Implement voltage switch, supporting modes up to SDR-50. Based on work by Shinobu Uehara, Rob Taylor, William Towle and Ian Molton. This uses two voltage regulators, one external and one on the pfc. Signed-off-by: Ben Hutchings <ben.hutchings@xxxxxxxxxxxxxxx> --- drivers/mmc/host/sh_mobile_sdhi.c | 48 +++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) diff --git a/drivers/mmc/host/sh_mobile_sdhi.c b/drivers/mmc/host/sh_mobile_sdhi.c index 92a58c6007fe..c8538a256e22 100644 --- a/drivers/mmc/host/sh_mobile_sdhi.c +++ b/drivers/mmc/host/sh_mobile_sdhi.c @@ -30,6 +30,7 @@ #include <linux/mfd/tmio.h> #include <linux/sh_dma.h> #include <linux/delay.h> +#include <linux/regulator/consumer.h> #include "tmio_mmc.h" @@ -84,6 +85,7 @@ MODULE_DEVICE_TABLE(of, sh_mobile_sdhi_of_match); struct sh_mobile_sdhi { struct clk *clk; + struct regulator *vqmmc_ref; struct tmio_mmc_data mmc_data; struct tmio_mmc_dma dma_priv; }; @@ -148,6 +150,41 @@ static void sh_mobile_sdhi_set_clk_div(struct platform_device *pdev, int clk) } } +static int sh_mobile_sdhi_start_signal_voltage_switch( + struct tmio_mmc_host *host, unsigned char signal_voltage) +{ + struct sh_mobile_sdhi *priv = host_to_priv(host); + int min_uV, max_uV; + int ret; + + if (signal_voltage == MMC_SIGNAL_VOLTAGE_330) { + min_uV = 2700000; + max_uV = 3600000; + } else if (signal_voltage == MMC_SIGNAL_VOLTAGE_180) { + min_uV = 1700000; + max_uV = 1950000; + } else { + return -EINVAL; + } + + if (!IS_ERR(host->mmc->supply.vqmmc)) { + ret = regulator_set_voltage(host->mmc->supply.vqmmc, + min_uV, max_uV); + if (ret) + return ret; + } + + if (!IS_ERR(priv->vqmmc_ref)) { + ret = regulator_set_voltage(priv->vqmmc_ref, + min_uV, max_uV); + if (ret) + return ret; + } + + usleep_range(5000, 5500); + return 0; +} + static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host) { int timeout = 1000; @@ -240,6 +277,13 @@ static int sh_mobile_sdhi_probe(struct platform_device *pdev) goto eprobe; } + priv->vqmmc_ref = devm_regulator_get_optional(&pdev->dev, "vqmmc-ref"); + if (IS_ERR(priv->vqmmc_ref)) { + if (PTR_ERR(priv->vqmmc_ref) == -EPROBE_DEFER) + return -EPROBE_DEFER; + dev_info(&pdev->dev, "No vqmmc reference regulator found\n"); + } + host = tmio_mmc_host_alloc(pdev); if (!host) { ret = -ENOMEM; @@ -253,6 +297,10 @@ static int sh_mobile_sdhi_probe(struct platform_device *pdev) host->clk_enable = sh_mobile_sdhi_clk_enable; host->clk_disable = sh_mobile_sdhi_clk_disable; host->multi_io_quirk = sh_mobile_sdhi_multi_io_quirk; + + host->start_signal_voltage_switch + = sh_mobile_sdhi_start_signal_voltage_switch; + /* SD control register space size is 0x100, 0x200 for bus_shift=1 */ if (resource_size(res) > 0x100) host->bus_shift = 1; -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html