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mfd: rtsx: Add clock divider hook

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Add callback function conv_clk_and_div_n to convert between SSC clock
and its divider N.
For rtl8411, the formula to calculate SSC clock divider N is different
with the other card reader models.

Signed-off-by: Wei WANG <wei_wang@realsil.com.cn>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Wei WANG
2013-01-23 09:51:06 +08:00
committed by Samuel Ortiz
parent ef85e736b1
commit ab4e8f8b7b
6 changed files with 31 additions and 2 deletions
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13
drivers/mfd/rtl8411.c
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@@ -178,6 +178,18 @@ static unsigned int rtl8411_cd_deglitch(struct rtsx_pcr *pcr)
return card_exist;
}
static int rtl8411_conv_clk_and_div_n(int input, int dir)
{
int output;
if (dir == CLK_TO_DIV_N)
output = input * 4 / 5 - 2;
else
output = (input + 2) * 5 / 4;
return output;
}
static const struct pcr_ops rtl8411_pcr_ops = {
.extra_init_hw = rtl8411_extra_init_hw,
.optimize_phy = NULL,
@@ -189,6 +201,7 @@ static const struct pcr_ops rtl8411_pcr_ops = {
.card_power_off = rtl8411_card_power_off,
.switch_output_voltage = rtl8411_switch_output_voltage,
.cd_deglitch = rtl8411_cd_deglitch,
.conv_clk_and_div_n = rtl8411_conv_clk_and_div_n,
};
/* SD Pull Control Enable: