1 // SPDX-License-Identifier: GPL-2.0
3  * Helper functions for MMC regulators.
11 #include <linux/mmc/host.h>
19  * mmc_ocrbitnum_to_vdd - Convert a OCR bit number to its voltage
32 		return -EINVAL;  in mmc_ocrbitnum_to_vdd()
40 	tmp = vdd_bit - ilog2(MMC_VDD_165_195);  in mmc_ocrbitnum_to_vdd()
53  * mmc_regulator_get_ocrmask - return mask of supported voltages
57  * can be provided to MMC/SD/SDIO devices using the specified voltage
59  * MMC host adapter.
95  * mmc_regulator_set_ocr - set regulator to match host->ios voltage
96  * @mmc: the host to regulate
98  * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
102  * MMC host drivers may use this to enable or disable a regulator using
106 int mmc_regulator_set_ocr(struct mmc_host *mmc,  in mmc_regulator_set_ocr()  argument
117 		if (result == 0 && !mmc->regulator_enabled) {  in mmc_regulator_set_ocr()
120 				mmc->regulator_enabled = true;  in mmc_regulator_set_ocr()
122 	} else if (mmc->regulator_enabled) {  in mmc_regulator_set_ocr()
125 			mmc->regulator_enabled = false;  in mmc_regulator_set_ocr()
129 		dev_err(mmc_dev(mmc),  in mmc_regulator_set_ocr()
146 		return -EINVAL;  in mmc_regulator_set_voltage_if_supported()
161  * mmc_regulator_set_vqmmc - Set VQMMC as per the ios
162  * @mmc: the host to regulate
169  * If this is not possible we'll try the full 2.7-3.6V of the spec.
179 int mmc_regulator_set_vqmmc(struct mmc_host *mmc, struct mmc_ios *ios)  in mmc_regulator_set_vqmmc()  argument
181 	struct device *dev = mmc_dev(mmc);  in mmc_regulator_set_vqmmc()
185 	if (IS_ERR(mmc->supply.vqmmc))  in mmc_regulator_set_vqmmc()
186 		return -EINVAL;  in mmc_regulator_set_vqmmc()
188 	switch (ios->signal_voltage) {  in mmc_regulator_set_vqmmc()
190 		return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,  in mmc_regulator_set_vqmmc()
193 		return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,  in mmc_regulator_set_vqmmc()
196 		ret = mmc_ocrbitnum_to_vdd(mmc->ios.vdd, &volt, &max_uV);  in mmc_regulator_set_vqmmc()
200 		dev_dbg(dev, "%s: found vmmc voltage range of %d-%duV\n",  in mmc_regulator_set_vqmmc()
203 		min_uV = max(volt - 300000, 2700000);  in mmc_regulator_set_vqmmc()
213 		ret = mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,  in mmc_regulator_set_vqmmc()
218 		return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,  in mmc_regulator_set_vqmmc()
221 		return -EINVAL;  in mmc_regulator_set_vqmmc()
236  * mmc_regulator_get_supply - try to get VMMC and VQMMC regulators for a host
237  * @mmc: the host to regulate
240  * or -EPROBE_DEFER. 0 means no critical error but it does not mean all
245 int mmc_regulator_get_supply(struct mmc_host *mmc)  in mmc_regulator_get_supply()  argument
247 	struct device *dev = mmc_dev(mmc);  in mmc_regulator_get_supply()
250 	mmc->supply.vmmc = devm_regulator_get_optional(dev, "vmmc");  in mmc_regulator_get_supply()
251 	mmc->supply.vqmmc = devm_regulator_get_optional(dev, "vqmmc");  in mmc_regulator_get_supply()
253 	if (IS_ERR(mmc->supply.vmmc)) {  in mmc_regulator_get_supply()
254 		if (PTR_ERR(mmc->supply.vmmc) == -EPROBE_DEFER)  in mmc_regulator_get_supply()
255 			return -EPROBE_DEFER;  in mmc_regulator_get_supply()
258 		ret = mmc_regulator_get_ocrmask(mmc->supply.vmmc);  in mmc_regulator_get_supply()
260 			mmc->ocr_avail = ret;  in mmc_regulator_get_supply()
265 	if (IS_ERR(mmc->supply.vqmmc)) {  in mmc_regulator_get_supply()
266 		if (PTR_ERR(mmc->supply.vqmmc) == -EPROBE_DEFER)  in mmc_regulator_get_supply()
267 			return -EPROBE_DEFER;  in mmc_regulator_get_supply()