From mboxrd@z Thu Jan 1 00:00:00 1970 From: Baolin Wang Subject: [PATCH 1/3] mmc: sdhci-sprd: Add start_signal_voltage_switch ops Date: Fri, 21 Jun 2019 14:12:31 +0800 Message-ID: <89fb15e88f33a3c1ce7b5eefa9414a20c984c579.1561094029.git.baolin.wang@linaro.org> References: Return-path: In-Reply-To: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org To: adrian.hunter@intel.com, ulf.hansson@linaro.org, zhang.lyra@gmail.com, orsonzhai@gmail.com, robh+dt@kernel.org, mark.rutland@arm.com Cc: baolin.wang@linaro.org, vincent.guittot@linaro.org, linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org List-Id: devicetree@vger.kernel.org For Spreadtrum SD host controller, we can not use standard SD registers to change and detect the I/O voltage signals, since our voltage regulator for I/O is fixed in hardware, and no signals were connected to the SD controller. Thus add Spreadtrum specific voltage switch ops to change voltage instead of using standard SD host registers. Signed-off-by: Baolin Wang --- drivers/mmc/host/sdhci-sprd.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c index 024c3c5..8b23c88 100644 --- a/drivers/mmc/host/sdhci-sprd.c +++ b/drivers/mmc/host/sdhci-sprd.c @@ -403,6 +403,22 @@ static void sdhci_sprd_request(struct mmc_host *mmc, struct mmc_request *mrq) sdhci_request(mmc, mrq); } +static int sdhci_sprd_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios) +{ + int ret; + + if (!IS_ERR(mmc->supply.vqmmc)) { + ret = mmc_regulator_set_vqmmc(mmc, ios); + if (ret) { + pr_err("%s: Switching signalling voltage failed\n", + mmc_hostname(mmc)); + return ret; + } + } + + return 0; +} + static void sdhci_sprd_hs400_enhanced_strobe(struct mmc_host *mmc, struct mmc_ios *ios) { @@ -470,6 +486,14 @@ static int sdhci_sprd_probe(struct platform_device *pdev) host->mmc_host_ops.request = sdhci_sprd_request; host->mmc_host_ops.hs400_enhanced_strobe = sdhci_sprd_hs400_enhanced_strobe; + /* + * We can not use the standard ops to change and detect the voltage + * signal for Spreadtrum SD host controller, since our voltage regulator + * for I/O is fixed in hardware, that means we do not need control + * the standard SD host controller to change the I/O voltage. + */ + host->mmc_host_ops.start_signal_voltage_switch = + sdhci_sprd_voltage_switch; host->mmc->caps = MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED | MMC_CAP_ERASE | MMC_CAP_CMD23; -- 1.7.9.5