linux-kernel - Re: [PATCH RESEND] memory: jz4780_nemc: Only request IO memory the driver will use

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Date:   Sat, 25 Jul 2020 14:40:32 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     od@...c.me, 周琰杰 <zhouyanjie@...yeetech.com>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        "H . Nikolaus Schaller" <hns@...delico.com>
Subject: Re: [PATCH RESEND] memory: jz4780_nemc: Only request IO memory the
 driver will use

Thomas, Greg,

Nevermind the previous note, it turns out a new maintainer (Krzysztof) 
just appeared for drivers/memory/, I will upstream this patch through 
him.

Cheers,
-Paul


Le jeu. 23 juil. 2020 à 11:04, Paul Cercueil <paul@...pouillou.net> a 
écrit :
> The driver only uses the registers up to offset 0x54. Since the EFUSE
> registers are in the middle of the NEMC registers, we only request
> the registers we will use for now - that way the EFUSE driver can
> probe too.
> 
> Tested-by: H. Nikolaus Schaller <hns@...delico.com>
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> ---
> 
> Notes:
>     Thomas:
> 
>     drivers/memory/ has no dedicated maintainer, so sending this
>     patch upstream is like sending a bottle to the sea. Since it
>     touches a driver for a Ingenic SoC, if Greg doesn't take it
>     (I don't blame him - he's a busy man), could you take it in
>     your tree?
> 
>     Thanks,
>     -Paul
> 
>  drivers/memory/jz4780-nemc.c | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/memory/jz4780-nemc.c 
> b/drivers/memory/jz4780-nemc.c
> index b232ed279fc3..647267ea8c63 100644
> --- a/drivers/memory/jz4780-nemc.c
> +++ b/drivers/memory/jz4780-nemc.c
> @@ -8,6 +8,7 @@
> 
>  #include <linux/clk.h>
>  #include <linux/init.h>
> +#include <linux/io.h>
>  #include <linux/math64.h>
>  #include <linux/of.h>
>  #include <linux/of_address.h>
> @@ -288,7 +289,19 @@ static int jz4780_nemc_probe(struct 
> platform_device *pdev)
>  	nemc->dev = dev;
> 
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	nemc->base = devm_ioremap_resource(dev, res);
> +
> +	/*
> +	 * The driver only uses the registers up to offset 0x54. Since the 
> EFUSE
> +	 * registers are in the middle of the NEMC registers, we only 
> request
> +	 * the registers we will use for now - that way the EFUSE driver can
> +	 * probe too.
> +	 */
> +	if (!devm_request_mem_region(dev, res->start, 0x54, dev_name(dev))) 
> {
> +		dev_err(dev, "unable to request I/O memory region\n");
> +		return -EBUSY;
> +	}
> +
> +	nemc->base = devm_ioremap(dev, res->start, resource_size(res));
>  	if (IS_ERR(nemc->base)) {
>  		dev_err(dev, "failed to get I/O memory\n");
>  		return PTR_ERR(nemc->base);
> --
> 2.27.0
>