linux-kernel - Re: [PATCH] ARM: SAMSUNG: remove dead #elif CONFIG_S3C24XX

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Message-ID: <1645416.VNQj8YWB7M@phil>
Date:	Thu, 18 Dec 2014 20:03:58 +0100
From:	Heiko Stübner <heiko@...ech.de>
To:	Stefan Hengelein <stefan.hengelein@....de>
Cc:	Arnd Bergmann <arnd@...db.de>,
	linux-arm-kernel@...ts.infradead.org, kgene@...nel.org,
	linux-samsung-soc@...r.kernel.org, linux@....linux.org.uk,
	linux-kernel@...r.kernel.org,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH] ARM: SAMSUNG: remove dead #elif CONFIG_S3C24XX_DMAC

Hi Stefan,

Am Donnerstag, 18. Dezember 2014, 14:43:01 schrieb Stefan Hengelein:
> So you actually tested the code I removed in the patch? can you
> provide a configuration that compiles that piece of code?

Yep, one of my boards (Asus eeeReader DR-900) was actually able to transmit
stuff via the libertas spi wifi driver using the s3c64xx-spi driver.

The smdk2416 is currently the only board for the s3c2416 in the kernel. I don't
know if it had actual spi devices connected, but if it had, a suitable diff would
look something like the diff below. Of course hooking up spi devices would
work the same in any out-of-tree board for the supported socs.


For people reading along, the s3c24xx spi distribution is as follows:
s3c2410, s3c2412, s3c2440: (I think) two s3c24xx-spi
s3c2443: one s3c64xx-spi and one s3c24xx-spi
s3c2416: one s3c64xx-spi
s3c2450: two s3c64xx-spi


Heiko


------------ 8< ------------
diff --git a/arch/arm/mach-s3c24xx/Kconfig b/arch/arm/mach-s3c24xx/Kconfig
index 9eb2229..5210e5d 100644
--- a/arch/arm/mach-s3c24xx/Kconfig
+++ b/arch/arm/mach-s3c24xx/Kconfig
@@ -419,6 +419,8 @@ config MACH_SMDK2416
 	select S3C_DEV_HSMMC1
 	select S3C_DEV_NAND
 	select S3C_DEV_USB_HOST
+	select S3C64XX_DEV_SPI0
+	select S3C2443_SETUP_SPI
 	help
 	  Say Y here if you are using an SMDK2416
 
diff --git a/arch/arm/mach-s3c24xx/mach-smdk2416.c b/arch/arm/mach-s3c24xx/mach-smdk2416.c
index 86394f7..b6c6ff4 100644
--- a/arch/arm/mach-s3c24xx/mach-smdk2416.c
+++ b/arch/arm/mach-s3c24xx/mach-smdk2416.c
@@ -52,6 +52,9 @@
 #include <linux/platform_data/s3c-hsudc.h>
 #include <plat/samsung-time.h>
 
+#include <linux/spi/spi.h>
+#include <linux/platform_data/spi-s3c64xx.h>
+
 #include <plat/fb.h>
 
 #include "common.h"
@@ -207,6 +210,26 @@ static struct s3c_sdhci_platdata smdk2416_hsmmc1_pdata __initdata = {
 	.cd_type		= S3C_SDHCI_CD_NONE,
 };
 
+struct s3c64xx_spi_csinfo libertas_cs_info = {
+	.fb_delay = 0,
+	.line = 128, /* gpio cs line */
+};
+
+
+static struct spi_board_info spi_board_info[] = {
+    {
+	.modalias		= "libertas_spi",
+	.max_speed_hz		= 1200000,
+	.bus_num		= 0,
+	.irq			= 12, /* some interrupt number */
+	.chip_select		= 0,
+	.mode			= SPI_MODE_3,
+	.controller_data	= &libertas_cs_info,
+/*	.platform_data		= &foo1_pdata, */
+    },
+};
+
+
 static struct platform_device *smdk2416_devices[] __initdata = {
 	&s3c_device_fb,
 	&s3c_device_wdt,
@@ -216,6 +239,7 @@ static struct platform_device *smdk2416_devices[] __initdata = {
 	&s3c_device_hsmmc1,
 	&s3c_device_usb_hsudc,
 	&s3c2443_device_dma,
+	&s3c64xx_device_spi0,
 };
 
 static void __init smdk2416_init_time(void)
@@ -250,6 +274,9 @@ static void __init smdk2416_machine_init(void)
 	gpio_request(S3C2410_GPB(1), "Display Reset");
 	gpio_direction_output(S3C2410_GPB(1), 1);
 
+	s3c64xx_spi0_set_platdata(NULL, 0, ARRAY_SIZE(spi_board_info));
+	spi_register_board_info(spi_board_info, ARRAY_SIZE(spi_board_info));
+
 	platform_add_devices(smdk2416_devices, ARRAY_SIZE(smdk2416_devices));
 	smdk_machine_init();
 }
diff --git a/arch/arm/mach-s3c24xx/setup-spi.c b/arch/arm/mach-s3c24xx/setup-spi.c
index 3d47e02..d66c4e0 100644
--- a/arch/arm/mach-s3c24xx/setup-spi.c
+++ b/arch/arm/mach-s3c24xx/setup-spi.c
@@ -16,6 +16,7 @@
 
 #include <mach/hardware.h>
 #include <mach/regs-gpio.h>
+#include <mach/gpio-samsung.h>
 
 #ifdef CONFIG_S3C64XX_DEV_SPI0
 int s3c64xx_spi0_cfg_gpio(void)

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