linux-kernel - [RFC PATCH 2/4] phy: rockchip: Add inno_is_valid_phy

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Date:   Sun,  2 Oct 2022 08:45:38 +0200
From:   Michael Trimarchi <michael@...rulasolutions.com>
To:     Sandy Huang <hjc@...k-chips.com>,
        Heiko Stübner <heiko@...ech.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-phy@...ts.infradead.org, linux-amarula@...rulasolutions.com
Subject: [RFC PATCH 2/4] phy: rockchip: Add inno_is_valid_phy_mode

The function is used to avoid to enable clock on the hardware
if the mode requested is invalid

Signed-off-by: Michael Trimarchi <michael@...rulasolutions.com>
---
 .../phy/rockchip/phy-rockchip-inno-dsidphy.c  | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/phy/rockchip/phy-rockchip-inno-dsidphy.c b/drivers/phy/rockchip/phy-rockchip-inno-dsidphy.c
index 630e01b5c19b..644cf73cfd53 100644
--- a/drivers/phy/rockchip/phy-rockchip-inno-dsidphy.c
+++ b/drivers/phy/rockchip/phy-rockchip-inno-dsidphy.c
@@ -217,6 +217,20 @@ static void phy_update_bits(struct inno_dsidphy *inno,
 	writel(tmp, inno->phy_base + reg);
 }
 
+static int inno_is_valid_phy_mode(struct inno_dsidphy *inno)
+{
+	switch (inno->mode) {
+	case PHY_MODE_MIPI_DPHY:
+		break;
+	case PHY_MODE_LVDS:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+};
+
 static unsigned long inno_dsidphy_pll_calc_rate(struct inno_dsidphy *inno,
 						unsigned long rate)
 {
@@ -495,6 +509,11 @@ static void inno_dsidphy_lvds_mode_enable(struct inno_dsidphy *inno)
 static int inno_dsidphy_power_on(struct phy *phy)
 {
 	struct inno_dsidphy *inno = phy_get_drvdata(phy);
+	int ret = 0;
+
+	ret = inno_is_valid_phy_mode(inno);
+	if (ret)
+		return ret;
 
 	clk_prepare_enable(inno->pclk_phy);
 	clk_prepare_enable(inno->ref_clk);
-- 
2.34.1