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pinctrl: sh-pfc: r8a7794: Initialize TDSEL register for ES1.0

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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 <wsa+renesas@sang-engineering.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
This commit is contained in:
Wolfram Sang 2019-01-07 23:13:20 +01:00 committed by Geert Uytterhoeven
parent 95c2d0efa0
commit c54734e831
1 changed files with 16 additions and 0 deletions
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16
drivers/pinctrl/sh-pfc/pfc-r8a7794.c
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@ -8,6 +8,7 @@
*/
#include <linux/kernel.h>
#include <linux/sys_soc.h>
#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,
};