct sdhci_pltfm_data sdhci_omap_pdata = { > + .quirks = SDHCI_QUIRK_BROKEN_CARD_DETECTION | > + SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK | > + SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN | > + SDHCI_QUIRK_NO_HISPD_BIT | > + SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC, > + .quirks2 = SDHCI_QUIRK2_NO_1_8_V | > + SDHCI_QUIRK2_ACMD23_BROKEN | > + SDHCI_QUIRK2_RSP_136_HAS_CRC, > + .ops = &sdhci_omap_ops, > +}; > + > +static const struct sdhci_omap_data dra7_data = { > + .offset = 0x200, > +}; > + > +static const struct of_device_id omap_sdhci_match[] = { > + { .compatible = "ti,dra7-sdhci", .data = &dra7_data }, > + {}, > +}; > +MODULE_DEVICE_TABLE(of, omap_sdhci_match); > + > +static int sdhci_omap_probe(struct platform_device *pdev) > +{ > + int ret; > + u32 offset; > + struct device *dev = &pdev->dev; > + struct sdhci_host *host; > + struct sdhci_pltfm_host *pltfm_host; > + struct sdhci_omap_host *omap_host; > + struct mmc_host *mmc; > + const struct of_device_id *match; > + struct sdhci_omap_data *data; > + > + match = of_match_device(omap_sdhci_match, dev); > + if (!match) > + return -EINVAL; > + > + data = (struct sdhci_omap_data *)match->data; > + if (!data) { > + dev_err(dev, "no sdhci omap data\n"); > + return -EINVAL; > + } > + > + offset = data->offset; > + > + host = sdhci_pltfm_init(pdev, &sdhci_omap_pdata, > + sizeof(*omap_host)); > + if (IS_ERR(host)) { > + dev_err(dev, "Failed sdhci_pltfm_init\n"); > + return PTR_ERR(host); > + } > + > + pltfm_host = sdhci_priv(host); > + omap_host = sdhci_pltfm_priv(pltfm_host); > + omap_host->host = host; > + omap_host->base = host->ioaddr; > + omap_host->dev = dev; > + sdhci_omap_get_of_property(omap_host); > + > + host->ioaddr += offset; > + > + mmc = host->mmc; > + ret = mmc_of_parse(mmc); > + if (ret) > + goto err_of_parse; > + > + pltfm_host->clk = devm_clk_get(dev, "fck"); > + if (IS_ERR(pltfm_host->clk)) { > + ret = PTR_ERR(pltfm_host->clk); > + goto err_of_parse; > + } > + > + ret = clk_set_rate(pltfm_host->clk, mmc->f_max); > + if (ret) { > + dev_err(dev, "failed to set clock to %d\n", mmc->f_max); > + goto err_of_parse; > + } > + > + omap_host->pbias = devm_regulator_get_optional(dev, "pbias"); > + if (IS_ERR(omap_host->pbias)) { > + ret = PTR_ERR(omap_host->pbias); > + if (ret != -ENODEV) { > + dev_err(dev, "CONFIG_REGULATOR_PBIAS not enabled??\n"); > + return ret; > + } > + dev_dbg(dev, "unable to get pbias regulator %ld\n", > + PTR_ERR(omap_host->pbias)); > + } else { > + if (regulator_is_supported_voltage(omap_host->pbias, IOV_3V3, > + IOV_3V3)) > + omap_host->io_3_3v_support = true; > + dev_vdbg(dev, "Max PBIAS support Voltage: %dmv\n", > + omap_host->io_3_3v_support ? IOV_3V3 : IOV_3V0); > + } > + omap_host->pbias_enabled = false; > + > + /* Enable main Func clock, interface clock and program SYSCONFIG */ Maybe also mention that the PM domain does those things. Out of curiousity, what happens if CONFIG_PM is not set? > + pm_runtime_enable(dev); > + ret = pm_runtime_get_sync(dev); > + if (ret < 0) { > + dev_err(dev, "pm_runtime_get_sync failed\n"); > + goto err_get_sync; The correct "undo" function for pm_runtime_get_sync() failing is pm_runtime_put_noidle() not pm_runtime_put_sync(). So: pm_runtime_put_noidle(dev); goto err_rpm_disable; > + } > + > + sdhci_omap_set_capabilities(omap_host); > + > + host->mmc_host_ops.get_ro = mmc_gpio_get_ro; > + host->mmc_host_ops.start_signal_voltage_switch = > + sdhci_omap_start_signal_voltage_switch; > + host->mmc_host_ops.set_ios = sdhci_omap_set_ios; > + > + sdhci_read_caps(host); > + host->caps |= SDHCI_CAN_DO_ADMA2; > + > + ret = sdhci_add_host(host); > + if (ret) > + goto err_get_sync; > + > + return 0; > + > +err_get_sync: It is more usual for error labels to describe what they will do rather than what failed. i.e. this would be err_put_sync: > + pm_runtime_put_sync(dev); err_rpm_disable: > + pm_runtime_disable(dev); > + > +err_of_parse: err_pltfm_free: > + sdhci_pltfm_free(pdev); > + return ret; > +} > + > +static int sdhci_omap_remove(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct sdhci_host *host = platform_get_drvdata(pdev); > + > + sdhci_remove_host(host, true); > + pm_runtime_put_sync(dev); > + pm_runtime_disable(dev); > + sdhci_pltfm_free(pdev); > + > + return 0; > +} > + > +static struct platform_driver sdhci_omap_driver = { > + .probe = sdhci_omap_probe, > + .remove = sdhci_omap_remove, > + .driver = { > + .name = "sdhci-omap", > + .of_match_table = of_match_ptr(omap_sdhci_match), Don't you need #ifdef CONFIG_OF around the table if you use of_match_ptr()? > + }, > +}; > + > +module_platform_driver(sdhci_omap_driver); > + > +MODULE_DESCRIPTION("SDHCI driver for OMAP SoCs"); > +MODULE_AUTHOR("Texas Instruments Inc."); > +MODULE_LICENSE("GPL v2"); > +MODULE_ALIAS("OMAP SDHCI Driver"); A module alias with spaces in it looks strange. 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