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From: Michael Walle <michael@walle.cc>
To: "Miquel Raynal" <miquel.raynal@bootlin.com>,
	"Richard Weinberger" <richard@nod.at>,
	"Vignesh Raghavendra" <vigneshr@ti.com>,
	"Rob Herring" <robh+dt@kernel.org>,
	"Krzysztof Kozlowski" <krzysztof.kozlowski+dt@linaro.org>,
	"Srinivas Kandagatla" <srinivas.kandagatla@linaro.org>,
	"Shawn Guo" <shawnguo@kernel.org>, "Li Yang" <leoyang.li@nxp.com>,
	"Rafał Miłecki" <rafal@milecki.pl>,
	"Frank Rowand" <frowand.list@gmail.com>
Cc: linux-mtd@lists.infradead.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	Ahmad Fatoum <a.fatoum@pengutronix.de>,
	Philipp Zabel <p.zabel@pengutronix.de>,
	Michael Walle <michael@walle.cc>, Rob Herring <robh@kernel.org>
Subject: [PATCH v2 02/20] of: base: add of_parse_phandle_with_optional_args()
Date: Fri,  2 Sep 2022 00:18:39 +0200	[thread overview]
Message-ID: <20220901221857.2600340-3-michael@walle.cc> (raw)
In-Reply-To: <20220901221857.2600340-1-michael@walle.cc>

Add a new variant of the of_parse_phandle_with_args() which treats the
cells name as optional. If it's missing, it is assumed that the phandle
has no arguments.

Up until now, a nvmem node didn't have any arguments, so all the device
trees haven't any '#*-cells' property. But there is a need for an
additional argument for the phandle, for which we need a '#*-cells'
property. Therefore, we need to support nvmem nodes with and without
this property.

Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Rob Herring <robh@kernel.org>
---
changes since v1:
 - none

 include/linux/of.h | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/include/linux/of.h b/include/linux/of.h
index 766d002bddb9..a0fe1a017452 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -1008,6 +1008,31 @@ static inline int of_parse_phandle_with_fixed_args(const struct device_node *np,
 					    index, out_args);
 }
 
+/**
+ * of_parse_phandle_with_optional_args() - Find a node pointed by phandle in a list
+ * @np:		pointer to a device tree node containing a list
+ * @list_name:	property name that contains a list
+ * @cells_name:	property name that specifies phandles' arguments count
+ * @index:	index of a phandle to parse out
+ * @out_args:	optional pointer to output arguments structure (will be filled)
+ *
+ * Same as of_parse_phandle_with_args() except that if the cells_name property
+ * is not found, cell_count of 0 is assumed.
+ *
+ * This is used to useful, if you have a phandle which didn't have arguments
+ * before and thus doesn't have a '#*-cells' property but is now migrated to
+ * having arguments while retaining backwards compatibility.
+ */
+static inline int of_parse_phandle_with_optional_args(const struct device_node *np,
+						      const char *list_name,
+						      const char *cells_name,
+						      int index,
+						      struct of_phandle_args *out_args)
+{
+	return __of_parse_phandle_with_args(np, list_name, cells_name,
+					    0, index, out_args);
+}
+
 /**
  * of_property_count_u8_elems - Count the number of u8 elements in a property
  *
-- 
2.30.2


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  parent reply	other threads:[~2022-09-01 22:20 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-01 22:18 [PATCH v2 00/20] nvmem: core: introduce NVMEM layouts Michael Walle
2022-09-01 22:18 ` [PATCH v2 01/20] net: add helper eth_addr_add() Michael Walle
2022-09-01 23:22   ` Randy Dunlap
2022-09-02  7:27     ` Michael Walle
2022-09-01 22:18 ` Michael Walle [this message]
2022-09-01 22:18 ` [PATCH v2 03/20] nvmem: core: add an index parameter to the cell Michael Walle
2022-09-09  8:12   ` Srinivas Kandagatla
2022-09-01 22:18 ` [PATCH v2 04/20] nvmem: core: move struct nvmem_cell_info to nvmem-provider.h Michael Walle
2022-09-01 22:18 ` [PATCH v2 05/20] nvmem: core: drop the removal of the cells in nvmem_add_cells() Michael Walle
2022-09-01 22:18 ` [PATCH v2 06/20] nvmem: core: add nvmem_add_one_cell() Michael Walle
2022-09-09  8:52   ` Srinivas Kandagatla
2022-09-01 22:18 ` [PATCH v2 07/20] nvmem: core: use nvmem_add_one_cell() in nvmem_add_cells_from_of() Michael Walle
2022-09-01 22:18 ` [PATCH v2 08/20] nvmem: core: introduce NVMEM layouts Michael Walle
2022-09-01 22:18 ` [PATCH v2 09/20] nvmem: core: add per-cell post processing Michael Walle
2022-09-01 22:18 ` [PATCH v2 10/20] nvmem: core: allow to modify a cell before adding it Michael Walle
2022-09-01 22:18 ` [PATCH v2 11/20] nvmem: imx-ocotp: replace global post processing with layouts Michael Walle
2022-09-07 12:31   ` Michael Walle
2022-09-01 22:18 ` [PATCH v2 12/20] nvmem: cell: drop global cell_post_process Michael Walle
2022-09-01 22:18 ` [PATCH v2 13/20] nvmem: core: drop priv pointer in post process callback Michael Walle
2022-09-09  8:52   ` Srinivas Kandagatla
2022-09-09  8:58     ` Michael Walle
2022-09-09  9:08       ` Srinivas Kandagatla
2022-09-09  9:39         ` Michael Walle
2022-09-01 22:18 ` [PATCH v2 14/20] dt-bindings: mtd: relax the nvmem compatible string Michael Walle
2022-09-08 12:21   ` Krzysztof Kozlowski
2022-09-01 22:18 ` [PATCH v2 15/20] dt-bindings: nvmem: add YAML schema for the sl28 vpd layout Michael Walle
2022-09-08 12:22   ` Krzysztof Kozlowski
2022-09-12 19:20   ` Rob Herring
2022-09-13 14:21     ` Michael Walle
2022-09-22  9:22       ` Miquel Raynal
2022-09-01 22:18 ` [PATCH v2 16/20] nvmem: layouts: add sl28vpd layout Michael Walle
2022-09-01 22:18 ` [PATCH v2 17/20] nvmem: core: export nvmem device size Michael Walle
2022-09-01 22:18 ` [PATCH v2 18/20] arm64: dts: ls1028a: sl28: get MAC addresses from VPD Michael Walle
2022-09-01 22:18 ` [RFC PATCH v2 19/20] nvmem: layouts: rewrite the u-boot-env driver as a NVMEM layout Michael Walle
2022-09-21 10:37   ` Miquel Raynal
2022-09-01 22:18 ` [RFC PATCH v2 20/20] nvmem: layouts: u-boot-env: add device node Michael Walle
2022-09-21  9:58 ` [PATCH v2 00/20] nvmem: core: introduce NVMEM layouts Miquel Raynal
2022-09-22 21:22   ` Srinivas Kandagatla
2022-09-23  8:31     ` Miquel Raynal
2022-09-23 15:47 ` Miquel Raynal
2022-09-23 17:28   ` Michael Walle

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