Re: [RFC PATCH 5/7] mmc: sh_mobile_sdhi: Add UHS-I mode support

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Hello.

On 04/30/2015 03:32 PM, Ben Hutchings wrote:

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
[...]
@@ -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;
+	}

   The above is asking to be a *switch* statement.

[...]

WBR, Sergei

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