From c54734e831d5080d8112162b77bf24773b665b02 Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Mon, 7 Jan 2019 23:13:20 +0100 Subject: [PATCH] pinctrl: sh-pfc: r8a7794: Initialize TDSEL register for ES1.0 Documentation for ES1.0 says that some bits in TDSEL must be set (ch 5.3.35 in R-Car E2 v0.5). However, the reset value of the register is 0, so software has to do it. Add this to the kernel driver to ensure this is really done independent of firmware versions and use whitelisting for ES versions known to need this. This is needed for some SD cards supporting SDR104 transfer mode. Signed-off-by: Wolfram Sang Reviewed-by: Simon Horman Signed-off-by: Geert Uytterhoeven --- drivers/pinctrl/sh-pfc/pfc-r8a7794.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/pinctrl/sh-pfc/pfc-r8a7794.c b/drivers/pinctrl/sh-pfc/pfc-r8a7794.c index fcf1339c4058..958a5f714c93 100644 --- a/drivers/pinctrl/sh-pfc/pfc-r8a7794.c +++ b/drivers/pinctrl/sh-pfc/pfc-r8a7794.c @@ -8,6 +8,7 @@ */ #include +#include #include "core.h" #include "sh_pfc.h" @@ -5560,7 +5561,22 @@ static int r8a7794_pin_to_pocctrl(struct sh_pfc *pfc, unsigned int pin, u32 *poc return -EINVAL; } +static const struct soc_device_attribute r8a7794_tdsel[] = { + { .soc_id = "r8a7794", .revision = "ES1.0" }, + { /* sentinel */ } +}; + +static int r8a7794_pinmux_soc_init(struct sh_pfc *pfc) +{ + /* Initialize TDSEL on old revisions */ + if (soc_device_match(r8a7794_tdsel)) + sh_pfc_write(pfc, 0xe6060068, 0x55555500); + + return 0; +} + static const struct sh_pfc_soc_operations r8a7794_pinmux_ops = { + .init = r8a7794_pinmux_soc_init, .pin_to_pocctrl = r8a7794_pin_to_pocctrl, }; -- 2.25.1