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Subject[PATCH v2 6/6] mmc: dw_mmc-rockchip: add parsing of power control from DT
Date
By default, the power io of dw_mmc is fixed which means we could
only output high level voltage to indicate the power-on state.
But that is not always correct as the usage of power io should
be board specific. Let's expose it to dt for supporting this
kind of specific design.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>

---

Changes in v2:
- fix copy-paste err and typo

drivers/mmc/host/dw_mmc-rockchip.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/drivers/mmc/host/dw_mmc-rockchip.c b/drivers/mmc/host/dw_mmc-rockchip.c
index 25eae35..2e51202 100644
--- a/drivers/mmc/host/dw_mmc-rockchip.c
+++ b/drivers/mmc/host/dw_mmc-rockchip.c
@@ -24,6 +24,7 @@ struct dw_mci_rockchip_priv_data {
struct clk *drv_clk;
struct clk *sample_clk;
int default_sample_phase;
+ bool power_invert;
};

static void dw_mci_rk3288_set_ios(struct dw_mci *host, struct mmc_ios *ios)
@@ -67,6 +68,10 @@ static void dw_mci_rk3288_set_ios(struct dw_mci *host, struct mmc_ios *ios)
if (!IS_ERR(priv->sample_clk))
clk_set_phase(priv->sample_clk, priv->default_sample_phase);

+ /* Make sure we need to invert the output of PWREN */
+ if (priv->power_invert)
+ set_bit(DW_MMC_CARD_PWR_INVERT, &host->cur_slot->flags);
+
/*
* Set the drive phase offset based on speed mode to achieve hold times.
*
@@ -267,6 +272,9 @@ static int dw_mci_rk3288_parse_dt(struct dw_mci *host)
&priv->default_sample_phase))
priv->default_sample_phase = 0;

+ if (of_property_read_bool(np, "rockchip,power-invert"))
+ priv->power_invert = true;
+
priv->drv_clk = devm_clk_get(host->dev, "ciu-drive");
if (IS_ERR(priv->drv_clk))
dev_dbg(host->dev, "ciu_drv not available\n");
--
2.3.7

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