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x86: ich6_gpio: Add use-lvl-write-cache for I/O access mode

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Add a device-tree property use-lvl-write-cache that will cause
writes to lvl to be cached instead of read from lvl before each
write. This is required on some platforms that have the register
implemented as dual read/write (such as Baytrail).

Prior to this fix the blue USB port on the Minnowboard Max was
unusable since USB_HOST_EN0 was set high then immediately set
low when USB_HOST_EN1 was written.

This also resolves the 'gpio clear | set' command warning like:
  "Warning: value of pin is still 0"

Signed-off-by: George McCollister <george.mccollister@gmail.com>
<rebased on latest origin/master, fixed all baytrail boards>
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Bin Meng
2017-05-07 19:52:29 -07:00
parent 4759dffe23
commit 770ee01742
6 changed files with 55 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
arch/x86/dts/bayleybay.dts
View File

@@ -189,6 +189,7 @@
u-boot,dm-pre-reloc;
reg = <0 0x20>;
bank-name = "A";
use-lvl-write-cache;
};
gpiob {
@@ -196,6 +197,7 @@
u-boot,dm-pre-reloc;
reg = <0x20 0x20>;
bank-name = "B";
use-lvl-write-cache;
};
gpioc {
@@ -203,6 +205,7 @@
u-boot,dm-pre-reloc;
reg = <0x40 0x20>;
bank-name = "C";
use-lvl-write-cache;
};
gpiod {
@@ -210,6 +213,7 @@
u-boot,dm-pre-reloc;
reg = <0x60 0x20>;
bank-name = "D";
use-lvl-write-cache;
};
gpioe {
@@ -217,6 +221,7 @@
u-boot,dm-pre-reloc;
reg = <0x80 0x20>;
bank-name = "E";
use-lvl-write-cache;
};
gpiof {
@@ -224,6 +229,7 @@
u-boot,dm-pre-reloc;
reg = <0xA0 0x20>;
bank-name = "F";
use-lvl-write-cache;
};
};
};

6
arch/x86/dts/baytrail_som-db5800-som-6867.dts
View File

@@ -212,6 +212,7 @@
u-boot,dm-pre-reloc;
reg = <0 0x20>;
bank-name = "A";
use-lvl-write-cache;
};
gpiob {
@@ -219,6 +220,7 @@
u-boot,dm-pre-reloc;
reg = <0x20 0x20>;
bank-name = "B";
use-lvl-write-cache;
};
gpioc {
@@ -226,6 +228,7 @@
u-boot,dm-pre-reloc;
reg = <0x40 0x20>;
bank-name = "C";
use-lvl-write-cache;
};
gpiod {
@@ -233,6 +236,7 @@
u-boot,dm-pre-reloc;
reg = <0x60 0x20>;
bank-name = "D";
use-lvl-write-cache;
};
gpioe {
@@ -240,6 +244,7 @@
u-boot,dm-pre-reloc;
reg = <0x80 0x20>;
bank-name = "E";
use-lvl-write-cache;
};
gpiof {
@@ -247,6 +252,7 @@
u-boot,dm-pre-reloc;
reg = <0xA0 0x20>;
bank-name = "F";
use-lvl-write-cache;
};
};
};

6
arch/x86/dts/conga-qeval20-qa3-e3845.dts
View File

@@ -199,6 +199,7 @@
u-boot,dm-pre-reloc;
reg = <0 0x20>;
bank-name = "A";
use-lvl-write-cache;
};
gpiob {
@@ -206,6 +207,7 @@
u-boot,dm-pre-reloc;
reg = <0x20 0x20>;
bank-name = "B";
use-lvl-write-cache;
};
gpioc {
@@ -213,6 +215,7 @@
u-boot,dm-pre-reloc;
reg = <0x40 0x20>;
bank-name = "C";
use-lvl-write-cache;
};
gpiod {
@@ -220,6 +223,7 @@
u-boot,dm-pre-reloc;
reg = <0x60 0x20>;
bank-name = "D";
use-lvl-write-cache;
};
gpioe {
@@ -227,6 +231,7 @@
u-boot,dm-pre-reloc;
reg = <0x80 0x20>;
bank-name = "E";
use-lvl-write-cache;
};
gpiof {
@@ -234,6 +239,7 @@
u-boot,dm-pre-reloc;
reg = <0xA0 0x20>;
bank-name = "F";
use-lvl-write-cache;
};
};
};

6
arch/x86/dts/dfi-bt700.dtsi
View File

@@ -201,6 +201,7 @@
u-boot,dm-pre-reloc;
reg = <0 0x20>;
bank-name = "A";
use-lvl-write-cache;
};
gpiob {
@@ -208,6 +209,7 @@
u-boot,dm-pre-reloc;
reg = <0x20 0x20>;
bank-name = "B";
use-lvl-write-cache;
};
gpioc {
@@ -215,6 +217,7 @@
u-boot,dm-pre-reloc;
reg = <0x40 0x20>;
bank-name = "C";
use-lvl-write-cache;
};
gpiod {
@@ -222,6 +225,7 @@
u-boot,dm-pre-reloc;
reg = <0x60 0x20>;
bank-name = "D";
use-lvl-write-cache;
};
gpioe {
@@ -229,6 +233,7 @@
u-boot,dm-pre-reloc;
reg = <0x80 0x20>;
bank-name = "E";
use-lvl-write-cache;
};
gpiof {
@@ -236,6 +241,7 @@
u-boot,dm-pre-reloc;
reg = <0xA0 0x20>;
bank-name = "F";
use-lvl-write-cache;
};
};
};

6
arch/x86/dts/minnowmax.dts
View File

@@ -218,6 +218,7 @@
u-boot,dm-pre-reloc;
reg = <0 0x20>;
bank-name = "A";
use-lvl-write-cache;
};
gpiob {
@@ -225,6 +226,7 @@
u-boot,dm-pre-reloc;
reg = <0x20 0x20>;
bank-name = "B";
use-lvl-write-cache;
};
gpioc {
@@ -232,6 +234,7 @@
u-boot,dm-pre-reloc;
reg = <0x40 0x20>;
bank-name = "C";
use-lvl-write-cache;
};
gpiod {
@@ -239,6 +242,7 @@
u-boot,dm-pre-reloc;
reg = <0x60 0x20>;
bank-name = "D";
use-lvl-write-cache;
};
gpioe {
@@ -246,6 +250,7 @@
u-boot,dm-pre-reloc;
reg = <0x80 0x20>;
bank-name = "E";
use-lvl-write-cache;
};
gpiof {
@@ -253,6 +258,7 @@
u-boot,dm-pre-reloc;
reg = <0xA0 0x20>;
bank-name = "F";
use-lvl-write-cache;
};
};
};