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Date: Fri, 9 Aug 2013 10:37:12 -0500
From: Kumar Gala <galak@...eaurora.org>
To: Laxman Dewangan <ldewangan@...dia.com>
Cc: <akpm@...ux-foundation.org>, <grant.likely@...aro.org>,
<rob.herring@...xeda.com>, <rob@...dley.net>,
<devicetree@...r.kernel.org>, <linux-doc@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <rtc-linux@...glegroups.com>,
<gg@...mlogic.co.uk>, <kishon@...com>, <swarren@...dia.com>,
<pawel.moll@....com>, <Mark.Rutland@....com>,
<ian.campbell@...rix.com>, <broonie@...nel.org>
Subject: Re: [PATCH] drivers/rtc/rtc-palmas.c: rename charging dt property name
On Aug 9, 2013, at 10:47 AM, Laxman Dewangan wrote:
> Renaming the charging property names to have more meaningful:
>
> Renaming property "ti,back-battery-charge-enable" to "ti,backup-battery-chargeable"
> to tells OS that attahced battery is chargeable and OS can do charging.
>
> Renaming property "ti,back-battery-charge-low-current" to
> "ti,backup-battery-charge-high-current" for safe configuration as maximum charging current
> of battery depends on battery type and overcurrent charging can damage the battery. So
> enable the high current charging only if this property is available.
>
> Signed-off-by: Laxman Dewangan <ldewangan@...dia.com>
> ---
> The patch V4 version of the change
> [PATCH V4] drivers/rtc/rtc-palmas.c: support for backup battery charging
> is already applied but still the discussion is going on the property name.
>
> To correct the property name, I am sending this patch on top of above patch
> as per discussion on above patch.
>
> .../devicetree/bindings/rtc/rtc-palmas.txt | 21 +++++++++++--------
> drivers/rtc/rtc-palmas.c | 14 ++++++------
> 2 files changed, 19 insertions(+), 16 deletions(-)
Are you not concerned about any dts with the old property names being around such that the code should support the old name as well?
- k
>
> diff --git a/Documentation/devicetree/bindings/rtc/rtc-palmas.txt b/Documentation/devicetree/bindings/rtc/rtc-palmas.txt
> index 41bb445..8ef7660 100644
> --- a/Documentation/devicetree/bindings/rtc/rtc-palmas.txt
> +++ b/Documentation/devicetree/bindings/rtc/rtc-palmas.txt
> @@ -7,13 +7,16 @@ Required properties:
> - interrupts: Interrupt number of RTC submodule on device.
>
> Optional properties:
> -- ti,back-battery-charge-enable: The Palmas series device like TPS65913 or
> - TPS80036 supports the battery backup for powering the RTC when main
> - battery is removed or in very low power state. This flag will enable
> - the backup battery charging.
> -- ti,back-battery-charge-low-current: Configure lower charging current. Device
> - supports the charging current as < 100mA or >100mA. Low current will
> - set as <100mA.
> +- ti,backup-battery-chargeable: The Palmas series device like TPS65913 or
> + TPS80036 supports the backup battery for powering the RTC when main
> + battery is removed or in very low power state. The backup battery
> + can be chargeable or non-chargeable. This flag will tells whether
> + battery is chargeable or not. If charging battery then driver can
> + enable the charging.
> +- ti,backup-battery-charge-high-current: Enable high current charging in
> + backup battery. Device supports the < 100mA and > 100mA charging.
> + The high current will be > 100mA. Absence of this property will
> + charge battery to lower current i.e. < 100mA.
>
> Example:
> palmas: tps65913@58 {
> @@ -22,8 +25,8 @@ Example:
> compatible = "ti,palmas-rtc";
> interrupt-parent = <&palmas>;
> interrupts = <8 0>;
> - ti,back-battery-charge-enable;
> - ti,back-battery-charge-low-current;
> + ti,backup-battery-chargeable;
> + ti,backup-battery-charge-high-current;
> };
> ...
> };
> diff --git a/drivers/rtc/rtc-palmas.c b/drivers/rtc/rtc-palmas.c
> index adb6e71..fffb7d3 100644
> --- a/drivers/rtc/rtc-palmas.c
> +++ b/drivers/rtc/rtc-palmas.c
> @@ -239,13 +239,13 @@ static int palmas_rtc_probe(struct platform_device *pdev)
> struct palmas_rtc *palmas_rtc = NULL;
> int ret;
> bool enable_bb_charging = false;
> - bool low_bb_charging;
> + bool high_bb_charging;
>
> if (pdev->dev.of_node) {
> enable_bb_charging = of_property_read_bool(pdev->dev.of_node,
> - "ti,back-battery-charge-enable");
> - low_bb_charging = of_property_read_bool(pdev->dev.of_node,
> - "ti,back-battery-charge-low-current");
> + "ti,backup-battery-chargeable");
> + high_bb_charging = of_property_read_bool(pdev->dev.of_node,
> + "ti,backup-battery-charge-high-current");
> }
>
> palmas_rtc = devm_kzalloc(&pdev->dev, sizeof(struct palmas_rtc),
> @@ -264,10 +264,10 @@ static int palmas_rtc_probe(struct platform_device *pdev)
> platform_set_drvdata(pdev, palmas_rtc);
>
> if (enable_bb_charging) {
> - unsigned reg = 0;
> + unsigned reg = PALMAS_BACKUP_BATTERY_CTRL_BBS_BBC_LOW_ICHRG;
>
> - if (low_bb_charging)
> - reg |= PALMAS_BACKUP_BATTERY_CTRL_BBS_BBC_LOW_ICHRG;
> + if (high_bb_charging)
> + reg = 0;
>
> ret = palmas_update_bits(palmas, PALMAS_PMU_CONTROL_BASE,
> PALMAS_BACKUP_BATTERY_CTRL,
> --
> 1.7.1.1
>
> --
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