[PATCH 6/6] mmc: dw_mmc-rockchip: add parsing of power control from DT

From: Shawn Lin <shawn.lin-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
To: Jaehoon Chung
	<jh80.chung-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>,
	Ulf Hansson <ulf.hansson-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
	Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Heiko Stuebner <heiko-4mtYJXux2i+zQB+pC5nmwQ@public.gmane.org>,
	Shawn Lin <shawn.lin-TNX95d0MmH7DzftRWevZcw@public.gmane.org>,
	Brian Norris
	<briannorris-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>,
	linux-mmc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Doug Anderson <dianders-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>,
	linux-rockchip-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Subject: [PATCH 6/6] mmc: dw_mmc-rockchip: add parsing of power control from DT
Date: Sat,  6 Aug 2016 13:37:47 +0800	[thread overview]
Message-ID: <1470461867-4049-1-git-send-email-shawn.lin@rock-chips.com> (raw)
In-Reply-To: <1470461784-3955-1-git-send-email-shawn.lin-TNX95d0MmH7DzftRWevZcw@public.gmane.org>

Defaultly the power io of dw_mmc is fixed which means we could
only output high level 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-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
---

 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..c5f5bb5 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->default_sample_phase = 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
