diff options
| author | Yong Li <sdliyong@gmail.com> | 2017-08-15 19:21:50 +0300 |
|---|---|---|
| committer | Joel Stanley <joel@jms.id.au> | 2017-12-05 03:34:25 +0300 |
| commit | 27a08c1351c4958f0cae67c78e95d6dfe0276cf6 (patch) | |
| tree | e81c0e2e59a05bbeb8b2967c1dc74762e5e14aaa | |
| parent | 34fdbfbe49177f58756d89c65b6cf0645df2f1cb (diff) | |
| download | linux-27a08c1351c4958f0cae67c78e95d6dfe0276cf6.tar.xz | |
pinctrl: aspeed: Fix ast2500 strap register write logic
On AST2500, the hardware strap register(SCU70) only accepts write ‘1’,
to clear it to ‘0’, must set bits(write ‘1’) to SCU7C
Signed-off-by: Yong Li <sdliyong@gmail.com>
Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
Tested-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
(cherry picked from commit 1865af212dfa0819ca21c7e5c18c2a75202c1827)
Signed-off-by: Joel Stanley <joel@jms.id.au>
| -rw-r--r-- | drivers/pinctrl/aspeed/pinctrl-aspeed.c | 19 | ||||
| -rw-r--r-- | drivers/pinctrl/aspeed/pinctrl-aspeed.h | 1 |
2 files changed, 18 insertions, 2 deletions
diff --git a/drivers/pinctrl/aspeed/pinctrl-aspeed.c b/drivers/pinctrl/aspeed/pinctrl-aspeed.c index a86a4d66099c..f2d5133f6993 100644 --- a/drivers/pinctrl/aspeed/pinctrl-aspeed.c +++ b/drivers/pinctrl/aspeed/pinctrl-aspeed.c @@ -183,6 +183,7 @@ static int aspeed_sig_expr_set(const struct aspeed_sig_expr *expr, { int ret; int i; + unsigned int rev_id; for (i = 0; i < expr->ndescs; i++) { const struct aspeed_sig_desc *desc = &expr->descs[i]; @@ -213,8 +214,22 @@ static int aspeed_sig_expr_set(const struct aspeed_sig_expr *expr, if (desc->ip == ASPEED_IP_SCU && desc->reg == HW_STRAP2) continue; - ret = regmap_update_bits(maps[desc->ip], desc->reg, - desc->mask, val); + /* On AST2500, Set bits in SCU7C are cleared from SCU70 */ + if (desc->ip == ASPEED_IP_SCU && desc->reg == HW_STRAP1) { + ret = regmap_read(maps[ASPEED_IP_SCU], + HW_REVISION_ID, &rev_id); + if (ret < 0) + return ret; + + if (0x04 == ((rev_id >> 24) & 0xff)) + ret = regmap_write(maps[desc->ip], + HW_REVISION_ID, (~val & desc->mask)); + else + ret = regmap_update_bits(maps[desc->ip], + desc->reg, desc->mask, val); + } else + ret = regmap_update_bits(maps[desc->ip], desc->reg, + desc->mask, val); if (ret) return ret; diff --git a/drivers/pinctrl/aspeed/pinctrl-aspeed.h b/drivers/pinctrl/aspeed/pinctrl-aspeed.h index fa125db828f5..d4d7f032c1da 100644 --- a/drivers/pinctrl/aspeed/pinctrl-aspeed.h +++ b/drivers/pinctrl/aspeed/pinctrl-aspeed.h @@ -251,6 +251,7 @@ #define SCU3C 0x3C /* System Reset Control/Status Register */ #define SCU48 0x48 /* MAC Interface Clock Delay Setting */ #define HW_STRAP1 0x70 /* AST2400 strapping is 33 bits, is split */ +#define HW_REVISION_ID 0x7C /* Silicon revision ID register */ #define SCU80 0x80 /* Multi-function Pin Control #1 */ #define SCU84 0x84 /* Multi-function Pin Control #2 */ #define SCU88 0x88 /* Multi-function Pin Control #3 */ |