Re: [PATCH v7 2/4] Power: Reset: Generalize qnap-poweroff to work on Synology devices.

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On Fri, Feb 21, 2014 at 08:39:54PM -0500, Jason Cooper wrote:
> Dmitry, David,
> 
> On Thu, Feb 20, 2014 at 06:02:35AM +1000, klightspeed@xxxxxxxxxxxxxxxx wrote:
> > From: Andrew Lunn <andrew@xxxxxxx>
> > 
> > The Synology NAS devices use a very similar mechanism to QNAP NAS
> > devices to power off. Both send a single charactor command to a PIC,
> > over the second serial port. However the baud rate and the command
> > differ. Generalize the driver to support this.
> > 
> > Signed-off-by: Ben Peddell <klightspeed@xxxxxxxxxxxxxxxx>
> > Signed-off-by: Andrew Lunn <andrew@xxxxxxx>
> > Acked-by: Jason Cooper <jason@xxxxxxxxxxxxxx>
> > Cc: Anton Vorontsov <anton@xxxxxxxxxx>
> > Cc: Dmitry Eremin-Solenikov <dbaryshkov@xxxxxxxxx>
> > Cc: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
> > ---
> >  .../bindings/power_supply/qnap-poweroff.txt        |  5 ++-
> >  drivers/power/reset/qnap-poweroff.c                | 49 ++++++++++++++++------
> >  2 files changed, 41 insertions(+), 13 deletions(-)
> 
> Do you guys want to take this, or me?  I'm fine either way, there's no
> dependencies.

Hmmm, it's been over a week.  Since it's isolated to a driver only
kirkwood/mvebu devices use, I'll go ahead a queue this up to go through
mvebu/arm-soc for v3.15.  Please ping me in the next few days if you'd
prefer I drop it.

Applied to mvebu/drivers

thx,

Jason.

> > diff --git a/Documentation/devicetree/bindings/power_supply/qnap-poweroff.txt b/Documentation/devicetree/bindings/power_supply/qnap-poweroff.txt
> > index 0347d83..af25e77 100644
> > --- a/Documentation/devicetree/bindings/power_supply/qnap-poweroff.txt
> > +++ b/Documentation/devicetree/bindings/power_supply/qnap-poweroff.txt
> > @@ -6,8 +6,11 @@ Orion5x SoCs. Sending the character 'A', at 19200 baud, tells the
> >  microcontroller to turn the power off. This driver adds a handler to
> >  pm_power_off which is called to turn the power off.
> >  
> > +Synology NAS devices use a similar scheme, but a different baud rate,
> > +9600, and a different character, '1'.
> > +
> >  Required Properties:
> > -- compatible: Should be "qnap,power-off"
> > +- compatible: Should be "qnap,power-off" or "synology,power-off"
> >  
> >  - reg: Address and length of the register set for UART1
> >  - clocks: tclk clock
> > diff --git a/drivers/power/reset/qnap-poweroff.c b/drivers/power/reset/qnap-poweroff.c
> > index 37f56f7..a75db7f 100644
> > --- a/drivers/power/reset/qnap-poweroff.c
> > +++ b/drivers/power/reset/qnap-poweroff.c
> > @@ -1,5 +1,5 @@
> >  /*
> > - * QNAP Turbo NAS Board power off
> > + * QNAP Turbo NAS Board power off. Can also be used on Synology devices.
> >   *
> >   * Copyright (C) 2012 Andrew Lunn <andrew@xxxxxxx>
> >   *
> > @@ -25,17 +25,43 @@
> >  
> >  #define UART1_REG(x)	(base + ((UART_##x) << 2))
> >  
> > +struct power_off_cfg {
> > +	u32 baud;
> > +	char cmd;
> > +};
> > +
> > +static const struct power_off_cfg qnap_power_off_cfg = {
> > +	.baud = 19200,
> > +	.cmd = 'A',
> > +};
> > +
> > +static const struct power_off_cfg synology_power_off_cfg = {
> > +	.baud = 9600,
> > +	.cmd = '1',
> > +};
> > +
> > +static const struct of_device_id qnap_power_off_of_match_table[] = {
> > +	{ .compatible = "qnap,power-off",
> > +	  .data = &qnap_power_off_cfg,
> > +	},
> > +	{ .compatible = "synology,power-off",
> > +	  .data = &synology_power_off_cfg,
> > +	},
> > +	{}
> > +};
> > +MODULE_DEVICE_TABLE(of, qnap_power_off_of_match_table);
> > +
> >  static void __iomem *base;
> >  static unsigned long tclk;
> > +static const struct power_off_cfg *cfg;
> >  
> >  static void qnap_power_off(void)
> >  {
> > -	/* 19200 baud divisor */
> > -	const unsigned divisor = ((tclk + (8 * 19200)) / (16 * 19200));
> > +	const unsigned divisor = ((tclk + (8 * cfg->baud)) / (16 * cfg->baud));
> >  
> >  	pr_err("%s: triggering power-off...\n", __func__);
> >  
> > -	/* hijack UART1 and reset into sane state (19200,8n1) */
> > +	/* hijack UART1 and reset into sane state */
> >  	writel(0x83, UART1_REG(LCR));
> >  	writel(divisor & 0xff, UART1_REG(DLL));
> >  	writel((divisor >> 8) & 0xff, UART1_REG(DLM));
> > @@ -44,16 +70,21 @@ static void qnap_power_off(void)
> >  	writel(0x00, UART1_REG(FCR));
> >  	writel(0x00, UART1_REG(MCR));
> >  
> > -	/* send the power-off command 'A' to PIC */
> > -	writel('A', UART1_REG(TX));
> > +	/* send the power-off command to PIC */
> > +	writel(cfg->cmd, UART1_REG(TX));
> >  }
> >  
> >  static int qnap_power_off_probe(struct platform_device *pdev)
> >  {
> > +	struct device_node *np = pdev->dev.of_node;
> >  	struct resource *res;
> >  	struct clk *clk;
> >  	char symname[KSYM_NAME_LEN];
> >  
> > +	const struct of_device_id *match =
> > +		of_match_node(qnap_power_off_of_match_table, np);
> > +	cfg = match->data;
> > +
> >  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> >  	if (!res) {
> >  		dev_err(&pdev->dev, "Missing resource");
> > @@ -94,12 +125,6 @@ static int qnap_power_off_remove(struct platform_device *pdev)
> >  	return 0;
> >  }
> >  
> > -static const struct of_device_id qnap_power_off_of_match_table[] = {
> > -	{ .compatible = "qnap,power-off", },
> > -	{}
> > -};
> > -MODULE_DEVICE_TABLE(of, qnap_power_off_of_match_table);
> > -
> >  static struct platform_driver qnap_power_off_driver = {
> >  	.probe	= qnap_power_off_probe,
> >  	.remove	= qnap_power_off_remove,
> > -- 
> > 1.8.3.2
> > 
> > 
> > _______________________________________________
> > linux-arm-kernel mailing list
> > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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