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Date: Tue, 11 Jan 2011 17:04:42 -0700
From: Grant Likely <grant.likely@...retlab.ca>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: linux-kernel@...r.kernel.org,
Alessandro Zummo <a.zummo@...ertech.it>,
rtc-linux@...glegroups.com, x86@...nel.org,
sodaville@...utronix.de, devicetree-discuss@...ts.ozlabs.org
Subject: Re: [PATCH 14/15] rtc/cmos: add OF bindings
On Fri, Dec 17, 2010 at 04:33:52PM +0100, Sebastian Andrzej Siewior wrote:
> This allows to load the OF driver based informations from the device
> tree. Systems without BIOS may need to perform some initialization.
> PowerPC creates a PNP device from the OF information and performs this
> kind of initialization in their private PCI quirk. This looks more
> generic.
>
> Cc: rtc-linux@...glegroups.com
> Cc: Alessandro Zummo <a.zummo@...ertech.it>
> Cc: devicetree-discuss@...ts.ozlabs.org
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> Signed-off-by: Dirk Brandewie <dirk.brandewie@...il.com>
> ---
> Documentation/powerpc/dts-bindings/rtc-cmos.txt | 28 ++++++++++++++++
> drivers/rtc/rtc-cmos.c | 40 +++++++++++++++++++++++
> 2 files changed, 68 insertions(+), 0 deletions(-)
> create mode 100644 Documentation/powerpc/dts-bindings/rtc-cmos.txt
>
> diff --git a/Documentation/powerpc/dts-bindings/rtc-cmos.txt b/Documentation/powerpc/dts-bindings/rtc-cmos.txt
> new file mode 100644
> index 0000000..7382989
> --- /dev/null
> +++ b/Documentation/powerpc/dts-bindings/rtc-cmos.txt
> @@ -0,0 +1,28 @@
> + Motorola mc146818 compatible RTC
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +
> +Required properties:
> + - compatible : "motorola,mc146818"
> + - reg : should contain registers location and length.
> +
> +Optional properties:
> + - interrupts : should contain interrupt.
> + - interrupt-parent : interrupt source phandle.
> + - ctrl-reg : Contains the initial value of the control register also
> + called "Register B".
> + - freq-reg : Contains the initial value of the frequency register also
> + called "Regsiter A".
> +
> +"Register A" and "B" are usually initialized by the firmware (BIOS for
> +instance). If this is not done, it can be performed by the driver.
> +
> +ISA Example:
> +
> + rtc@70 {
> + compatible = "motorola,mc146818";
> + interrupts = <8 3>;
> + interrupt-parent = <&ioapic1>;
> + ctrl-reg = <2>;
> + freq-reg = <0x26>;
> + reg = <1 0x70 2>;
> + };
> diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
> index 5856167..8cf0049 100644
> --- a/drivers/rtc/rtc-cmos.c
> +++ b/drivers/rtc/rtc-cmos.c
> @@ -36,6 +36,8 @@
> #include <linux/platform_device.h>
> #include <linux/mod_devicetable.h>
> #include <linux/log2.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
>
> /* this is for "generic access to PC-style RTC" using CMOS_READ/CMOS_WRITE */
> #include <asm-generic/rtc.h>
> @@ -1121,6 +1123,15 @@ static struct pnp_driver cmos_pnp_driver = {
>
> #endif /* CONFIG_PNP */
>
> +#ifdef CONFIG_OF
> +static const struct of_device_id of_cmos_match[] = {
> + {
> + .compatible = "motorola,mc146818",
> + },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, of_cmos_match);
> +#endif
> /*----------------------------------------------------------------*/
>
> /* Platform setup should have set up an RTC device, when PNP is
> @@ -1129,6 +1140,32 @@ static struct pnp_driver cmos_pnp_driver = {
>
> static int __init cmos_platform_probe(struct platform_device *pdev)
> {
> +#ifdef CONFIG_OF
> + if (pdev->dev.of_node) {
> + struct device_node *node = pdev->dev.of_node;
> + struct rtc_time time;
> + int ret;
> + const __be32 *val;
> +
> + val = of_get_property(node, "ctrl-reg", NULL);
> + if (val)
> + CMOS_WRITE(be32_to_cpup(val), RTC_CONTROL);
> +
> + val = of_get_property(node, "freq-reg", NULL);
> + if (val)
> + CMOS_WRITE(be32_to_cpup(val), RTC_FREQ_SELECT);
> +
> + get_rtc_time(&time);
> + ret = rtc_valid_tm(&time);
> + if (ret) {
> + struct rtc_time def_time = {
> + .tm_year = 1,
> + .tm_mday = 1,
> + };
> + set_rtc_time(&def_time);
> + }
> + }
> +#endif
It's usually cleaner to break the of-specific probe stuff into a
separate function that can be #ifdef'ed out as a whole instead of
having #ifdef blocks inside the probe functions. Aside from that this
patch looks good to me.
> cmos_wake_setup(&pdev->dev);
> return cmos_do_probe(&pdev->dev,
> platform_get_resource(pdev, IORESOURCE_IO, 0),
> @@ -1157,6 +1194,9 @@ static struct platform_driver cmos_platform_driver = {
> .shutdown = cmos_platform_shutdown,
> .driver = {
> .name = (char *) driver_name,
> +#if defined(CONFIG_OF)
> + .of_match_table = of_cmos_match,
> +#endif
> .suspend = cmos_suspend,
> .resume = cmos_resume,
> }
> --
> 1.7.3.2
>
> _______________________________________________
> devicetree-discuss mailing list
> devicetree-discuss@...ts.ozlabs.org
> https://lists.ozlabs.org/listinfo/devicetree-discuss
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