linux-kernel - Re: [PATCH v2 2/9] mtd: rawnand: brcmnand: Allow SoC to provide I/O operations

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Message-ID: <703aeebe-3413-0e5e-80ca-4c0bcd36e3f5@gmail.com>
Date:   Thu, 6 Jan 2022 19:10:12 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     linux-mtd@...ts.infradead.org
Cc:     Rafał Miłecki <zajec5@...il.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Brian Norris <computersforpeace@...il.com>,
        Kamal Dasu <kdasu.kdev@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Cai Huoqing <caihuoqing@...du.com>,
        Colin Ian King <colin.king@...el.com>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:BROADCOM SPECIFIC AMBA DRIVER (BCMA)" 
        <linux-wireless@...r.kernel.org>,
        "open list:BROADCOM STB NAND FLASH DRIVER" 
        <bcm-kernel-feedback-list@...adcom.com>
Subject: Re: [PATCH v2 2/9] mtd: rawnand: brcmnand: Allow SoC to provide I/O
 operations



On 1/6/2022 4:13 PM, Florian Fainelli wrote:
> Allow a brcmnand_soc instance to provide a custom set of I/O operations
> which we will require when using this driver on a BCMA bus which is not
> directly memory mapped I/O. Update the nand_{read,write}_reg accordingly
> to use the SoC operations if provided.
> 
> To minimize the penalty on other SoCs which do support standard MMIO
> accesses, we use a static key which is disabled by default and gets
> enabled if a soc implementation does provide I/O operations.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---

[snip]

>   	init_completion(&ctrl->done);
>   	init_completion(&ctrl->dma_done);
>   	init_completion(&ctrl->edu_done);
> @@ -3145,6 +3169,8 @@ int brcmnand_probe(struct platform_device *pdev, struct brcmnand_soc *soc)
>   		/* Enable interrupt */
>   		ctrl->soc->ctlrdy_ack(ctrl->soc);
>   		ctrl->soc->ctlrdy_set_enabled(ctrl->soc, true);
> +		if (brcmnand_soc_has_ops(soc))
> +			static_branch_enable(&brcmnand_soc_has_ops_key);

This hunk got mistakenly added with a rebase, I will wait for additional 
comments before spinning a new version.
-- 
Florian