linux-kernel - [RFC v1 3/3] mtd: m25p80: add get Flash size callback support

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Date:   Mon, 29 Jul 2019 17:25:04 +0300
From:   Tomer Maimon <tmaimon77@...il.com>
To:     broonie@...nel.org, dwmw2@...radead.org,
        computersforpeace@...il.com, marek.vasut@...il.com,
        miquel.raynal@...tlin.com, richard@....at, vigneshr@...com,
        bbrezillon@...nel.org, yogeshnarayan.gaur@....com,
        tudor.ambarus@...rochip.com, gregkh@...uxfoundation.org,
        frieder.schrempf@...eet.de, tglx@...utronix.de
Cc:     linux-spi@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Tomer Maimon <tmaimon77@...il.com>
Subject: [RFC v1 3/3] mtd: m25p80: add get Flash size callback support

Add get Flash size function support for
passing Flash size through callback use
to the spi layer.

Add get Flash size function support

Signed-off-by: Tomer Maimon <tmaimon77@...il.com>
---
 drivers/mtd/devices/m25p80.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index c50888670250..fd14c8c6d8d8 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -151,6 +151,15 @@ static ssize_t m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
 	return len;
 }
 
+/* Sending Flash size thourgh callback function to spi layer */
+size_t	m25p80_get_flash_size(void *param)
+{
+	struct spi_mem *spimem = param;
+	struct m25p *flash = spi_mem_get_drvdata(spimem);
+
+	return (u32)(flash->spi_nor.mtd.size >> 10) * 1024;
+}
+
 /*
  * board specific setup should have ensured the SPI clock used here
  * matches what the READ command supports, at least until this driver
@@ -188,6 +197,9 @@ static int m25p_probe(struct spi_mem *spimem)
 	spi_nor_set_flash_node(nor, spi->dev.of_node);
 	nor->priv = flash;
 
+	spimem->callback = m25p80_get_flash_size;
+	spimem->callback_param = spimem;
+
 	spi_mem_set_drvdata(spimem, flash);
 	flash->spimem = spimem;
 
-- 
2.18.0