linux-kernel - Re: [PATCH 1/1] clk: bulk: add of_clk_bulk

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Date:   Mon, 11 Sep 2017 10:58:19 +0200
From:   Sylwester Nawrocki <s.nawrocki@...sung.com>
To:     Dong Aisheng <aisheng.dong@....com>, linux-clk@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        sboyd@...eaurora.org, mturquette@...libre.com, shawnguo@...nel.org,
        Russell King <linux@....linux.org.uk>
Subject: Re: [PATCH 1/1] clk: bulk: add of_clk_bulk_get()

On 09/11/2017 09:36 AM, Dong Aisheng wrote:
> 'clock-names' property is optinal in DT, so of_clk_bulk_get() is introduced
> here to handle this for DT users without 'clock-names' specified.
> 
> Cc: Stephen Boyd <sboyd@...eaurora.org>
> Cc: Michael Turquette <mturquette@...libre.com>
> Cc: Russell King <linux@....linux.org.uk>
> Reported-by: Shawn Guo <shawnguo@...nel.org>
> Signed-off-by: Dong Aisheng <aisheng.dong@....com>
> ---
>   drivers/clk/clk-bulk.c | 31 +++++++++++++++++++++++++++++++
>   include/linux/clk.h    |  8 ++++++++
>   2 files changed, 39 insertions(+)
> 
> diff --git a/drivers/clk/clk-bulk.c b/drivers/clk/clk-bulk.c
> index c834f5a..3179f28 100644
> --- a/drivers/clk/clk-bulk.c
> +++ b/drivers/clk/clk-bulk.c
> @@ -19,6 +19,37 @@
>   #include <linux/clk.h>
>   #include <linux/device.h>
>   #include <linux/export.h>
> +#include <linux/of.h>
> +
> +#if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)
> +int __must_check of_clk_bulk_get(struct device_node *np, int num_clks,
> +				 struct clk_bulk_data *clks)
> +{
> +	int ret;
> +	int i;
> +
> +	for (i = 0; i < num_clks; i++)
> +		clks[i].clk = NULL;
> +
> +	for (i = 0; i < num_clks; i++) {
> +		clks[i].clk = of_clk_get(np, i);
> +		if (IS_ERR(clks[i].clk)) {
> +			ret = PTR_ERR(clks[i].clk);

> +			pr_err("%s: Failed to get clk index: %d ret: %d\n",
> +			       np->full_name, i, ret);

AFAIU full_node is not supposed now to be dereferenced directly,
since storing of the full path string for each node is going to be
removed. %pOF needs to be used instead, e.g.

	pr_err("%pOF: failed to get clk %d: %d\n", np, i , ret);

> +			clks[i].clk = NULL;
> +			goto err;
> +		}
> +	}
> +
> +	return 0;
> +
> +err:
> +	clk_bulk_put(i, clks);
> +
> +	return ret;
> +}
> +#endif

-- 
Regards,
Sylwester