linux-kernel - Re: [PATCH] nvmem: bcm-ocotp: Add ACPI support to BCM OCOTP

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Date:   Mon, 31 Dec 2018 14:44:15 -0800
From:   Scott Branden <scott.branden@...adcom.com>
To:     Srinath Mannam <srinath.mannam@...adcom.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Ray Jui <rjui@...adcom.com>
Cc:     bcm-kernel-feedback-list@...adcom.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nvmem: bcm-ocotp: Add ACPI support to BCM OCOTP


On 2018-12-26 7:39 p.m., Srinath Mannam wrote:
> Add ACPI support to bcm ocotp driver
>
> This patch is based on Linux-4.20-rc7.
>
> Signed-off-by: Srinath Mannam <srinath.mannam@...adcom.com>
Acked-by: Scott Branden <scott.branden@...adcom.com>
> ---
>   drivers/nvmem/bcm-ocotp.c | 37 ++++++++++++++++++++-----------------
>   1 file changed, 20 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/nvmem/bcm-ocotp.c b/drivers/nvmem/bcm-ocotp.c
> index 4159b3f..a809751 100644
> --- a/drivers/nvmem/bcm-ocotp.c
> +++ b/drivers/nvmem/bcm-ocotp.c
> @@ -11,13 +11,14 @@
>    * GNU General Public License for more details.
>    */
>   
> +#include <linux/acpi.h>
>   #include <linux/delay.h>
>   #include <linux/device.h>
>   #include <linux/io.h>
>   #include <linux/module.h>
>   #include <linux/nvmem-provider.h>
>   #include <linux/of.h>
> -#include <linux/of_address.h>
> +#include <linux/of_device.h>
>   #include <linux/platform_device.h>
>   
>   /*
> @@ -78,9 +79,9 @@ static struct otpc_map otp_map_v2 = {
>   };
>   
>   struct otpc_priv {
> -	struct device       *dev;
> -	void __iomem        *base;
> -	struct otpc_map     *map;
> +	struct device *dev;
> +	void __iomem *base;
> +	const struct otpc_map *map;
>   	struct nvmem_config *config;
>   };
>   
> @@ -237,16 +238,22 @@ static struct nvmem_config bcm_otpc_nvmem_config = {
>   };
>   
>   static const struct of_device_id bcm_otpc_dt_ids[] = {
> -	{ .compatible = "brcm,ocotp" },
> -	{ .compatible = "brcm,ocotp-v2" },
> +	{ .compatible = "brcm,ocotp", .data = &otp_map },
> +	{ .compatible = "brcm,ocotp-v2", .data = &otp_map_v2 },
>   	{ },
>   };
>   MODULE_DEVICE_TABLE(of, bcm_otpc_dt_ids);
>   
> +static const struct acpi_device_id bcm_otpc_acpi_ids[] = {
> +	{ .id = "BRCM0700", .driver_data = (kernel_ulong_t)&otp_map },
> +	{ .id = "BRCM0701", .driver_data = (kernel_ulong_t)&otp_map_v2 },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(acpi, bcm_otpc_acpi_ids);
> +
>   static int bcm_otpc_probe(struct platform_device *pdev)
>   {
>   	struct device *dev = &pdev->dev;
> -	struct device_node *dn = dev->of_node;
>   	struct resource *res;
>   	struct otpc_priv *priv;
>   	struct nvmem_device *nvmem;
> @@ -257,14 +264,9 @@ static int bcm_otpc_probe(struct platform_device *pdev)
>   	if (!priv)
>   		return -ENOMEM;
>   
> -	if (of_device_is_compatible(dev->of_node, "brcm,ocotp"))
> -		priv->map = &otp_map;
> -	else if (of_device_is_compatible(dev->of_node, "brcm,ocotp-v2"))
> -		priv->map = &otp_map_v2;
> -	else {
> -		dev_err(dev, "%s otpc config map not defined\n", __func__);
> -		return -EINVAL;
> -	}
> +	priv->map = device_get_match_data(dev);
> +	if (!priv->map)
> +		return -ENODEV;
>   
>   	/* Get OTP base address register. */
>   	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> @@ -281,7 +283,7 @@ static int bcm_otpc_probe(struct platform_device *pdev)
>   	reset_start_bit(priv->base);
>   
>   	/* Read size of memory in words. */
> -	err = of_property_read_u32(dn, "brcm,ocotp-size", &num_words);
> +	err = device_property_read_u32(dev, "brcm,ocotp-size", &num_words);
>   	if (err) {
>   		dev_err(dev, "size parameter not specified\n");
>   		return -EINVAL;
> @@ -294,7 +296,7 @@ static int bcm_otpc_probe(struct platform_device *pdev)
>   	bcm_otpc_nvmem_config.dev = dev;
>   	bcm_otpc_nvmem_config.priv = priv;
>   
> -	if (of_device_is_compatible(dev->of_node, "brcm,ocotp-v2")) {
> +	if (priv->map == &otp_map_v2) {
>   		bcm_otpc_nvmem_config.word_size = 8;
>   		bcm_otpc_nvmem_config.stride = 8;
>   	}
> @@ -315,6 +317,7 @@ static struct platform_driver bcm_otpc_driver = {
>   	.driver = {
>   		.name	= "brcm-otpc",
>   		.of_match_table = bcm_otpc_dt_ids,
> +		.acpi_match_table = ACPI_PTR(bcm_otpc_acpi_ids),
>   	},
>   };
>   module_platform_driver(bcm_otpc_driver);