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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