linux-kernel - Re: [PATCH 08/15] rtc: sun6i: Expose internal oscillator through device tree

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Date:   Wed, 28 Nov 2018 11:33:02 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-rtc@...r.kernel.org,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH 08/15] rtc: sun6i: Expose internal oscillator through
 device tree

65;5402;1c
On Wed, Nov 28, 2018 at 05:30:06PM +0800, Chen-Yu Tsai wrote:
> The bindings have been updated to expose the RTC's internal oscillator,
> for some SoCs that have it directly feeding the PRCM block. The changes
> include the index 2 for the clock outputs, as well as the clock output
> names.
> 
> This patch adds the internal oscillator to the list of clocks exposed
> through of_clk_add_hw_provider(), and also have the driver optionally
> fetch the name of the clock from the device tree if it's available.
> 
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> ---
>  drivers/rtc/rtc-sun6i.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/rtc/rtc-sun6i.c b/drivers/rtc/rtc-sun6i.c
> index 62ed9ce53d8c..273ab7fbbbe3 100644
> --- a/drivers/rtc/rtc-sun6i.c
> +++ b/drivers/rtc/rtc-sun6i.c
> @@ -220,6 +220,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
>  		.ops		= &sun6i_rtc_osc_ops,
>  		.name		= "losc",
>  	};
> +	const char *iosc_name = "rtc-int-osc";
>  	const char *clkout_name = "osc32k-out";
>  	const char *parents[2];
>  
> @@ -228,7 +229,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
>  		return;
>  
>  	rtc->data = data;
> -	clk_data = kzalloc(struct_size(clk_data, hws, 2), GFP_KERNEL);
> +	clk_data = kzalloc(struct_size(clk_data, hws, 3), GFP_KERNEL);
>  	if (!clk_data) {
>  		kfree(rtc);
>  		return;
> @@ -253,8 +254,10 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
>  	if (!of_get_property(node, "clocks", NULL))
>  		goto err;
>  
> +	of_property_read_string_index(node, "clock-output-names", 2,
> +				      &iosc_name);
>  	rtc->int_osc = clk_hw_register_fixed_rate_with_accuracy(NULL,
> -								"rtc-int-osc",
> +								iosc_name,
>  								NULL, 0,
>  								rtc->data->rc_osc_rate,
>  								300000000);
> @@ -290,9 +293,10 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
>  		return;
>  	}
>  
> -	clk_data->num = 2;
> +	clk_data->num = 3;
>  	clk_data->hws[0] = &rtc->hw;
>  	clk_data->hws[1] = __clk_get_hw(rtc->ext_losc);
> +	clk_data->hws[2] = rtc->int_osc;

Shouldn't we add a check on either the compatible on the number of
clock-output-names?

Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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