On Tue, Jul 17, 2012 at 02:30:17PM +0200, Dirk Behme wrote:
> On 13.06.2012 14:34, Richard Zhao wrote:
> >Sometimes, boards have gpios that don't own by any driver or owner
> >by a generic driver that don't like hacks. Such gpios is normally
> >output and need setup once on boot. So I introduce the config-on-boot
> >gpios.
> >
> >Signed-off-by: Richard Zhao <richard.zhao@xxxxxxxxxxxxx>
> >Cc: Shawn Guo <shawn.guo@xxxxxxxxxx>
> >Cc: Rob Herring <rob.herring@xxxxxxxxxxx>
> >Cc: Grant Likely <grant.likely@xxxxxxxxxxxx>
> >---
> > .../devicetree/bindings/arm/config-on-boot.txt | 12 +++++++
> > arch/arm/boot/dts/imx6q-sabrelite.dts | 7 ++++
> > arch/arm/mach-imx/mach-imx6q.c | 35 ++++++++++++++++++++
> > 3 files changed, 54 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/arm/config-on-boot.txt
> >
> >diff --git a/Documentation/devicetree/bindings/arm/config-on-boot.txt b/Documentation/devicetree/bindings/arm/config-on-boot.txt
> >new file mode 100644
> >index 0000000..f98ed74
> >--- /dev/null
> >+++ b/Documentation/devicetree/bindings/arm/config-on-boot.txt
> >@@ -0,0 +1,12 @@
> >+* Configure on Boot
> >+
> >+Node name: config-on-boot
> >+ It must be in root node. config-on-boot means to describe settings that needs
> >+ to be set one time on boot but aren't owned by any driver, or the owned driver
> >+ is too generic to handle such settings. For example, usb hub uses generic
> >+ driver in usb core code, a on-board usb may need deassert reset pin.
> >+
> >+Optional properties:
> >+- output-gpios: Output gpio array that needs to set.
> >+- output-gpio-values: This property is required if output-gpios is set.
> >+ The value is a array of 0 or 1. Total count eaquals the number of gpios.
> >diff --git a/arch/arm/boot/dts/imx6q-sabrelite.dts b/arch/arm/boot/dts/imx6q-sabrelite.dts
> >index e0ec929..1dd2261 100644
> >--- a/arch/arm/boot/dts/imx6q-sabrelite.dts
> >+++ b/arch/arm/boot/dts/imx6q-sabrelite.dts
> >@@ -17,6 +17,13 @@
> > model = "Freescale i.MX6 Quad SABRE Lite Board";
> > compatible = "fsl,imx6q-sabrelite", "fsl,imx6q";
> >+ config-on-boot {
> >+ output-gpios = <
> >+ &gpio3 22 0>; /* vbus reset */
> >+ output-gpio-values = <
> >+ 1>; /* vbus reset */
> >+ };
> >+
> > memory {
> > reg = <0x10000000 0x40000000>;
> > };
> >diff --git a/arch/arm/mach-imx/mach-imx6q.c b/arch/arm/mach-imx/mach-imx6q.c
> >index b47e98b..577cf19 100644
> >--- a/arch/arm/mach-imx/mach-imx6q.c
> >+++ b/arch/arm/mach-imx/mach-imx6q.c
> >@@ -19,6 +19,7 @@
> > #include <linux/irqdomain.h>
> > #include <linux/of.h>
> > #include <linux/of_address.h>
> >+#include <linux/of_gpio.h>
> > #include <linux/of_irq.h>
> > #include <linux/of_platform.h>
> > #include <linux/pinctrl/machine.h>
> >@@ -113,6 +114,38 @@ static void __init imx6q_sabrelite_init(void)
> > imx6q_sabrelite_cko1_setup();
> > }
> >+static void __init imx6q_config_on_boot(void)
> >+{
> >+ struct device_node *np;
> >+ struct property *pp;
> >+ int cnt, len, i;
> >+ int gpio;
> >+
> >+ np = of_find_node_by_path("/config-on-boot");
> >+ if (!np)
> >+ return;
> >+ cnt = of_gpio_named_count(np, "output-gpios");
> >+ pp = of_find_property(np, "output-gpio-values", &len);
> >+ if (!pp || cnt != len / sizeof(u32)) {
> >+ pr_err("Invalid config-on-boot gpios!\n");
> >+ of_node_put(np);
> >+ return;
> >+ }
> >+ for (i = 0; i < cnt; i++) {
> >+ gpio = of_get_named_gpio(np, "output-gpios", i);
> >+ if (gpio_is_valid(gpio))
> >+ gpio_request_one(gpio, GPIOF_OUT_INIT_HIGH,
> >+ "config-on-boot");
>
> While trying to use this code: Is there a special reason why all
> pins are set to HIGH here? The contents of 'output-gpio-values' seem
> to be ignored?
It may be bug here. The patch is rejected. imx6_sabrelite happens work
by default value. So I won't follow it any more.
Thanks
Richard
>
> Best regards
>
> Dirk
>
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