mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-29 13:53:33 +00:00
Code Issues Releases Wiki Activity

phy: rockchip: set pulldown for strobe line in dts

Browse source 
This patch add support to set the internal pulldown via dt property
and allow simplify the board design for the trace from emmc-phy to
the eMMC chipset.
Default to not set the pull-down.

This patch was inspired from the 4.4 tree of the
Rockchip SDK, where it is enabled unconditional.
The patch had been tested with our rk3399 customized board.

Signed-off-by: Chris Ruehl <chris.ruehl@gtsys.com.hk>
Link: https://lore.kernel.org/r/20201129054416.3980-2-chris.ruehl@gtsys.com.hk
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Chris Ruehl 2020-11-29 13:44:14 +08:00 committed by Vinod Koul
parent 51e339deab
commit 8b5c2b45b8
1 changed files with 16 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

16
drivers/phy/rockchip/phy-rockchip-emmc.c
View file

@ -67,6 +67,10 @@
#define PHYCTRL_OTAPDLYENA_SHIFT 0xb
#define PHYCTRL_OTAPDLYSEL_MASK 0xf
#define PHYCTRL_OTAPDLYSEL_SHIFT 0x7
#define PHYCTRL_REN_STRB_DISABLE 0x0
#define PHYCTRL_REN_STRB_ENABLE 0x1
#define PHYCTRL_REN_STRB_MASK 0x1
#define PHYCTRL_REN_STRB_SHIFT 0x9
#define PHYCTRL_IS_CALDONE(x) \
((((x) >> PHYCTRL_CALDONE_SHIFT) & \
@ -80,6 +84,7 @@ struct rockchip_emmc_phy {
struct regmap *reg_base;
struct clk *emmcclk;
unsigned int drive_impedance;
unsigned int enable_strobe_pulldown;
};
static int rockchip_emmc_phy_power(struct phy *phy, bool on_off)
@ -295,6 +300,13 @@ static int rockchip_emmc_phy_power_on(struct phy *phy)
PHYCTRL_OTAPDLYSEL_MASK,
PHYCTRL_OTAPDLYSEL_SHIFT));
/* Internal pull-down for strobe line */
regmap_write(rk_phy->reg_base,
rk_phy->reg_offset + GRF_EMMCPHY_CON2,
HIWORD_UPDATE(rk_phy->enable_strobe_pulldown,
PHYCTRL_REN_STRB_MASK,
PHYCTRL_REN_STRB_SHIFT));
/* Power up emmc phy analog blocks */
return rockchip_emmc_phy_power(phy, PHYCTRL_PDB_PWR_ON);
}
@ -359,10 +371,14 @@ static int rockchip_emmc_phy_probe(struct platform_device *pdev)
rk_phy->reg_offset = reg_offset;
rk_phy->reg_base = grf;
rk_phy->drive_impedance = PHYCTRL_DR_50OHM;
rk_phy->enable_strobe_pulldown = PHYCTRL_REN_STRB_DISABLE;
if (!of_property_read_u32(dev->of_node, "drive-impedance-ohm", &val))
rk_phy->drive_impedance = convert_drive_impedance_ohm(pdev, val);
if (of_property_read_bool(dev->of_node, "enable-strobe-pulldown"))
rk_phy->enable_strobe_pulldown = PHYCTRL_REN_STRB_ENABLE;
generic_phy = devm_phy_create(dev, dev->of_node, &ops);
if (IS_ERR(generic_phy)) {
dev_err(dev, "failed to create PHY\n");