linux-kernel - Re: [PATCH v3 1/3] nvmem: Update the OF binding to use a subnode for the cells list

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Date:   Thu, 7 Jun 2018 18:03:16 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Alban <albeu@...e.fr>
Cc:     linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        devicetree@...r.kernel.org, linux-mtd@...ts.infradead.org
Subject: Re: [PATCH v3 1/3] nvmem: Update the OF binding to use a subnode for
 the cells list



On 07/06/18 17:41, Alban wrote:
> AFAIU the only thing that we disagree on now is if the nodes
> representing the cells should be direct children of the provider
> or in a dedicated subnode. For the MTD case both solution would solve
> the binding clash. I would really appreciate if the DT people could
Am reluctant in changing the nvmem generic bindings for a special case.

Can you try this with your original subnode proposal:
just pass the subnode node pointer in np of nvmem_config:

------------------------->cut<------------------------------------
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index b05aa8e81303..c9621632bbfb 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -472,7 +472,11 @@ struct nvmem_device *nvmem_register(const struct 
nvmem_config *config)
         nvmem->priv = config->priv;
         nvmem->reg_read = config->reg_read;
         nvmem->reg_write = config->reg_write;
-       nvmem->dev.of_node = config->dev->of_node;
+
+       if (config->np)
+               nvmem->dev.of_node = config->np;
+       else
+               nvmem->dev.of_node = config->dev->of_node;

         if (config->id == -1 && config->name) {
                 dev_set_name(&nvmem->dev, "%s", config->name);
diff --git a/include/linux/nvmem-provider.h b/include/linux/nvmem-provider.h
index f89598bc4e1c..743345ffe2c8 100644
--- a/include/linux/nvmem-provider.h
+++ b/include/linux/nvmem-provider.h
@@ -49,6 +49,7 @@ typedef int (*nvmem_reg_write_t)(void *priv, unsigned 
int offset,
   */
  struct nvmem_config {
         struct device           *dev;
+       struct device_node      *np;
         const char              *name;
         int                     id;
         struct module           *owner;

------------------------->cut<------------------------------------

thanks,
srini

> chip in so that we can settle this and get the MTD support merged.